3com S7906E 설치 설명서

 

1-1 

When configuring MAC address tables, go to these sections for information you are interested in: 

z 

Overview 

z 

Configuring a MAC Address Table 

z 

z 

MAC Address Table Configuration Example 

 

z 

Currently, interfaces involved in MAC address table configuration can only be Layer 2 Ethernet 

ports and Layer 2 aggregate interfaces. 

z 

This manual covers only the configuration of static, dynamic and blackhole unicast MAC address 

table entries (source and destination). For the configuration of static multicast MAC address table 

entries, refer to Multicast Routing and Forwarding Configuration and IPv6 Multicast Routing and 

Forwarding Configuration in the IP Multicast Volume. 

 

A device maintains a MAC address table for frame forwarding. Each entry in this table indicates the 

MAC address of a connected device, to which interface this device is connected and to which VLAN the 

interface belongs. When forwarding a frame, the device first looks up the MAC address table by the 

destination MAC address of the frame for the outgoing port. If the outgoing port is found, the frame is 

forwarded rather than broadcast. Thus, broadcasts are reduced.  

A MAC address table entry can be dynamically learned or manually configured.  

Usually, a device can populate its MAC address table automatically by learning the source MAC 

addresses of received frames.  

The following is how a device learns a MAC address when it receives a frame from a port, Port A for 

example: 

1)  Check the source MAC address (MAC-SOURCE for example) of the frame. Assume that frames 

with the source MAC address MAC-SOURCE can be forwarded through Port A. 

2)  Look up the MAC address table by the MAC address for a match and do the following: 

z 

If an entry is found for the MAC address, update the entry. 

z 

If no entry is found, add an entry for the MAC address to indicate from which port the frame is 

received.