Address Table Commands 2797Address Table CommandsDell Networking N2000/N3000/N4000 Series SwitchesStatic MAC Filtering allows the administrator to add a number of unicast ormulticast MAC addresses directly to the forwarding database. This is typicallya small number relative to the total size of the database. Associated with eachstatic MAC address is a set of source ports, a set of destination ports andVLAN information.Any packet with a particular static MAC address in a particular VLAN isadmitted only if the ingress port is in the set of source ports; otherwise, thepacket is dropped. On the egress side, the packet, if admitted, is sent out of allthe ports that are in the set of destination ports.Upon ingress, each packet's destination MAC address is compared against theforwarding database. If the address is not in the table, the packet is flooded toall other ports in the VLAN. If the address is in the table, then it is checked tosee if it has been defined as a filter. If the MAC address is not defined as afilter, then the packet is forwarded.If the specific destination MAC address is defined as a filter, then the ingressport number is compared to the set of source ports listed for the address. Ifthe port of ingress is not in the set of source ports, then the packet isimmediately discarded. If the ingress port is a member of the set of sourceports, then the packet is admitted.For packets admitted because of a MAC filter match only, the followingadditional steps are performed. Note that all other egress processing remainsunchanged. At the egress port, if the destination port number is in the set ofdestination ports, the packet is forwarded. If the destination port is not in theset of destination ports, then the packet is discarded.Static entries are never aged and can only be removed by user command.
