Cisco qos management software

cisco qos management software

Cisco IOS software can classify packets and apply the appropriate QoS service before the data is encrypted and tunneled. The QoS for VPN feature. You can view the individual performance statistics based on the QoS configuration type. This section explains how to configure, discover, and. Cisco QoS FAQ: Management Tools and QoS Design · Q1. What do the following acronyms stand for? · Q2. What QoS Management tool is actually a. WORKBENCH FOLD - по АЛП - с пн 21:00, суббота до 18:00. - по АЛП - с пн с 9:00. Жгучая телефонная линия Отдел по работе. Жгучая телефонная пятницу с по работе с Покупателями 8-495-792-36-00 звонок до 18:00 работы:.

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Before configuring standard QoS, you must have a thorough understanding of these items:.

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Cisco qos management software There is no policing of the voice traffic once the call has been established. It is always mac mysql workbench download to allocate to the priority queue slightly more than the known required amount of bandwidth. The bandwidth parameter both guarantees bandwidth to the priority class and restrains the flow of packets from the priority class. The PQ scheme allows delay-sensitive data such as voice to be dequeued and sent before packets in other queues are dequeued. Priority Queues Each port supports eight egress queues, of which two can read article given a priority. If a default class is configured with the bandwidth policy-map class configuration command, all unclassified traffic is put into a single FIFO queue and given treatment according to the configured bandwidth. Step 5.
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Comodo in spanish Packets satisfying the match criteria for a class constitute the traffic for that class. The following example displays the various policing actions that can be associated to the policer. You can also set the following values using the set cos command:. The most common methods include the following:. Summarize the Cisco recommendations for tuning shaping parameters when shaping must be enabled on VCs carrying voice. Command options for policy class map configuration mode include the following: word —Class map name. Classification can also be carried in the Layer 2 frame.
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A derived rate based on the level of congestion. The rate of transfer depends on these three components that constitute the token bucket: burst size, mean rate, and time measurement interval. The mean rate is equal to the burst size divided by the interval. When traffic shaping is enabled, the bit rate of the interface does not exceed the mean rate over any integral multiple of the interval. In other words, during every interval, a maximum of burst size can be sent. Within the interval, however, the bit rate may be faster than the mean rate at any given time.

For ATM Layer 3 subinterfaces, shaping is not supported in the egress direction. VC shaping cannot be configured, removed, or modified on an interface that already has an egress service policy configured. For Ethernet interfaces, this translates to 20 bytes of Layer 1 overhead in addition to the Layer 2 overhead.

In general, traffic policing allows you to control the maximum rate of traffic sent or received on an interface and to partition a network into multiple priority levels or class of service CoS. Traffic policing manages the maximum rate of traffic through a token bucket algorithm. The token bucket algorithm uses user-configured values to determine the maximum rate of traffic allowed on an interface at a given moment in time.

The token bucket algorithm is affected by all traffic entering or leaving the interface depending on where the traffic policy with traffic policing is configured and is useful in managing network bandwidth in cases where several large packets are sent in the same traffic stream. Traffic entering the interface with traffic policing configured is placed into one of these categories.

Within these three categories, users can decide packet treatments. For instance, packets that conform can be configured to be sent, packets that exceed can be configured to be sent with a decreased priority, and packets that violate can be configured to be dropped.

Traffic policing is often configured on interfaces at the edge of a network to limit the rate of traffic entering or leaving the network. In the most common traffic policing configurations, traffic that conforms to the CIR is sent and traffic that exceeds is sent with a decreased priority or is dropped.

Users can change these configuration options to suit their network needs. Configured values take into account the Layer 2 encapsulation applied to traffic. This applies to both ingress and egress policing. For Ethernet, the encapsulation is 14 bytes; whereas for Traffic policing also provides a certain amount of bandwidth management by allowing you to set the burst size Bc for the committed information rate CIR. When the peak information rate PIR is supported, a second token bucket is enforced and then the traffic policer is called a two-rate policer.

This section describes the single-rate mechanism. A single-rate, two-action policer provides one token bucket with two actions for each packet: a conform action and an exceed action. This figure illustrates how a single-rate token bucket policer marks packets as either conforming or exceeding a CIR, and assigns an action. The time interval between token updates Tc to the token bucket is updated at the CIR value each time a packet arrives at the traffic policer.

The Tc token bucket can contain up to the Bc value, which can be a certain number of bytes or a period of time. If a packet of size B is greater than the Tc token bucket, then the packet exceeds the CIR value and a configured action is performed. If a packet of size B is less than the Tc token bucket, then the packet conforms and a different configured action is performed. Police rates can be configured in the range of 8 Kbps - Gbps.

Smallest granularity supported is 8 kbps for rates up to 8 Mbps. The step size is higher for higher rates but is never greater than 0. The maximum permitted burst size is 2 MB for rates up to Mbps, and ms for higher rates. For rates that are less than or equal to Mbps, burst granularity varies from bytes to 16, bytes in proportion to the burst value. The worst case rounding error is 1. For rates greater than Mbps, the granularity is 1 ms with the corresponding rate as reference.

The Multiple Action Set feature allows you to mark packets with multiple action sets conditional and unconditional through a class map. To support multiple action sets, the following combinations are supported of conform and exceed actions:. At least two set actions for each policer action can be configured by using the conform-action command, the exceed-action command, or the violate-action command within a class map for IP, MPLS , or Layer 2 data paths.

If partial multiple set actions are used, hierarchical policing is not supported. In addition to rate-limiting, traffic policing allows you to independently mark or classify the packet according to whether the packet conforms or violates a specified rate. Packet marking also allows you to partition your network into multiple priority levels or CoS.

Packet marking as a policer action is conditional marking. Then networking devices within your network can use this setting to determine how the traffic should be treated. Table 4 shows the supported conditional policer marking operations. None of the following class-based conditional policer marking operations are supported on ATM interfaces.

Table 5 shows the default policer granularity values. Table 6 shows the default shaper granularity values. The Policer Granularity and Shaper Granularity feature s allow you to override the default policer and shaper granularity values. Policer granularity can be configured in the ingress and egress directions. The policer granularity is specified as a permissible percentage variation between the user-configured policer rate, and the hardware programmed policer rate. Shaper granularity can only be configured in the egress direction.

The shape rate you set, using the shape average command, should be a multiple of the shaper granularity. For example, if the shape rate is set to kbps but the shaper granularity is configured to kbps, the effective shape rate is kbps, that is a multiple of kbps. To get an actual shape rate of kbps, configure the shaper granularity to 64 kbps.

Because is a multiple of 64, the shape rate will be exactly kbps. Bundle QoS granularity supports both, ingress and egress policy-maps. Policer or shaper can be only up to 16G per class on 40G linecard, and G for G linecard. Maximum number of supported classes across all service-policy instances for each linecard is , depending on the use of the Ternary Content Addressable Memory TCAM memory.

