Multicast Source Pfc On The Omniswitch 6900 - Alcatel-Lucent OmniSwitch 9900 Series Network Configuration Manual

Configuring QoS

Multicast Source PFC on the OmniSwitch 6900

Ingress admission control on the OmniSwitch 6900 does not distinguish between unicast and multicast
traffic. Therefore, a multicast source connected to a port which is PFC aware will react to congestion
thereby pausing transmission. This will affect multicast hosts not in the congestion path.
When a multicast source is attached to a port on a OmniSwitch 6900, make sure that PFC is not enabled
for that particular priority on the ingress. This can be done by configuring the port to use DCP 8 (all
priorities are lossless) or for instance, DCP 1 (priority 4 and 5 are lossless, so multicast may be sent at any
other priority other than priority 4 or 5).
If multicast sources are configured to react to PFC, it will affect subscribers not in the congestion path.
OmniSwitch AOS Release 8 Network Configuration Guide December 2017
Congestion Management
page 26-18