Users Guide

• 0 to 40000000—kilobits per second (kbps)
• 0 to 40000 — megabits per second (mbps)
In S5148F-ON, consider the following guidelines for providing the bandwidth rates:
• Queue level shaping
• Set the bandwidth rate of shaping in multiples of 11 Mbps, with the minimum bandwidth rate starting from 11 Mbps. If you congure
a value other than the multiples of 11, the rate is mapped to the nearest multiple of 11. For example, if you set the bandwidth rate to
12 Mbps, the value is congured as 11 Mbps in the system.
• Congure the burst size for buer allocation as 256*(8n-1), where the value of n ranges from 1 to 256 bytes.
• Interface Level
• When you apply shaping on interfaces, congure the peak rate in multiples of 25 Mbps, starting from 25 Mbps. If you congure a
value other than the multiples of 25, the rate is mapped to the nearest multiple of 25. For example, if you set the bandwidth rate to
42 Mbps, the value is congured as 25 Mbps in the system.
NOTE: In the S5148F-ON platform, only peak rate and peak burst size are applied to the Hardware.
Policy-based shaping
OS10(config)# policy-map type queuing master
OS10(conf-pmap-queuing)# class first
OS10(conf-pmap-c-que)# shape min mbps 11 max mbps 44
View policy-map
OS10(conf-pmap-c-que)# do show policy-map
Service-policy(queuing) output: master
Class-map (queuing): first
shape min mbps 11 max mbps 44
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.
NOTE
: In S5148F-ON, the rate-limit includes inter-frame gap and preamble bytes as part of policer calculation. As a result, there
might be a deviation from the congured policer rate-limit and the policer output.
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]}
450
Quality of service