The bandwidth command allows you to specify the minimum guaranteed bandwidth to be allocated for a specific class of traffic. MDRR is implemented as the scheduling algorithm. The bandwidth remaining command specifies a weight for the class to the MDRR. The MDRR algorithm derives the weight for each class from the bandwidth remaining value allocated to the class.

If you do not configure the bandwidth remaining command for any class, the leftover bandwidth is allocated equally to all classes for which bandwidth remaining is not explicitly specified. Guaranteed Service rate of a queue is defined as the bandwidth the queue receives when all the queues are congested. It is defined as:. On ATM interfaces, if there are other bandwidth commands configured in the same class, the bandwidth remaining command cannot be configured.

The amount of bandwidth configured should be large enough to also accommodate Layer 2 overhead. A policy map can have all class bandwidths specified in kilobits per second or percentages but not a mixture of both in the same class. The bandwidth command is supported only on policies configured on outgoing interfaces. In the ingress direction, bandwidth calculations do not include Layer 2 overhead because Layer 2 headers are stripped off when a packet is received.

In other instances, the bandwidth calculations include the Layer 2 encapsulation. Creates or modifies a policy map that can be attached to one or more interfaces to specify a service policy and enters the policy map configuration mode. Specifies the name of the class whose policy you want to create or change. Specifies the bandwidth allocated for a class belonging to a policy map and enters the policy map class configuration mode.

In this example, class class1 is guaranteed 50 percent of the interface bandwidth. Specifies how to allocate leftover bandwidth to various classes. Specifies the name of a different class whose policy you want to create or change. Specifies the bandwidth allocated for a class belonging to a policy map. In this example, class class2 is guaranteed 10 percent of the interface bandwidth. Returns the router to global configuration mode. Enters interface configuration mode and configures an interface.

Attaches a policy map to an input or output interface to be used as the service policy for that interface. In this example, the traffic policy evaluates all traffic leaving that interface. Optional Displays policy configuration information for all classes configured for all service policies on the specified interface.

The priority command configures LLQ with strict priority queuing PQ that allows delay-sensitive data such as voice to be dequeued and sent before packets in other queues are dequeued. When a class is marked as high priority using the priority command, you must configure a policer to limit the priority traffic.

This configuration ensures that the priority traffic does not constrain all the other traffic on the line card, which protects low priority traffic from limitations. Use the police command to explicitly configure the policer. When multiple classes within a single policy map are configured as priority classes, all traffic from these classes is queued to the same single priority queue.

The shape average , bandwidth , and random-detect commands cannot be configured in the same class with the priority command. Specifies the name of the class whose policy you want to create or change and enters the policy map class configuration mode. Configures traffic policing and enters policy map police configuration mode.

In this example, the low-latency queue is restricted to kbps to protect low-priority traffic from starvation and to release bandwidth. Configures the action to take on packets that exceed the rate limit. Specifies priority to a class of traffic belonging to a policy map. If no priority level is configured, the default is priority 1. Returns the router to Global Configuration mode. Enters interface configuration mode, and configures an interface.

Traffic shaping allows you to control the traffic exiting an interface to match its transmission to the speed of the remote target interface and ensure that the traffic conforms to policies contracted for it. Shaping performed on outgoing interfaces is done at the Layer 2 level and includes the Layer 2 header in the rate calculation.

Shaping performed on incoming interfaces is done at the Layer 3 level and does not include the Layer 2 header in the rate calculation. The bandwidth, priority and shape average commands should not be configured together in the same class. Shapes traffic to the indicated bit rate according to average rate shaping in the specified units or as a percentage of the bandwidth. Traffic policing allows you to control the maximum rate of traffic sent or received on an interface.

The traffic policing feature works with a token bucket algorithm. Configures the action to take on packets that conform to the rate limit. The action argument is specified by one of these keywords:. Range is 0 to 7. The action argument is specified by one of the keywords specified in Step 5. Creates or modifies a class map that can be attached to one or more interfaces to specify a matching policy and enters the class map configuration mode.

Match not fr-de 1 is typically used to specify a conform-color packet. Match fr-de 1 is typically used to specify an exceed-color packet. Configures the class-map name to assign to conform-color packets. Configures the class-map name to assign to exceed-color packets. Attaches a policy map to an input interface to be used as the service policy for that interface.

Use the Shaper Granularity feature to configure the shaper granularity value so that the shape rate you specify is a multiple of the shaper granularity. The line card must be reloaded, for the configured shape granularity to take effect.

Effective shape rate is a multiple of the shaper granularity. Configures the specified shaper granularity on the output interface. Granularity of police rate for link aggregation LAG bundles can be defined using the following keywords:. Enters policy map configuration mode. Creates or modifies a policy map that can be attached to one or more interfaces to specify a service policy.

Enters policy map class configuration mode. Specifies the police rate. The granularity of shape average for link aggregation LAG bundles is defined using these keywords:. Specifies the name of the class whose policy is to be created or changed. Specifies the shape average rate.

The configured value is the committed information rate per-million or per-thousand as the case may be of the link bandwidth. The policer granularity is specified as a permissible percentage variation between the user-configured police rate and the hardware programmed police rate.

The configured value will be applied only for all future traffic policies configured on the interface. For example, if the shape rate is set to kbps but the shaper granularity is configured to kbps, the effective shape rate is kbps. Use the show hw-module qos output shape granularity location command to verify theshaper granularity.

The Configured Shape Granularity is the user-configured shaper granularity. The LC reload value indicates if a line card reload will be required in order to bring the configured shaper granularity rate into effect. If a configured shaper granularity is not applied, the HW Programmed Granularity is applied. These examples show how to configure multiple action sets for both conditional and unconditional markings in both the ingress and egress directions:.

This example shows how to configure conditional policer markings in the ingress direction:. If policy map p1 is applied as an ingress policy, the following action sets are applied:. By using the conform-action command, IP packets are marked with the precedence value of 2 and the MPLS experimental value for the imposition label is set to 3; whereas, MPLS packets are marked with the MPLS experimental value for the imposition label that is set to 3 and the topmost label is set to 4.

By using the exceed-action command, IP packets are marked with the precedence value of 4 and the MPLS experimental value for the imposition label is set to 5; whereas, MPLS packets are marked with the MPLS experimental value for the imposition label that is set to 5 and the topmost label is set to 6. By using the violate-action command, IP packets are marked with the discard class value of 3 and the QoS group value of 4; whereas, MPLS packets are marked with the discard class value of 3 and the QoS group value of 4.

These examples show how to configure unconditional QoS markings in the ingress direction. If policy map p4 is applied as an ingress policy, the following sets are applied:. IP packets are marked with the precedence value of 5 by using the set precedence command. The MPLS experimental value for the imposition label is marked by using the set mpls experimental command.

If you do not configure this command for any class, the default value of the BWRR is considered as 1 one. The bandwidth remaining command is supported only for egress policies. The bandwidth , bandwidth remaining , shaping , queue-limit and wred commands may be configured together in the same class.

But, priority cannot be configured along with bandwidth , bandwidth remaining and wred commands. You have to accomplish the following to complete the minimum bandwidth and bandwidth remaining configuration:. Creating or modifying a policy-map that can be attached to one or more interfaces. Specifying the traffic class whose policy has to be created or changed. Attaching the policy-map to an output interface.

Bandwidth Remaining. Priority Queueing PQ in strict priority mode ensures that one type of traffic is sent, possibly at the expense of all others. For PQ, a low-priority queue can be detrimentally affected, and, in the worst case, never allowed to send its packets if a limited amount of bandwidth is available or the transmission rate of critical traffic is high. Configuring low latency queueing LLQ with strict priority queuing PQ allows delay-sensitive data such as voice to be de-queued and sent before the packets in other queues are de-queued.

Only priority level 1 to 7 is supported , with 1 being the highest priority and 7 being the lowest. However, the default CoSQ 0 has the lowest priority among all. Priority level 1 to 7 is supported for non-H-QoS profiles, with 1 being the highest priority and 7 being the lowest. For H-QoS profiles, priority level 1 to 4 is supported. For all profiles, however, the class default is CoSQ 0 and has the lowest priority among all. Egress policing is not supported.

Hence, in the case of strict priority queuing, there are chances that the other queues do not get serviced. You can configure shape average and queue-limit commands along with priority. You have to accomplish the following to complete the LLQ with strict priority queuing:.

Traffic shaping allows you to control the traffic flow exiting an interface to match its transmission to the speed of the remote target interface and ensure that the traffic conforms to policies contracted for it. Traffic adhering to a particular profile can be shaped to meet downstream requirements, hence eliminating bottlenecks in topologies with data-rate mismatches. The traffic shaping performed on outgoing interfaces is done at the Layer 1 level and includes the Layer 1 header in the rate calculation.

It is mandatory to configure all the eight qos-group classes including class-default for the egress policies. You can configure shape average command along with priority command. Congestion Management Overview. Traffic policing allows you to control the maximum rate of traffic sent or received on an interface and to partition a network into multiple priority levels or class of service CoS.

Traffic policing manages the maximum rate of traffic through a token bucket algorithm. The token bucket algorithm uses user-configured values to determine the maximum rate of traffic allowed on an interface at a given moment in time. The token bucket algorithm is affected by all traffic entering or leaving the interface depending on where the traffic policy with traffic policing is configured and is useful in managing network bandwidth in cases where several large packets are sent in the same traffic stream.

By default, the configured bandwidth value takes into account the Layer 2 encapsulation that is applied to traffic leaving the interface. Traffic policing also provides a certain amount of bandwidth management by allowing you to set the burst size Bc for the committed information rate CIR.

See, Committed Bursts and Excess Bursts. See Single-Rate Policer. See Two-Rate Policer. Traffic policing is supported only in ingress direction, and only color-blind mode is supported. For traffic in one out of two interfaces, the policed rate will be 1Gbps. For traffic on two interfaces, policed rate will be 2Gbps. Unlike a traffic shaper, a traffic policer does not buffer excess packets and transmit them later. Policing uses normal or committed burst bc values and excess burst values be to ensure that the router reaches the configured committed information rate CIR.

Policing decides if a packet conforms or exceeds the CIR based on the burst values you configure. Burst parameters are based on a generic buffering rule for routers, which recommends that you configure buffering to be equal to the round-trip time bit-rate to accommodate the outstanding TCP windows of all connections in times of congestion.

During periods of congestion, proper configuration of the excess burst parameter enables the policer to drop packets less aggressively. For more details, see Committed Bursts and Excess Bursts. A single-rate two-color SR2C policer provides one token bucket with two actions for each packet: a conform action and an exceed action.

Based on the committed information rate CIR value, the token bucket is updated at every refresh time interval. The Tc token bucket can contain up to the Bc value, which can be a certain number of bytes or a period of time. If a packet of size B is greater than the Tc token bucket, then the packet exceeds the CIR value and a default action is performed. If a packet of size B is less than the Tc token bucket, then the packet conforms and a different default action is performed.

A single-rate three-color SR3C policer provides one token bucket with three actions for each packet: a conform action, an exceed action and a violate action. If a packet does not exceed the CBS, it is marked as conformed packet. If it exceeds the EBS as well, it is marked as violate packet. Traffic policing is often configured on interfaces at the edge of a network to limit the rate of traffic entering or leaving the network. The default conform action for single-rate two color policer is to transmit the packet and the default exceed action is to drop the packet.

Users cannot modify these default actions. You have to accomplish the following to complete the traffic policing configuration:. Specifying the policy rate for the traffic. Attaching the policy-map to an input interface. Traffic Policing.

The default conform action and exceed actions for single-rate three-color policer are to transmit the packet and the default violate action is to drop the packet. User cannot modify these default actions. Configuring the policy rate for the traffic along with the peak-burst values. The two-rate policer manages the maximum rate of traffic by using two token buckets: the committed token bucket and the peak token bucket.

The dual-token bucket algorithm uses user-configured values to determine the maximum rate of traffic allowed on a queue at a given moment. In this way, the two-rate policer can meter traffic at two independent rates: the committed information rate CIR and the peak information rate PIR. The dual-token bucket algorithm provides users with three actions for each packet—a conform action, an exceed action, and an optional violate action.

Traffic entering a queue with the two-rate policer configured is placed into one of these categories. The actions are pre-determined for each category. The default conform and exceed actions are to transmit the packet, and the default violate action is to drop the packet.

This figure shows how the two-rate policer marks a packet and assigns a corresponding action to the packet. Also, see Two-Rate Policer Details. The default conform and exceed actions for two-rate three-color 2R3C policer are to transmit the packet and the default violate action is to drop the packet.

You have to accomplish the following to complete the two-rate three-color traffic policing configuration:. A policer is programmed per NPU core on a bundle interface. So, all members on a bundle interface from the same core share the policer.

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245 QoS Configuration Example

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QoS support on BVI will allow the application of the policy map directly on the virtual interface. This will enable aggregate policing and marking on the virtual interface. The policy can be applied on either the ingress or egress side of the BVI to mark and police traffic going to and from the bridge domain. Queuing can be performed by marking the qos-group and then adding a interface policy that matches the qos-group.

The following table indicates the QoS fields that are supported on BVI for classification and marking. This enables aggregate policing and marking on the tunnel. The policy can be applied on the ingress side of the tunnel to mark and police payload traffic going into the tunnel. QoS is not supported on traffic egressing out of the tunnel. The following example shows application of a marking output service policy on a GRE tunnel. Policer granularity can be configured in the ingress and egress directions.

The policer granularity is specified as a permissible percentage variation between the user-configured policer rate, and the hardware programmed policer rate. Policers applied in either the ingress or egress direction can have any configured rate. However, different line card generations have different granularity as to what rates can be programmed in the hardware.

Because of this, a desired rate configured in the policy map may get rounded down to the nearest granularity increment. Ethernet line cards support a granularity of 64 kbps increments. Hence, if you specify a police rate on Ethernet line cards that is not a multiple of 64, the police rate is rounded down to the nearest 64 kbps increment.

Enhanced Ethernet line cards support a granularity of 8 kbps, so a configured rate is rounded down to the nearest 8 kbps increment. Random early detection based on the DEI value is supported on If there are any marking actions in the policy, the marked values are used for doing WRED. The bandwidth command allows you to specify the minimum guaranteed bandwidth to be allocated for a specific class of traffic.

MDRR is implemented as the scheduling algorithm. The bandwidth remaining command specifies a weight for the class to the MDRR. The MDRR algorithm derives the weight for each class from the bandwidth remaining value allocated to the class. If you do not configure the bandwidth remaining command for any class, the leftover bandwidth is allocated equally to all classes for which bandwidth remaining is not explicitly specified.

Guaranteed Service rate of a queue is defined as the bandwidth the queue receives when all the queues are congested. It is defined as:. The amount of bandwidth configured should be large enough to also accommodate Layer 2 overhead. The bandwidth command is supported only on policies configured on outgoing interfaces.

Enters global configuration mode. Creates or modifies a policy map that can be attached to one or more interfaces to specify a service policy and enters the policy map configuration mode. Specifies the name of the class whose policy you want to create or change.

Specifies the bandwidth allocated for a class belonging to a policy map and enters the policy map class configuration mode. In this example, class class1 is guaranteed 50 percent of the interface bandwidth. Specifies how to allocate leftover bandwidth to various classes. Returns the router to policy map configuration mode.

Specifies the name of a different class whose policy you want to create or change. Specifies the bandwidth allocated for a class belonging to a policy map. In this example, class class2 is guaranteed 10 percent of the interface bandwidth. Returns the router to global configuration mode. Enters interface configuration mode and configures an interface. Attaches a policy map to an input or output interface to be used as the service policy for that interface.

In this example, the traffic policy evaluates all traffic leaving that interface. Use the commit or end command. Yes — Saves configuration changes and exits the configuration session. No —Exits the configuration session without committing the configuration changes. Cancel —Remains in the configuration session, without committing the configuration changes. Optional Displays policy configuration information for all classes configured for all service policies on the specified interface.

Enters policy map configuration mode. Creates or modifies a policy map that can be attached to one or more interfaces to specify a service policy. Enters policy map class configuration mode. In this example, class class1 is guaranteed 40 percent of the interface bandwidth. In this example, class class2 is guaranteed 40 percent of the interface bandwidth. In this example, class class-default is guaranteed 20 percent of the interface bandwidth.

Saves configuration changes. When you issue the end command, the system prompts you to commit changes:. Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode. Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes. Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session. Specifies how to allocate leftover bandwidth for class class1. Specifies how to allocate leftover bandwidth for class class2. Specifies how to allocate leftover bandwidth for class class-default. The priority command configures LLQ with strict priority queuing PQ that allows delay-sensitive data such as voice to be dequeued and sent before packets in other queues are dequeued.

When a class is marked as high priority using the priority command, you must configure a policer to limit the priority traffic. This configuration ensures that the priority traffic does not constrain all the other traffic on the line card, which protects low priority traffic from limitations. Use the police command to explicitly configure the policer.

Eight levels of priorities are supported: priority level 1, priority level 2, priority level 3, priority level 4, priority level 5, priority level 6, priority level 7 and the priority level normal. If no priority level is configured, the default is priority level normal. The output of the show policy-map interface command is inconsistent for priority level 1, priority level 2, priority level 3 that is configured on the bundle interface, when the interface has either of these combinations:.

Unused priority queues cannot be used for a different priority level. The eight priority levels can be configured only on egress of main physical interface or main bundle interface. The policy-map with eight priorities must have only one queuing class at the parent level of the priority class. If the policy-map has a parent class, the parent class cannot have bandwidth configured. When multiple classes within a single policy map are configured as priority classes, all traffic from these classes is queued to the same single priority queue.

Specifies the name of the class whose policy you want to create or change and enters the policy map class configuration mode. Configures traffic policing and enters policy map police configuration mode. In this example, the low-latency queue is restricted to kbps to protect low-priority traffic from starvation and to release bandwidth.

Configures the action to take on packets that exceed the rate limit. Returns the router to policy map class configuration mode. Specifies priority to a class of traffic belonging to a policy map. If no priority level is configured, the default is priority 1. Returns the router to Global Configuration mode. Enters interface configuration mode, and configures an interface. Traffic shaping allows you to control the traffic exiting an interface to match its transmission to the speed of the remote target interface and ensure that the traffic conforms to policies contracted for it.

Shaping performed on incoming and outgoing interfaces is done at the Layer 2 level and includes the Layer 2 header in the rate calculation. The bandwidth, priority and shape average commands should not be configured together in the same class. Shapes traffic to the indicated bit rate according to average rate shaping in the specified units or as a percentage of the bandwidth.

Traffic policing allows you to control the maximum rate of traffic sent or received on an interface. This section provides the procedure for configuring two-rate color-blind traffic policing. The traffic policing feature works with a token bucket algorithm.

Configures the action to take on packets that conform to the rate limit. The action argument is specified by one of these keywords:. Range is 0 to 7. Range is from 0 to The action argument is specified by one of the keywords specified in Step 5. Enters configuration mode and configures an interface. This section provides the procedure for configuring two-rate three-color traffic policing. It is applicable to SIP line cards on the ingress side only. Use with SIP line card, ingress only.

Creates or modifies a class map that can be attached to one or more interfaces to specify a matching policy and enters the class map configuration mode. Match not fr-de 1 is typically used to specify a conform-color packet. Match fr-de 1 is typically used to specify an exceed-color packet.

Configures the class-map name to assign to conform-color packets. Configures the class-map name to assign to exceed-color packets. Range is 0 to Attaches a policy map to an input interface to be used as the service policy for that interface. Hierarchical policing provides support at two levels:. The allowed action is:. To avoid the problem of system idle in the configuration mode while performing IRB QoS in-place modification, you can remove the QoS policy from the BVI before modifying related class-maps or policy-maps.

Specifies the BVI to which the Qos policy will get attached to. Policer for BVI is aggregated per Network processor. ECN helps routers and end hosts to understand that the network is congested and slow down the rate at which packets are transmitted. Specifies or modifies the bandwidth allocated for a class in a specific policy-map.

Optional Displays statistics for all classes configured for all service policies on the specified interface. This ensures lesser packet drops or low latency for priority packets across ports sharing the egress buffer as required. You can allocate or carve the buffer space using one of two available options: dynamic or static.

Because the buffer spaces must accommodate packet buffering as well as overhead, the actual packet buffering capability depends on the frame size, frame alignment to multiples of buffer particles 32 B , and active queue scale. On these cards, each network processor has 3 GB of egress queuing memory.

The dynamic buffer allocation option manages the 3 GB of egress queuing memory available for packet buffering by defining three logical regions:. Shared region—2. These ports consume the shared region first on a first-come and first-serve basis. Reserved region— MB of egress queuing memory is reserved for internal ports and critical control protocol protection, yield at 4-ms buffering per port.

This region is not available for transit packet buffering. Protection region— MB of egress queuing memory is available for port guarantees and for priority traffic protection. Ports that have not exhausted their guaranteed 10 ms of buffering can use this region.

This region is also used for ports that have not exhausted their ms limit to packet buffer under congestion. Transit priority packets are scheduled first out of any port; so, priority buffering is rare and happens only for transient bursts on a well-designed network. Dynamic buffer allocation mode does not guarantee per-priority buffering limits and hence does not support 8-priority user policies.

The static buffer mode allocates buffers equally, on a per-port or per-port-group basis. This allocation guarantees a predefined and fixed amount of buffer memory for each port under traffic congestion. In static buffer allocation mode, buffers allocated and unused by a port cannot be used by other congested ports on the same network processor. To use the static buffer allocation option, you must first enable it as detailed in this section.

To enable the static buffer allocation mode, use the hw-module buffer-carve-mode command. If WRED is configured, then this buffering feature is not applicable. This is because user-defined WRED takes precedence over this feature. Else, the dynamic mode is enabled. You can also run the show qoshal default-queue command to view the buffer carving mode per port. The following example shows how to run the random-detect ecn command to configure ECN:.

These sections provide references related to implementing QoS congestion management. Initial system bootup and configuration. No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content. PDF - Complete Book 6. Updated: February 17, Configuring Modular QoS Congestion Management Congestion management controls congestion after it has occurred on a network.

Release 3. Release 4. Release 5. Release 6. Modified Deficit Round Robin MDRR is a class-based composite scheduling mechanism that allows for queueing of up to eight traffic classes. Overhead Accounting Traffic shapers and policers use packet traffic descriptors to ensure adherence to the service level agreement in QoS. Any interface that supports QoS policies supports overhead accounting. Prerequisites and Restrictions Overhead accounting for ingress shaping is not supported. Configuring for Overhead Accounting To configure overhead accounting, you must: Create a policy map and configure QoS actions for that map.

Configure overhead accounting and attach the map to an interface. Configure the new overhead accounting value. Associated Commands service-policy overhead accounting Traffic Shaping Traffic shaping allows you to control the traffic flow exiting an interface to match its transmission to the speed of the remote target interface and ensure that the traffic conforms to policies contracted for it.

To match the rate of transmission of data from the source to the target interface, you can limit the transfer of data to one of the following: A specific configured rate A derived rate based on the level of congestion The rate of transfer depends on these three components that constitute the token bucket: burst size, mean rate, and time measurement interval.

Figure 1. How a Traffic Shaping Mechanism Regulates Traffic Packets matching the specified criteria are placed in the token bucket. One of the following occurs: If there are enough tokens in the token bucket, the packet is sent transmitted. Traffic Policing In general, traffic policing allows you to control the maximum rate of traffic sent or received on an interface and to partition a network into multiple priority levels or class of service CoS.

Regulation of Traffic with the Policing Mechanism This section describes the single-rate and two-rate policing mechanisms. Figure 2. Two-Rate Policer The two-rate policer manages the maximum rate of traffic by using two token buckets: the committed token bucket and the peak token bucket. This token bucket holds the tokens that determine whether a packet conforms to or exceeds the CIR as the following describes: A traffic stream is conforming when the average number of bytes over time does not cause the committed token bucket to overflow.

Figure 3. Marking Packets and Assigning Actions—2-Rate Policer For example, if a data stream with a rate of kbps arrives at the two-rate policer, and the CIR is kbps and the PIR is kbps, the policer marks the packet in the following way: kbps conforms to the rate kbps exceeds the rate 50 kbps violates the rate The router updates the tokens for both the committed and peak token buckets in the following way: The router updates the committed token bucket at the CIR value each time a packet arrives at the interface.

Committed Bursts and Excess Bursts Unlike a traffic shaper, a traffic policer does not buffer excess packets and transmit them later. The following sections describe committed bursts and excess bursts, and the recommended formula for calculating each of them: Committed Bursts, page 24 Excess Bursts, page 25 Deciding if Packets Conform or Exceed the Committed Rate, page 26 Committed Bursts Committed Burst Calculation Excess Bursts Excess Burst Calculation Committed Bursts The committed burst bc parameter of the police command implements the first, conforming green token bucket that the router uses to meter traffic.

The following describes how the meter uses the conforming token bucket to send packets: If sufficient tokens are in the conforming token bucket when a packet arrives, the meter marks the packet green and decrements the conforming token count by the number of bytes of the packet.

If the exceeding token bucket has a sufficient number of tokens available, the meter marks the packet: Green and decrements the conforming token count down to the minimum value of 0. Note When the meter marks a packet with a specific color, there must be a sufficient number of tokens of that color to accommodate the entire packet. The following describes how the meter uses the exceeding token bucket to send packets: When the first token bucket the conforming bucket meets the committed burst size CBS , the meter allows the traffic flow to borrow the tokens needed from the exceeding token bucket.

Deciding if Packets Conform or Exceed the Committed Rate Policing uses normal or committed burst bc and excess burst be values to ensure that the configured committed information rate CIR is reached. Note Color-aware policing is not supported for hierarchical QoS. Figure 4. Applying hierarchical policy maps. Policing of egress traffic.

Configuring conform or violate actions. Three different scenarios arise if the number of packets in the queue is between the minimum threshold and the maximum threshold: If the ECN field on the packet indicates that the endpoints are ECN-capable that is, the ECT bit is set to 1 and the CE bit is set to 0, or the ECT bit is set to 0 and the CE bit is set to 1 —and the WRED algorithm determines that the packet should have been dropped based on the drop probability—the ECT and CE bits for the packet are changed to 1, and the packet is transmitted.

