Cisco Cisco IOS Software Release 12.2(14)S
Frame Relay Queueing and Fragmentation at the Interface
Configuration Tasks
7
Cisco IOS Release 12.2(14)S
To configure the shaping policy in the class-default class, use the following commands beginning in
global configuration mode:
global configuration mode:
Configuring Queueing and Fragmentation on the Frame Relay Interface
To configure low-latency queueing and FRF.12 end-to-end fragmentation on a Frame Relay interface,
use the following commands beginning in global configuration mode:
use the following commands beginning in global configuration mode:
Command
Purpose
Step 1
Router(config)# policy-map policy-map
Specifies the name of the policy map to be
created or modified.
created or modified.
•
Use this command to define the shaping
policy.
policy.
Step 2
Router(config-pmap)# class class-default
Specifies the default class so that you can
configure or modify its policy.
configure or modify its policy.
Step 3
Router(config-pmap-c)# shape [average | peak] mean-rate
[[burst-size] [excess-burst-size]]
(Optional) Shapes traffic to the indicated bit
rate according to the algorithm specified.
rate according to the algorithm specified.
Step 4
Router(config-pmap-c)# service-policy policy-map-name
Specifies the name of a policy map to be
used as a matching criterion (for nesting
traffic policies [hierarchical traffic policies]
within one another).
used as a matching criterion (for nesting
traffic policies [hierarchical traffic policies]
within one another).
•
Use this command to attach the policy
map for the priority queue (the child
policy) to the shaping policy (the parent
policy).
map for the priority queue (the child
policy) to the shaping policy (the parent
policy).
Command
Purpose
Step 1
Router(config)# interface type number
Configures an interface type and enters interface configuration
mode.
mode.
Step 2
Router(config-if)# encapsulation
frame-relay
Enables Frame Relay encapsulation.
Step 3
Router(config-if)# service-policy output
policy-map-name
Attaches a policy map to an output interface, to be used as the
service policy for that interface.
service policy for that interface.
•
If shaping is being used, use this command to attach the
shaping policy (which includes the nested queueing policy) to
the interface.
shaping policy (which includes the nested queueing policy) to
the interface.
•
Interleaving of high-priority frames will not work if shaping
is configured on the interface.
is configured on the interface.
•
If shaping is not being used, use this command to attach the
queueing policy to the interface.
queueing policy to the interface.
Step 4
Router(config-if)# frame-relay fragment
fragment-size end-to-end
Enables fragmentation of Frame Relay frames.
•
To maintain low latency and low jitter for priority queue
traffic, configure the fragment size to be greater than the
largest high-priority frame that would be expected.
traffic, configure the fragment size to be greater than the
largest high-priority frame that would be expected.