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NXA-ENET24 - Software Management Guide
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.
Priority Commands (Layer 2)
Configures default priority for untagged frames, sets queue weights, and maps class of service tags to
hardware queues
GVRP and Bridge Extension Commands (Cont.)
Command Function
show garp timer
This command shows the
GARP timers for the selected
interface.
Syntax:
show garp timer [interface]
•interface
ethernet unit/port
unit - Stack unit. (Range: 1-8)
port - Port number. (Range: 1-26)
port-channel channel-id (Range: 1-4)
Default Setting: Shows all GARP timers.
Command Mode: Normal Exec, Privileged Exec
Example:
Console#show garp timer ethernet 1/1
Eth 1/ 1 GARP timer status:
Join timer: 100 centiseconds
Leave timer: 60 centiseconds
Leaveall timer: 1000 centiseconds
Console#
Priority Commands (Layer 2)
Command Function
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 for queues 0 - 3 respectively.
Default Setting: Weighted Round Robin
Command Mode: Global Configuration
Command Usage: You can set the switch to service the queues based on a strict
rule that requires all traffic in a higher priority queue to be processed before lower
priority queues are serviced, or use Weighted Round-Robin (WRR) queuing that
specifies a relative weight of each queue. WRR uses a predefined relative weight
for each queue that determines the percentage of service time the switch services
each queue before moving on to the next queue. This prevents the head-of-line
blocking that can occur with strict priority queuing.
Example: The following example sets the queue mode to strict priority service
mode:
Console(config)#queue mode strict
Console(config)#
show queue mode
This command shows the
current queue mode.
Default Setting: None
Command Mode: Privileged Exec
Example:
Console#show queue mode
Queue mode: wrr
Console#