17.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 four 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.
Command Function
Mode
Page
Layer 2 Priority Commands
switchport priority
Sets a port priority for incoming untagged
IC
3-118
default
frames
queue bandwidth
Assigns round-robin weights to the priority
GC
3-119
queues
queue cos map
Assigns class of service values to the
IC
3-120
priority queues
show queue
Shows round-robin weights assigned to the PE
3-122
bandwidth
priority queues
show queue cos-map Shows the class of service map
PE
3-122
show interfaces
Displays the administrative and
PE
3-77
switchport
operational status of an interface
Layer 3 and 4 Priority Commands
map ip precedence
Enables IP precedence class of service
GC
3-123
mapping
map ip precedence
Maps IP precedence value to a class of
IC
3-124
service
map ip dscp
Enables IP DSCP class of service mapping GC
3-125
map ip dscp
Maps IP DSCP value to a class of service IC
3-126
show map ip
Shows the IP precedence map
PE
3-127
precedence
show map ip dscp
Shows the IP DSCP map
PE
3-128
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