enable flooding ports

enable flooding [all_cast | broadcast | multicast | unicast] ports [port_list | all]


Enables egress flooding on one or more ports. You can further identify the type of packets to flood on the specified ports.

Syntax Description

all_cast Specifies enabling egress flooding for all packets on specified ports.
broadcast Specifies enabling egress flooding only for broadcast packets.
multicast Specifies enabling egress flooding only for multicast packets.
unicast Specifies enabling egress flooding only for unknown unicast packets.
port_list Specifies one or more ports or slots and ports.
all Specifies all ports on the switch.


Enabled for all packet types.

Usage Guidelines

Use this command to re-enable egress flooding that you previously disabled using the disable flooding ports command.

The following guidelines apply to enabling and disabling egress flooding:
  • Disabling multicasting egress flooding does not affect those packets within an IGMP membership group at all; those packets are still forwarded out. If IGMP snooping is disabled, multicast packets are not flooded.
  • Egress flooding can be disabled on ports that are in a load-sharing group. If that is the situation, 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 learning is independent of egress flooding. FDB learning and egress flooding can be enabled or disabled independently.
  • Disabling unicast or all egress flooding to a port also stops packets with unknown MAC addresses to be flooded to that port.
  • Disabling broadcast or all egress flooding to a port also stops broadcast packets to be flooded to that port.

You can disable egress flooding for unicast, multicast, or broadcast MAC addresses, as well as for all packets on the ports. The default behavior is enabled egress flooding for all packet types.


The following command enables unicast flooding on ports 13-17 on a switch:

enable flooding unicast port 13-17


This command was first available in ExtremeXOS 11.2.

Platform Availability

This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, and 5520 series switches.