Guidelines for Enabling or Disabling Egress Flooding

The following guidelines apply to enabling and disabling egress flooding:

Egress flooding can be disabled on ports that are in a load-sharing group. In a load-sharing group, the ports in the group take on the egress flooding state of the master port; each member port of the load-sharing group has the same state as the master port.
FDB (forwarding database) learning takes place on ingress ports and is independent of egress flooding; either can be enabled or disabled independently.
Disabling unicast (or all) egress flooding to a port also prevents the flooding of packets with unknown MAC addresses to that port.
Disabling broadcast (or all) egress flooding to a port also prevents the flooding of broadcast packets to that port.
For SummitStack and Summit family switches, the following guidelines apply:
- You can enable or disable egress flooding for unicast, multicast, or broadcast MAC addresses, as well as for all packets on one or more ports.
- Disabling multicasting egress flooding does not affect those packets within an IGMP (Internet Group Management Protocol) membership group at all; those packets are still forwarded out.
- If IGMP snooping is disabled, multicast packets with static FDB entries are forwarded according to the FDB entry.

Published March 2020prev | next