4 Command Line Interface

Priority Commands

The commands described in this section allow you to specify which data packets have greater precedence when traffic is buffered in the switch due to congestion. This switch supports CoS with eight priority queues for each port. Data packets in a port’s high-priority queue will be transmitted before those in the lower-priority queues. You can set the default priority for each interface, the relative weight of each queue, and the mapping of frame priority tags to the switch’s priority queues.

Table 4-66 Priority Commands

Command Groups

Function

Page

 

 

 

Priority (Layer 2)

Configures default priority for untagged frames, sets queue weights,

4-206

 

and maps class of service tags to hardware queues

 

Priority (Layer 3 and 4)

Maps TCP ports, IP precedence tags, or IP DSCP tags to class of

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service values

 

Priority Commands (Layer 2)

Table 4-67 Priority Commands (Layer 2)

Command

Function

Mode

Page

 

 

 

 

queue mode

Sets the queue mode to strict priority or Weighted

GC

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Round-Robin (WRR)

 

 

switchport priority default

Sets a port priority for incoming untagged frames

IC

4-207

 

 

 

 

queue bandwidth

Assigns round-robin weights to the priority queues

IC

4-208

 

 

 

 

queue cos-map

Assigns class-of-service values to the priority queues

IC

4-209

 

 

 

 

show queue mode

Shows the current queue mode

PE

4-210

 

 

 

 

show queue bandwidth

Shows round-robin weights assigned to the priority queues

PE

4-210

 

 

 

 

show queue cos-map

Shows the class-of-service map

PE

4-210

 

 

 

 

show interfaces switchport

Displays the administrative and operational status of an

PE

4-152

 

interface

 

 

queue mode

This command sets the queue mode to strict priority or Weighted Round-Robin (WRR) for the class of service (CoS) priority queues. Use the no form to restore the default value.

Syntax

queue mode {strict wrr} no queue mode

•strict - Services the egress queues in sequential order, transmitting all traffic in the higher priority queues before servicing lower priority queues.

•wrr - Weighted Round-Robin shares bandwidth at the egress ports by using scheduling weights 1, 2, 4, 6, 8, 10, 12, 14 for queues 0 - 7 respectively.

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Microsoft ES4625, ES4649 manual Priority Commands Layer
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ES4649, ES4625 specifications

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