Cisco WS-C3560E-48PD-SF Command Reference - Page 347

Chapter 2 Catalyst 3560 Switch Cisco IOS Commands priority-queue priority-queue Use the priority-queue interface configuration command to enable the egress expedite queue on a port. Use the no form of this command to return to the default setting. priority-queue out no priority-queue out Syntax Description out Enable the egress expedite queue. Defaults The egress expedite queue is disabled. Command Modes Interface configuration Command History Release 12.1(19)EA1 Modification This command was introduced. Usage Guidelines When you configure the priority-queue out command, the shaped round robin (SRR) weight ratios are affected because there is one fewer queue participating in SRR. This means that weight1 in the srr-queue bandwidth shape or the srr-queue bandwidth shape interface configuration command is ignored (not used in the ratio calculation). The expedite queue is a priority queue, and it is serviced until empty before the other queues are serviced. Follow these guidelines when the expedite queue is enabled or the egress queues are serviced based on their SRR weights: • If the egress expedite queue is enabled, it overrides the SRR shaped and shared weights for queue 1. • If the egress expedite queue is disabled and the SRR shaped and shared weights are configured, the shaped mode overrides the shared mode for queue 1, and SRR services this queue in shaped mode. • If the egress expedite queue is disabled and the SRR shaped weights are not configured, SRR services the queue in shared mode. Examples This example shows how to enable the egress expedite queue when the SRR weights are configured. The egress expedite queue overrides the configured SRR weights. Switch(config)# interface gigabitethernet0/2 Switch(config-if)# srr-queue bandwidth shape 25 0 0 0 Switch(config-if)# srr-queue bandwidth share 30 20 25 25 Switch(config-if)# priority-queue out 78-16405-05 Catalyst 3560 Switch Command Reference 2-315