QoS for Ruckus ICX stackable devices

Ruckus FastIron units in a traditional stack support QoS.

Units in a stack communicate the stack topology information and other proprietary control information through the stacking links. For more information about stacking links and traditional stack technology, refer to the Ruckus FastIron Stacking Configuration Guide.

In addition to control information, the stacking links also carry user network data packets. In a traditional stack topology, the priority of stacking-specific control packets is elevated above that of data path packets, preventing loss of control packets, and timed retries that affect performance. This prioritization also prevents stack topology changes that may occur if enough stack topology information packets are lost.

Traditional stack technology reserves one QoS profile to provide a higher priority for stack topology and control traffic.

On Ruckus ICX 7450 stacking devices only, Priority 7 multicast traffic is not treated as Strict Priority. Multicast queues in the Ruckus ICX 7450 are limited, so Priority 6 and Priority 7 Multicast traffic is mapped to Multicast Queue 7. Therefore, even if you configure Priority 7 as Strict Priority and Priority 6 as non-Strict, scheduling weight sched_6_wt+sched_7_wt is applied on Multicast Queue 7 so that Priority 7 traffic is not scheduled as Strict. See “User-configurable scheduler profile configuration” for more information on scheduling weights.