Netgear XCM8810 Chassis Hardware Installation Guide - Page 460

NETGEAR 8800 Chassis Switch CLI Manual Usage Guidelines Note: If an application requests specific packets on a specific port, those packets are not affected by the disable flooding ports command. You might want to disable egress flooding to do the following: • enhance security • enhance privacy • improve network performance This is particularly useful when you are working on an edge device in the network. The practice of limiting flooded egress packets to selected interfaces is also known as upstream forwarding. Note: If you disable egress flooding with static MAC addresses, this can affect many protocols, such as IP and ARP. 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. 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 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 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 of the NETGEAR 8800 family of switches. The default behavior for the NETGEAR 8800 family of switches is enabled egress flooding for all packet types. Example The following command disables egress flooding on slot 4, ports 5 and 6 on a NETGEAR 8800 switch: disable flooding all_cast port 4:5-4:6 460 | Chapter 10. FDB Commands