Queuing Mechanisms Objectives
Benefits and Drawbacks of MDRR
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Điều hướng trang này:
Configuring Interface MDRR
Configuring Interface MDRR (cont.)
Configuring Receive MDRR
Benefits
and Drawbacks of MDRR
Benefits
Accurate bandwidth allocation (takes into account the deficit from the previous round as opposed to custom queuing)
Prevents head-of-line blocking in front of
the crossbar switching fabric
Supports low-latency queuing (strict priority and alternate priority)
High
performance
Drawbacks
Limited classification tools (only IP Precedence)
Limited number of classes (only eight)
Supported only on Cisco 12000
Series GSRs
Configuring
Interface MDRR
cos-queue-group
cos-queue-group-name
Router(config)#
Create a queue group template and enter CoS queue group configuration mode.
precedence
precedence
queue {
queue-number
|low-latency}
Router(config-cos-que)#
Map IP Precedence to a queue.
queue
queue-number weight
Router(config-cos-que)#
Set the weight of a queue.
Configuring Interface MDRR (cont.)
tx-cos
cos-queue-group-name
Router(config-if)#
Associate a CoS queue group name with the transmit queues on an interface.
queue low-latency {alternate-priority
weight
|strict-priority}
Router(config-cos-que)#
Specify the type of low-latency queue.
Configuring
Receive MDRR
slot-table-cos
slot-table-name
Router(config)#
Define a slot table name and enter slot table configuration mode.
destination slot {
slot
-
number
|all}
cos-queue-group-name
Router(config-slot-cos)#
Define destination slot parameters for this slot table name.
rx-cos-slot
line-card-number
cos-queue-group-name
Router(config)#
Link a slot-table-cos template to a line card.
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