3Com 4500 PWR 26-Port Configuration Manual page 217

18
MAC Address Table Management
Wh n configur e ing MAC address table management, go to these sections for information you are
interested in:
Overview
Configuring MAC Address Table Management
Displaying MAC Address Table Information
Config uration Example
This chapter describes the management of static, dynamic, and blackhole MAC address entries. For
in formation about the management of multicast MAC address entries, refer to Multicast Operation.
Overview
Introd uction to MAC Address Table
An Ethernet switch is mainly used to forward packets at the data link layer, that is, transmit the packets
to the corresponding ports according to the destination MAC address of the packets. To forward packets
quickly, a switch maintains a MA
address-to-forwarding port association. Each
Destination MAC address
ID of the VLAN which a port belongs to
Forwarding egress port num
Wh n forwarding a packet, an Ethernet switch adopts one of the two forwarding methods based upon e
the MAC address table entries.
Unicast forwarding: If the destination MAC address carried in the packet is included in a MAC
address table entry, the switch forwards the packet through the forwarding egress port in the entry.
Broadcast forwa
MAC address table, the switch broadcasts the packet to all ports except the one receiving the
packet.
Introd uction to MAC Address Learning
MAC address table entries can b
Manual configuration
MAC address learning
C address table, which is a Layer 2 address table recording the MAC
bers on the local switch
rding: If the destination MAC address carried in the packet is not included in the
e updated and maintained through the following two ways:
entry in a MAC address table contains the following fields:
18-1