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Unknown-multicast packets meaning in CPCAR

Publication Date:  2018-03-29 Views:  392 Downloads:  0

Issue Description

When setting the committed access rate (CAR) parameters of CPCAR, including the committed information rate (CIR) and committed burst size (CBS) for the unknown-multicast packets, to what specific packets refers this and what packets will be affected by this change?


Unknown multicast flows are those that do not match any entry in the multicast forwarding table or match multicast forwarding entries with an empty outbound interface list.

These flows are not requested by users.

The default method that a switch uses to process unknown multicast flows depends on whether Layer 2 multicast is enabled and which Layer 2 multicast forwarding mode is used:

•If Layer 2 multicast is not enabled on the switch, the switch broadcasts unknown multicast flows in the corresponding VLAN.

•If Layer 2 multicast is enabled, the switch broadcasts unknown multicast flows in the corresponding VLAN in MAC address-based forwarding mode and drops unknown multicast flows in IP address-based forwarding mode.