Scheduling is the process that determines which traffic is forwarded when multiple QoS components are competing for egress bandwidth. The ExtremeXOS software supports the following scheduling methods:

Scheduling takes place on the egress interface and includes consideration for the color-marking of egress frames and packets. Green-marked traffic has the highest priority and is forwarded based on the scheduling method. When multiple queues are competing for bandwidth, yellow-marked traffic might be dropped or remarked red. Red-marked traffic is dropped when no bandwidth is available. If yellow-marked traffic is forwarded to the egress port rate-shaping component, it can be dropped there if the egress port is congested.


  • Summit X670-G2 and X770 only: In hybrid scheduling (WRR/WDRR,SP), strict priority (use-strict-priority) is allowed only for contiguous queues on the port. Switch displays the folllowing error message when SP is configured on non contiguous queues: Error: strict-priority queues must be contiguous on this platform