QoS behaviors in a traditional stack

QoS profile restrictions

In a stacking topology, quality profiles for qosp7 cannot be configured. If an attempt is made to configure a profile for qosp7, the system ignores the configuration.

Note: This applies only when the device is operating in stacking mode. It does not apply to standalone devices.

QoS behavior for trusting Layer 2 (802.1p)

By default, Layer 2 trust is enabled. Because priority 7 is reserved for stacking control packets, any ingress data traffic with priority 7 is mapped to internal hardware queue 6. All other priorities are mapped to their corresponding queues.

QoS behavior for trusting Layer 3 (DSCP)

When the trust dscp mode is enabled, packets arriving with DSCP values 56 to 63 are mapped to internal hardware queue 6. All other DSCP values are mapped to their corresponding internal hardware queues.

QoS behavior on port priority and VLAN priority

Port priority has a higher precedence than the 802.1p priority examination. If port priority is set to 7, all incoming traffic is mapped to internal hardware queue 6.

When stacking is not enabled on a device, all priorities are mapped to their corresponding queues without restrictions.

QoS behavior for 802.1p marking

By default, 802.1p marking is not enabled in a traditional stack. Outgoing tagged traffic is not marked based on the hardware queue into which ingress traffic was classified. 802.1p marking can be achieved using ACL. For configuration syntax, rules, and examples of QoS marking, refer to the "QoS options for IP ACLs" section in the Ruckus FastIron Security Configuration Guide.