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Configuring Rate Limits on Nonqueuing Packet Forwarding Engines

To configure rate limits for nonqueuing Packet Forwarding Engines, include the transmit-rate statement at the [edit class-of-service schedulers scheduler-name] hierarchy level.

Note: Rate limiting is implemented differently on Enhanced Queuing DPCs and non-queuing Packet Forwarding Engines. On Enhanced Queuing DPCs, rate-limiting is implemented using a single rate two color policer. On non-queuing Packet Forwarding Engines, rate-limiting is achieved by shaping the queue to the transmit rate and keeping the queue delay buffers small to prevent too many packets from being queued once the shaping rate is reached.

Configuring the Schedulers

The following example configures schedulers, forwarding classes, and a scheduler map for a rate-limited interface.

[edit class-of-service schedulers]

scheduler-1 {transmit-rate percent 20 rate-limit;priority high;}

scheduler-2 {transmit-rate percent 10 rate-limit;priority strict-high;}

scheduler-3 {transmit-rate percent 40;priority medium-high;}

scheduler-4 {transmit-rate percent 30;priority medium-high;}

Configuring the Forwarding Classes

[edit class-of-service]

forwarding-classes {class cp_000 queue-num 0;class cp_001 queue-num 1;class cp_010 queue-num 2;class cp_011 queue-num 3;class cp_100 queue-num 4;class cp_101 queue-num 5;class cp_110 queue-num 6;class cp_111 queue-num 7;}

Configuring the Scheduler Map

[edit class-of-service scheduler-maps]

scheduler-map-1 {forwarding-class cp_000 scheduler scheduler-1;forwarding-class cp_001 scheduler scheduler-2;forwarding-class cp_010 scheduler scheduler-3;forwarding-class cp_011 scheduler scheduler-4;}

Applying the Scheduler Map to the Interface

[edit interfaces]

ge-1/0/0 {scheduler-map scheduler-map-1;unit 0 {family inet {address 192.168.1.1/32;}}}

TechLibrary

Supported Platforms

Configuring Rate Limits on Nonqueuing Packet Forwarding Engines

Published: 2013-08-28

Supported Platforms

Published: 2013-08-28