Scheduling

Scheduling is the process that determines which traffic is forwarded when multiple QoS (Quality of Service) 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.

Limitation

  • 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