Reference Guide

Policy-based rate-policing
You can congure trac rate-limiting in packets per second (pps) for a QoS input policy, and a rate policing value in kilobits per second
(kbps) or pps. Committed rate guarantees bandwidth for trac entering or leaving the interface under normal network conditions.
When trac propagates at an average rate that is greater than or equal to the committed rate and less than peak-rate, it is green colored
or coded. The trac rate above the congured peak-rate is dropped to guarantee a bandwidth limit for an ingress trac ow.
For a system that does not have ingress buers, OS10 performs rate-limiting on the incoming trac stream. The trac rate above the
congured committed rate is tail dropped (which means if the queue is full the packets are dropped) to guarantee a xed bandwidth for an
ingress trac ow.
When the transmitted trac falls below the committed rate, the unused bandwidth aggregates to a maximum, this forms the committed
burst size. Trac is green-coded up to the point it does not exceed the committed burst size.
Peak rate is the maximum rate for trac arriving or exiting an interface under normal trac conditions. Peak burst size indicates the
maximum size of unused peak bandwidth that is aggregated. This aggregated bandwidth enables brief durations of burst trac that
exceeds the peak rate.
1 Create the policy-map type as qos and congure a name for the policy-map in CONFIGURATION mode.
policy-map type qos policy-map-name
2 Enter a class name to apply the shape rate in POLICY-MAP mode.
class class-map-name
3 Congure trac policing on incoming trac in POLICY-MAP-CLASS-MAP mode.
police {cir committed-rate [bc committed-burst-size]} {pir peak-rate [be peak-burst-size]}
• cir committed-rate—Enter a committed rate value in kilobits per second (kbps) (0 to 40000000).
• bc committed-burst-size—(Optional) Enter a committed burst size in packets for control plane and kbps (16 to 200000,
default 200).
• pir peak-rate—Enter a peak-rate value in kbps (0 to 40000000).
• be peak-burst-size—(Optional) Enter a peak burst size in kbps (16 to 200000, default 200).
4 (Optional) Congure trac policing for a specic queue in POLICY-MAP-CLASS-MAP mode. Queue number range is from 0 to 7 for
qos policy map and 0 to 11 for control-plane policy map.
set qos-group queue-number
Congure policy-based rate policy
OS10(config)# policy-map type qos galaxy
OS10(conf-pmap-qos)# class bigbang
OS10(conf-pmap-c-qos)# police cir 5 bc 30 pir 20 be 40
Congure rate policing on specic queue
OS10(config)# policy-map bronze
OS10(conf-pmap-qos)# class silver
OS10(conf-pmap-c-qos)# set qos-group 7
OS10(conf-pmap-c-qos)# police cir 5 pir 30
View policy-map
OS10(conf-pmap-c-qos)# do show policy-map
Service-policy (qos) input: galaxy
Class-map (qos): bigbang
police cir 5 bc 30 pir 20 be 40
Service-policy (qos) input: bronze
Class-map (qos): silver
police cir 5 bc 100 pir 30 be 100
488
Quality of service