Owner's Manual

284 | Chapter 10. FDB
NETGEAR 8800 User Manual
You can use the create fdbentry vlan ports command to create a static FDB entry with a
unicast MAC address and a list of more than one port. Once the static FDB is created, any
ingress traffic with a destination MAC address matching the FDB entry is multicasted to each
port in the specified list. If the FDB entry is the next hop for an IP adjacency, unicast routing
sends the packet to the first port in the list.
Note: When a multiport list is assigned to a unicast MAC address, load
sharing is not supported on the ports in the multiport list.
However, NETGEAR 8800 modules do not support this feature natively using the FDB table.
Instead, for each FDB entry of this type, a series of system ACLs have been installed which
match the specified MAC address and VLAN ID, and override the egress port forwarding list
with the supplied list of ports. Multiple ACLs per FDB are required to handle Layer
2 echo kill
by installing a unique ACL per individual port in the list to send matching traffic to all other
ports in the list.
User-configured ACLs take precedence over these FDB-generated ACL rules, and the total
number of rules is determined by the platform. The hardware ACL limitations for each
platform are described in
Chapter 13, ACLs