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Q
UALITY
OF
S
ERVICE
3-217
Switches and routers along the path can use class information to prioritize
the resources allocated to different traffic classes. The manner in which an
individual device handles traffic in the DiffServ architecture is called
per-hop behavior. All devices along a path should be configured in a
consistent manner to construct a consistent end-to-end QoS solution.
Notes: 1. You can only configure one rule per Class Map. However, you
can include multiple classes in a Policy Map.
2. You must create a Class Map before creating a Policy Map.
Configuring Quality of Service Parameters
To create a service policy for a specific category or ingress traffic, follow
these steps:
1. Use the “Class Map” to designate a class name for a specific category
of traffic.
2. Edit the rules for each class to specify a type of traffic based on an
access list, a DSCP or IP Precedence value, or a VLAN.
3. Set an ACL mask to enable filtering for the criteria specified in the
Class Map. (See “Configuring an IP ACL Mask” on page 3-113 or
“Configuring a MAC ACL Mask” on page 3-115.)
4. Use the “Policy Map” to designate a policy name for a specific manner
in which ingress traffic will be handled.
5. Add one or more classes to the Policy Map. Assign policy rules to each
class by “setting” the QoS value to be assigned to the matching traffic
class. The policy rule can also be configured to monitor the average
flow and burst rate, and drop any traffic that exceeds the specified rate,
or just reduce the DSCP service level for traffic exceeding the specified
rate.
6. Use the “Service Policy” to assign a policy map to a specific interface.