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Changing the Host Outbound Traffic Default Queue Mapping

If you do not want to use the default mapping of host Routing Engine and CPU outbound traffic to queues, you can change the default output queue. You can also change the default DSCP bits used in the type of service (ToS) field of packets generated by the Routing Engine.

Configuring a queue for host outbound traffic maps all traffic that the host generates to one forwarding class (queue). The configuration is global and applies to all host-generated traffic on the switch. Configuring a forwarding class for host outbound traffic does not affect transit or incoming traffic.


Fibre Channel over Ethernet (FCoE) Initialization Protocol (FIP) packets generated by the CPU are always transmitted on the fcoe queue (queue 3), even if you configure a queue for host outbound traffic. This helps to ensure lossless behavior for FCoE traffic. QFabric systems classify FIP control packets into the same traffic class (fcoe) across the Interconnect device (fabric) and the egress Node device.

This does not apply to OCX Series switches, which do not support FCoE.

To change the host outbound traffic egress queue by including the host-outbound-traffic statement at the [edit class-of-service] hierarchy level:

For example, to map host outbound traffic to queue 7 (the network control forwarding class) and set the DSCP code point value to 101010: