Configuring QoS Congestion Management
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 26-17
Profile with a Mix of Strict Priority and WRR
Unicast queues configured as Strict Priority will inherit behavior from the Strict Priority model, and
unicast queues configured as WRR will inherit behavior from the WRR model. Multicast queues will
always follow the behavior that the corresponding unicast queues are following. For example:
• If UC7 and UC6 are Strict Priority, then the MC3 (priority 6 and 7) will also use Strict Priority.
• If UC7 and UC6 are Weighted Round Robin, then MC3 (priority 6 and 7) will also use Weighted
Round Robin. The weight of MC3 will be the average of the weights for UC6 and UC7.
For DCB profile ETS behavior, where a Traffic Class (TC) can have more than one priority, multicast
queues will follow the corresponding unicast queue behavior. For example:
DCB Profile 1:
TC 0 Priority 0 -3)
TC 1 Priority 4 -5)
TC 2 Priority 6 -7)
TC 0 has UC0 through UC3 in Round Robin, so MC0 (priority 0 and 1) and MC1 (priority 2 and 3) will
also participate in the Round Robin behavior of TC 0.
Multicast/Unicast Traffic Distribution for the OmniSwitch 6900-Q32 and
OmniSwitch 6900-X72
The multicast and unicast queue mapping for the OmniSwitch 6900-Q32 and OmniSwitch 6900-X72 is as
follows:
There are additional multicast queues in both switches. As a result, traffic distribution is based on the
priority value regardless of whether the traffic is multicast or unicast. In other words, multicast traffic with
priority 1 and unicast with priority 1 are given equal distribution.
Queues Priority Precedence
UC7, MC7 7 Highest
UC6, MC6 6
UC5, MC5 5
UC4, MC4 4
UC3, MC3 3
UC2, MC2 2
UC1, MC1 1
UC0, MC0 0 Lowest
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