
20-11
Cisco Security Appliance Command Line Configuration Guide
OL-6721-01
Chapter 20 Applying QoS Policies
Viewing QoS Statistics
The following example establishes a priority queue on interface “outside” (the GigabitEthernet0/1
interface), with the default queue-limit and tx-ring-limit.
hostname(config)# priority-queue outside
The following example establishes a priority queue on the interface “outside” (the GigabitEthernet0/1
interface), sets the queue-limit to 2048 packets, and sets the tx-ring-limit to 256:
hostname(config)# priority-queue outside
hostname(priority-queue)# queue-limit 2048
hostname(priority-queue)# tx-ring-limit 256
Note When priority-queue is enabled, all packets in higher priority queues are totally drained before packets
in lower priority queues can be serviced.
Viewing QoS Statistics
To display the priority-queue statistics for an interface, use the show priority-queue statistics command
in privileged EXEC mode. The results show the statistics for both the best-effort (BE) queue and the
low-latency queue (LLQ). The following example shows the use of the show priority-queue statistics
command for the interface named test, and the command output:
hostname# show priority-queue statistics test
Priority-Queue Statistics interface test
Queue Type = BE
Packets Dropped = 0
Packets Transmit = 0
Packets Enqueued = 0
Current Q Length = 0
Max Q Length = 0
Queue Type = LLQ
Packets Dropped = 0
Packets Transmit = 0
Packets Enqueued = 0
Current Q Length = 0
Max Q Length = 0
hostname#
In this statistical report, the meaning of the line items is as follows:
• “Packets Dropped” denotes the overall number of packets that have been dropped in this queue.
• “Packets Transmit” denotes the overall number of packets that have been transmitted in this queue.
• “Packets Enqueued” denotes the overall number of packets that have been queued in this queue.
• “Current Q Length” denotes the current depth of this queue.
• “Max Q Length” denotes the maximum depth that ever occurred in this queue.
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