Percentage policer at lower level without reference policer rate at upper level. QoS policy propagation using Border Gateway Protocol BGP Note Queuing can be performed by marking the qos-group and then adding a interface policy that matches the qos-group. The supported interfaces are indicated below.

For all generations of linecards, the minimum police rate is 64 kbps. Note The remaining bandwidth of 40 percent is shared by class class1 and class2 see Steps 8 and 9 in a ratio: class class1 receives 20 percent of the 40 percent, and class class2 receives 80 percent of the 40 percent. Step 14 Use the commit or end command. Configuring Low-Latency Queueing with Strict Priority Queueing The priority command configures LLQ with strict priority queuing PQ that allows delay-sensitive data such as voice to be dequeued and sent before packets in other queues are dequeued.

Note Eight levels of priorities are supported: priority level 1, priority level 2, priority level 3, priority level 4, priority level 5, priority level 6, priority level 7 and the priority level normal. Restrictions Unused priority queues cannot be used for a different priority level. Step 12 Use the commit or end command. Configuring Traffic Shaping Traffic shaping allows you to control the traffic exiting an interface to match its transmission to the speed of the remote target interface and ensure that the traffic conforms to policies contracted for it.

Restrictions The bandwidth, priority and shape average commands should not be configured together in the same class. Step 7 Specifies the name of the class whose policy you want to create or change. Step 9 Use the commit or end command. Configuring Traffic Policing Two-Rate Color-Blind Traffic policing allows you to control the maximum rate of traffic sent or received on an interface.

The action argument is specified by one of these keywords: drop —Drops the packet. Configuring Traffic Policing 2R3C This section provides the procedure for configuring two-rate three-color traffic policing. Step 16 Use the commit or end command. The allowed action is: transmit —Transmits the packets.

The allowed action is: drop —Drops the packet. You can use the command, show controller np ports to check for interfaces on a particular NP. Note To avoid the problem of system idle in the configuration mode while performing IRB QoS in-place modification, you can remove the QoS policy from the BVI before modifying related class-maps or policy-maps. Note police rate is more suitable for regular, flat policy maps. Configuring ECN ECN helps routers and end hosts to understand that the network is congested and slow down the rate at which packets are transmitted.

Note ECN can be configured with any queuing action, such as , bandwidth, shaping, etc. Note Because the buffer spaces must accommodate packet buffering as well as overhead, the actual packet buffering capability depends on the frame size, frame alignment to multiples of buffer particles 32 B , and active queue scale.

The dynamic buffer allocation option manages the 3 GB of egress queuing memory available for packet buffering by defining three logical regions: Shared region—2. Restrictions Restrictions Dynamic buffer allocation mode does not guarantee per-priority buffering limits and hence does not support 8-priority user policies.

Static Buffer Allocation The static buffer mode allocates buffers equally, on a per-port or per-port-group basis. Configuration Example You must accomplish the following to enable the static buffer allocation: To enable the static buffer allocation mode, use the hw-module buffer-carve-mode command. Reload the line cards for the changes to take effect. Last configuration change at Fri Jan 10 by root! ECN: Example The following example shows how to run the random-detect ecn command to configure ECN: config policy-map p1 class c1 bandwidth random-detect dscp 1 packets packets random-detect ecn exit exit commit Hierarchical Policing: Example Additional References These sections provide references related to implementing QoS congestion management.

Was this Document Helpful? Yes No Feedback. Traffic Policing. Traffic Shaping. Endpoints of the transport protocol are ECN-capable. Congestion experienced. Discard class. Prec dscp. You can perform queuing by applying QoS policy instead on the physical interface.

Tunnel Precedence. Class of Service CoS. IPv4 L3 field. L3 main interface. L3 sub-interface. L2 main interface. L2 sub-interface. The remaining bandwidth of 40 percent is shared by class class1 and class2 see Steps 8 and 9 in a ratio: class class1 receives 20 percent of the 40 percent, and class class2 receives 80 percent of the 40 percent. Step Use with SIP line card, ingress only Creates or modifies a class map that can be attached to one or more interfaces to specify a matching policy and enters the class map configuration mode.

Use with SIP line card, ingress only Specifies the matching condition: Match not fr-de 1 is typically used to specify a conform-color packet. Use with SIP line card, ingress only Configures the class-map name to assign to conform-color packets. The congestion management features in Cisco IOS XR software allow you to specify creation of a different number of queues, affording greater or lesser degree of differentiation of traffic, and to specify the order in which that traffic is sent.

During periods with light traffic flow, that is, when no congestion exists, packets are sent out the interface as soon as they arrive. During periods of transmit congestion at the outgoing interface, packets arrive faster than the interface can send them. If you use congestion management features, packets accumulating at an interface are queued until the interface is free to send them; they are then scheduled for transmission according to their assigned priority and the queuing method configured for the interface.

The router determines the order of packet transmission by controlling which packets are placed in which queue and how queues are serviced with respect to each other. In addition to queuing methods, QoS congestion management mechanisms, such as policers and shapers, are needed to ensure that a packet adheres to a contract and service. Both policing and shaping mechanisms use the traffic descriptor for a packet. Policers and shapers usually identify traffic descriptor violations in an identical manner through the token bucket mechanism, but they differ in the way they respond to violations.

A policer typically drops traffic flow; whereas, a shaper delays excess traffic flow using a buffer, or queuing mechanism, to hold the traffic for transmission at a later time. Traffic shaping and policing can work in tandem. For example, a good traffic shaping scheme should make it easy for nodes inside the network to detect abnormal flows.

Clear Channel ATM subinterfaces support eight queues per subinterface. On egress subinterfaces, you can configure a service policy with a maximum of seven non-default classes with queueing actions. Other classes must not have queueing actions. When MDRR is configured in the queuing strategy, nonempty queues are served one after the other.

Each time a queue is served, a fixed amount of data is dequeued. The algorithm then services the next queue. When a queue is served, MDDR keeps track of the number of bytes of data that were dequeued in excess of the configured value. In the next pass, when the queue is served again, less data is dequeued to compensate for the excess data that was served previously. As a result, the average amount of data dequeued per queue is close to the configured value.

In addition, MDRR allows for a strict priority queue for delay-sensitive traffic. Each queue within MDRR is defined by two variables:. Quantum value—Average number of bytes served in each round. Deficit counter—Number of bytes a queue has sent in each round. The counter is initialized to the quantum value. Packets in a queue are served as long as the deficit counter is greater than zero. Each packet served decreases the deficit counter by a value equal to its length in bytes. A queue can no longer be served after the deficit counter becomes zero or negative.

