Q
UALITY
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S
ERVICE
13-6
Creating QoS Policies
This function creates a policy map that can be attached to multiple
interfaces.
Command Usage
• To configure a Policy Map, follow these steps:
- Create a Class Map as described on page 13-2.
- Open the Policy Map page, and click Add Policy.
- When the Policy Configuration page opens, fill in the “Policy Name”
field, and click Add.
- When the Policy Rule Settings page opens, select a class name from
the scroll-down list (Class Name field). Configure a policy for traffic
that matches criteria defined in this class by setting the quality of
service that an IP packet will receive (in the Action field), defining the
maximum throughput and burst rate (in the Meter field), and the
action that results from a policy violation (in the Exceed field). Then
finally click Add to register the new policy.
• A policy map can contain multiple class statements that can be applied
to the same interface with the Service Policy Settings (page 13-10). You
can configure up to 64 policers (i.e., meters or class maps) for each of the
following access list types: MAC ACL, IP ACL (including Standard ACL
and Extended ACL), IPv6 Standard ACL, and IPv6 Extended ACL. This
limitation applies to each switch chip (SMC8824M: ports 1-26,
SMC8848M: ports 1-25, ports 26-50). Also, note that the maximum
number of classes that can be applied to a policy map is 16.
Policing is based on a token bucket, where bucket depth (i.e., the
maximum burst before the bucket overflows) is by specified the “Burst”
field, and the average rate tokens are removed from the bucket is by
specified by the “Rate” option.
• After using the policy map to define packet classification, service tagging,
and bandwidth policing, it must be assigned to a specific interface by a
service policy (page 13-10) to take effect.
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