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55-1
Chapter 55: Class of Service 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.
Priority Commands (Layer 2)
This section describes commands used to configure Layer 2 traffic priority on the
switch.
Table 55-1 Priority Commands
Command Groups Function Page
Priority (Layer 2) Configures default priority for untagged frames, sets queue weights,
and maps class of service tags to hardware queues
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Priority (Layer 3 and 4) Maps TCP ports, IP precedence tags, or IP DSCP tags to class of
service values
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Table 55-2 Priority Commands (Layer 2)
Command Function Mode Page
queue mode Sets the queue mode to strict priority or Weighted
Round-Robin (WRR)
GC 55-2
switchport priority default Sets a port priority for incoming untagged frames IC 55-3
queue bandwidth Assigns round-robin weights to the priority queues IC 55-4
queue cos-map Assigns class-of-service values to the priority queues IC 55-4
show queue mode Shows the current queue mode PE 55-5
show queue bandwidth Shows round-robin weights assigned to the priority queues PE 55-6
show queue cos-map Shows the class-of-service map PE 55-6
show interfaces switchport Displays the administrative and operational status of an
interface
PE 45-10