Cisco Cisco IOS Software Release 12.2(14)S
Frame Relay Queueing and Fragmentation at the Interface
Configuration Tasks
6
Cisco IOS Release 12.2(14)S
Configuring Class Policy for the Bandwidth Queues
To configure a policy map and create class policies that make up the service policy, use the following
commands beginning in global configuration mode:
commands beginning in global configuration mode:
Configuring the Shaping Policy Using the Class-Default Class
In general, the class-default class is used to classify traffic that does not fall into one of the defined
classes. Even though the class-default class is predefined when you create the policy map, you still have
to configure it. If a default class is not configured, traffic that does not match any of the configured
classes is given best-effort treatment, which means that the network will deliver the traffic if it can,
without any assurance of reliability, delay prevention, or throughput.
classes. Even though the class-default class is predefined when you create the policy map, you still have
to configure it. If a default class is not configured, traffic that does not match any of the configured
classes is given best-effort treatment, which means that the network will deliver the traffic if it can,
without any assurance of reliability, delay prevention, or throughput.
If you configure shaping in addition to queueing on the interface, use the class-default class to configure
the shaping policy. The shaping policy will serve as the parent in a hierarchical traffic policy. The
queueing policy will serve as the child policy. The class-default class is used for the shaping policy so
that all traffic for the entire interface is shaped and a bandwidth-limited stream can be created.
the shaping policy. The shaping policy will serve as the parent in a hierarchical traffic policy. The
queueing policy will serve as the child policy. The class-default class is used for the shaping policy so
that all traffic for the entire interface is shaped and a bandwidth-limited stream can be created.
Command
Purpose
Step 1
Router(config)# policy-map policy-map
Specifies the name of the policy map to be created
or modified.
or modified.
•
The bandwidth queues and the priority queue
use the same policy map.
use the same policy map.
Step 2
Router(config-pmap)# class class-name
Specifies the name of a class to be created and
included in the service policy.
included in the service policy.
•
The class name that you specify in the policy
map defines the characteristics for that class
and its match criteria as configured using the
class-map command.
map defines the characteristics for that class
and its match criteria as configured using the
class-map command.
Step 3
Router(config-pmap-c)# bandwidth bandwidth-kbps
Specifies the amount of bandwidth to be assigned
to the class, in kbps, or as a percentage of the
available bandwidth. Bandwidth must be specified
in kbps or as a percentage consistently across
classes. (Bandwidth of the priority queue must be
specified in kbps.)
to the class, in kbps, or as a percentage of the
available bandwidth. Bandwidth must be specified
in kbps or as a percentage consistently across
classes. (Bandwidth of the priority queue must be
specified in kbps.)
•
The sum of all bandwidth allocation on an
interface cannot exceed 75 percent of the total
available interface bandwidth. However, under
aggressive circumstances in which you want to
configure more than 75 percent of the interface
bandwidth to classes, you can override the 75
percent maximum by using the
max-reserved-bandwidth command.
interface cannot exceed 75 percent of the total
available interface bandwidth. However, under
aggressive circumstances in which you want to
configure more than 75 percent of the interface
bandwidth to classes, you can override the 75
percent maximum by using the
max-reserved-bandwidth command.