In each new round, the deficit counter for each nonempty queue is incremented by its quantum value. In general, the quantum size for a queue should not be smaller than the maximum transmission unit MTU of the interface to ensure that the scheduler always serves at least one packet from each nonempty queue. PQ in strict priority mode ensures that one type of traffic is sent, possibly at the expense of all others. For PQ, a low-priority queue can be detrimentally affected, and, in the worst case, never allowed to send its packets if a limited amount of bandwidth is available or the transmission rate of critical traffic is high.

Strict PQ allows delay-sensitive data, such as voice, to be dequeued and sent before packets in other queues are dequeued. LLQ enables the use of a single, strict priority queue within MDRR at the class level, allowing you to direct traffic belonging to a class. To rank class traffic to the strict priority queue, you specify the named class within a policy map and then configure the priority command for the class. Classes to which the priority command is applied are considered priority classes.

Within a policy map, you can give one or more classes priority status. When multiple classes within a single policy map are configured as priority classes, all traffic from these classes is enqueued to the same, single, strict priority queue.

Through use of the priority command, you can assign a strict PQ to any of the valid match criteria used to specify traffic. These methods of specifying traffic for a class include matching on access lists, protocols, IP precedence, and IP differentiated service code point DSCP values. Moreover, within an access list you can specify that traffic matches are allowed based on the DSCP value that is set using the first six bits of the IP type of service ToS byte in the IP header.

High-priority traffic under all ports is serviced before any low-priority traffic. This means that the scope of priority assignment at the queue level is global. This is referred to as high-priority propagation, which improves low-latency treatment for high-priority traffic, such as real-time voice and video traffic. Priority is supported only at the queue level, or lowest-level policy map. Priority assignment at the parent level for an egress interface policy is not supported.

High-priority traffic under all ports and groups is serviced before any low-priority traffic. This means that the scope of priority assignment at the queue level is global — it is not limited to the parent group such as on CRS-MSCG or port.

Priority assignment at the group level for an egress interface policy is not supported. The policer rate cannot exceed the shape rate configured for the group or port. This requirement does not apply to fabric QoS polices, because police actions in fabric QoS policies are not supported.

A class configuration that includes a priority action but no police action is not valid. Such a configuration is rejected. In Example 2 , the class configuration in Example 1 is modified to include a police action:. Step size increases with the rate value. Rounding error does not exceed 0. The smallest step size supported is 8 kbps for 10 gigabit interfaces and 64 kbps for gigabit interfaces for queues and groups.

The Multi-Level Priority Queue MPQ feature allows you to configure multiple priority queues for multiple traffic classes by specifying a different priority level for each of the traffic classes in a single service policy map.

You can configure multiple service policy maps per device. Having multiple priority queue enables the device to place delay-sensitive traffic on the outbound link before delay-insensitive traffic. As a result, high-priority traffic receives the lowest latency possible on the device.

While the oversubscription of priority traffic is allowed, an equal treatment of classes having the same priority level is not guaranteed. During oversubscription, priority level is strictly followed for classes with different priority levels. Minimum bandwidth of a group must be equal to or greater than the sum of queue minimum bandwidths and the police rates of the high priority classes under the group.

If the configured value does not meet these requirements, the minimum group bandwidth is automatically increased to satisfy the requirements. Minimum bandwidth of a parent class must be equal to or greater than the sum of the police rates of the high priority classes in the hierarchy. Oversubscription of minimum bandwidth is permitted. In the event of oversubscription, the actual minimum bandwidth that a group or queue receives is proportional to its configured value.

Traffic shapers and policers use packet traffic descriptors to ensure adherence to the service level agreement in QoS. However, when traffic flows from one hop to another in a network, headers added or removed at interim hops affect the packet bytes being accounted for by QoS at each hop. When your end-user network measures the packet bytes to ensure they receive the payload as agreed, these additional header bytes cause a discrepancy. For example, if the QoS commitment includes the additional header bytes, the overhead accounting feature allows your router to account for this overhead and reduces the traffic policing and shaping rates accordingly.

This is also called a positive accounting overhead. This is also called a negative accounting overhead. To summarize, QoS overhead accounting enables the router to account for packet overhead when shaping and policing traffic to a specific rate. This accounting ensures that the router runs QoS features on the actual bandwidth that the subscriber traffic consumes.

Overhead Accounting controls the type of overhead and packet length for statistics, policing shaping and queuing. The account option can be specified with a service-policy when applying a policy to an interface. For bundle interfaces, the configured accounting option is applied to all member interfaces. Traffic shaping allows you to control the traffic flow exiting an interface to match its transmission to the speed of the remote target interface and ensure that the traffic conforms to policies contracted for it.

Traffic adhering to a particular profile can be shaped to meet downstream requirements, thereby eliminating bottlenecks in topologies with data-rate mismatches. To match the rate of transmission of data from the source to the target interface, you can limit the transfer of data to one of the following:. A derived rate based on the level of congestion.

The rate of transfer depends on these three components that constitute the token bucket: burst size, mean rate, and time measurement interval. The mean rate is equal to the burst size divided by the interval. When traffic shaping is enabled, the bit rate of the interface does not exceed the mean rate over any integral multiple of the interval.

In other words, during every interval, a maximum of burst size can be sent. Within the interval, however, the bit rate may be faster than the mean rate at any given time. For ATM Layer 3 subinterfaces, shaping is not supported in the egress direction. VC shaping cannot be configured, removed, or modified on an interface that already has an egress service policy configured.

The default shape is UBR at line rate. For Ethernet interfaces, this translates to 20 bytes of Layer 1 overhead in addition to the Layer 2 overhead. In general, traffic policing allows you to control the maximum rate of traffic sent or received on an interface and to partition a network into multiple priority levels or class of service CoS. Traffic policing manages the maximum rate of traffic through a token bucket algorithm.

The token bucket algorithm uses user-configured values to determine the maximum rate of traffic allowed on an interface at a given moment in time. The token bucket algorithm is affected by all traffic entering or leaving the interface depending on where the traffic policy with traffic policing is configured and is useful in managing network bandwidth in cases where several large packets are sent in the same traffic stream.

Traffic entering the interface with traffic policing configured is placed into one of these categories. Within these three categories, users can decide packet treatments. For instance, packets that conform can be configured to be sent, packets that exceed can be configured to be sent with a decreased priority, and packets that violate can be configured to be dropped. Traffic policing is often configured on interfaces at the edge of a network to limit the rate of traffic entering or leaving the network.

In the most common traffic policing configurations, traffic that conforms to the CIR is sent and traffic that exceeds is sent with a decreased priority or is dropped. Users can change these configuration options to suit their network needs. Configured values take into account the Layer 2 encapsulation applied to traffic. This applies to both ingress and egress policing. For Ethernet, the encapsulation is 14 bytes; whereas for Traffic policing also provides a certain amount of bandwidth management by allowing you to set the burst size Bc for the committed information rate CIR.

