31-1
C
HAPTER
31
C
LASS
OF
S
ERVICE
C
OMMANDS
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 31-1 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
31-1
Priority (Layer 3 and 4) Maps TCP ports, IP precedence tags, or IP
DSCP tags to class of service values
31-8
Table 31-2 Priority Commands (Layer 2)
Command Function Mode Page
queue mode Sets the queue mode to strict priority or
Weighted Round-Robin (WRR)
GC 31-2
switchport priority
default
Sets a port priority for incoming untagged
frames
IC 31-3
queue bandwidth Assigns round-robin weights to the
priority queues
IC 31-4
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