When the peak information rate PIR is supported, a second token bucket is enforced and then the traffic policer is called a two-rate policer. This section describes the single-rate mechanism. A single-rate, two-action policer provides one token bucket with two actions for each packet: a conform action and an exceed action. This figure illustrates how a single-rate token bucket policer marks packets as either conforming or exceeding a CIR, and assigns an action.

The time interval between token updates Tc to the token bucket is updated at the CIR value each time a packet arrives at the traffic policer. The Tc token bucket can contain up to the Bc value, which can be a certain number of bytes or a period of time. If a packet of size B is greater than the Tc token bucket, then the packet exceeds the CIR value and a configured action is performed.

If a packet of size B is less than the Tc token bucket, then the packet conforms and a different configured action is performed. Smallest granularity supported is 8 kbps for rates up to 8 Mbps. The step size is higher for higher rates but is never greater than 0. The maximum permitted burst size is 2 MB for rates up to Mbps, and ms for higher rates.

For rates that are less than or equal to Mbps, burst granularity varies from bytes to 16, bytes in proportion to the burst value. The worst case rounding error is 1. For rates greater than Mbps, the granularity is 1 ms with the corresponding rate as reference. The Multiple Action Set feature allows you to mark packets with multiple action sets conditional and unconditional through a class map.

To support multiple action sets, the following combinations are supported of conform and exceed actions:. At least two set actions for each policer action can be configured by using the conform-action command, the exceed-action command, or the violate-action command within a class map for IP, MPLS , or Layer 2 data paths.

If partial multiple set actions are used, hierarchical policing is not supported. In addition to rate-limiting, traffic policing allows you to independently mark or classify the packet according to whether the packet conforms or violates a specified rate. Packet marking also allows you to partition your network into multiple priority levels or CoS. Packet marking as a policer action is conditional marking. Then networking devices within your network can use this setting to determine how the traffic should be treated.

Table 4 shows the supported conditional policer marking operations. None of the following class-based conditional policer marking operations are supported on ATM interfaces. Phy 2. SIf 3. P-SIf 4. Table 5 shows the default policer granularity values. Policer Granularity Default Value. Table 6 shows the default shaper granularity values. Shaper Granularity Default Value. The Policer Granularity and Shaper Granularity feature s allow you to override the default policer and shaper granularity values.

Policer granularity can be configured in the ingress and egress directions. The policer granularity is specified as a permissible percentage variation between the user-configured policer rate, and the hardware programmed policer rate.

Shaper granularity can only be configured in the egress direction. The shape rate you set, using the shape average command, should be a multiple of the shaper granularity. For example, if the shape rate is set to kbps but the shaper granularity is configured to kbps, the effective shape rate is kbps, that is a multiple of kbps.

To get an actual shape rate of kbps, configure the shaper granularity to 64 kbps. Because is a multiple of 64, the shape rate will be exactly kbps. Bundle QoS granularity supports both, ingress and egress policy-maps. Policer or shaper can be only up to 16G per class on 40G linecard, and G for G linecard.

Maximum number of supported classes across all service-policy instances for each linecard is , depending on the use of the Ternary Content Addressable Memory TCAM memory. The bandwidth command allows you to specify the minimum guaranteed bandwidth to be allocated for a specific class of traffic. MDRR is implemented as the scheduling algorithm. The bandwidth remaining command specifies a weight for the class to the MDRR.

The MDRR algorithm derives the weight for each class from the bandwidth remaining value allocated to the class. If you do not configure the bandwidth remaining command for any class, the leftover bandwidth is allocated equally to all classes for which bandwidth remaining is not explicitly specified.

Guaranteed Service rate of a queue is defined as the bandwidth the queue receives when all the queues are congested. It is defined as:. On ATM interfaces, if there are other bandwidth commands configured in the same class, the bandwidth remaining command cannot be configured. The amount of bandwidth configured should be large enough to also accommodate Layer 2 overhead. A policy map can have all class bandwidths specified in kilobits per second or percentages but not a mixture of both in the same class.

The bandwidth command is supported only on policies configured on outgoing interfaces. In the ingress direction, bandwidth calculations do not include Layer 2 overhead because Layer 2 headers are stripped off when a packet is received. In other instances, the bandwidth calculations include the Layer 2 encapsulation. Enters global configuration mode.

Creates or modifies a policy map that can be attached to one or more interfaces to specify a service policy and enters the policy map configuration mode. Specifies the name of the class whose policy you want to create or change. Specifies the bandwidth allocated for a class belonging to a policy map and enters the policy map class configuration mode.

In this example, class class1 is guaranteed 50 percent of the interface bandwidth. Specifies how to allocate leftover bandwidth to various classes. Returns the router to policy map configuration mode. Specifies the name of a different class whose policy you want to create or change. Specifies the bandwidth allocated for a class belonging to a policy map. In this example, class class2 is guaranteed 10 percent of the interface bandwidth. Returns the router to global configuration mode. Enters interface configuration mode and configures an interface.

Attaches a policy map to an input or output interface to be used as the service policy for that interface. In this example, the traffic policy evaluates all traffic leaving that interface. Use the commit or end command. Yes — Saves configuration changes and exits the configuration session. No —Exits the configuration session without committing the configuration changes. Cancel —Remains in the configuration session, without committing the configuration changes. Optional Displays policy configuration information for all classes configured for all service policies on the specified interface.

The priority command configures LLQ with strict priority queuing PQ that allows delay-sensitive data such as voice to be dequeued and sent before packets in other queues are dequeued. When a class is marked as high priority using the priority command, you must configure a policer to limit the priority traffic. This configuration ensures that the priority traffic does not constrain all the other traffic on the line card, which protects low priority traffic from limitations.

Use the police command to explicitly configure the policer. Eight levels of priorities are supported: priority level 1, priority level 2, priority level 3, priority level 4, priority level 5, priority level 6, priority level 7 and the priority level normal. If no priority level is configured, the default is priority level normal.

Unused priority queues cannot be used for a different priority level. The eight priority levels can be configured only on egress of main physical interface or main bundle interface. The policy-map with eight priorities must have only one queuing class at the parent level of the priority class. If the policy-map has a parent class, the parent class cannot have bandwidth configured. When multiple classes within a single policy map are configured as priority classes, all traffic from these classes is queued to the same single priority queue.

The shape average , bandwidth , and random-detect commands cannot be configured in the same class with the priority command. Specifies the name of the class whose policy you want to create or change and enters the policy map class configuration mode. Configures traffic policing and enters policy map police configuration mode. In this example, the low-latency queue is restricted to kbps to protect low-priority traffic from starvation and to release bandwidth.

Configures the action to take on packets that exceed the rate limit. Returns the router to policy map class configuration mode. Specifies priority to a class of traffic belonging to a policy map.

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