3Com Switch 8800 Advanced Software V5 Configuration Guide

64 CHAPTER 7: MAC ADDRESS TABLE MANAGEMENT CONFIGURATION
As shown in Figure 21, when forwarding a frame, the device looks up the MAC
address table. If an entry is available for the destination MAC address, the device
forwards the frame directly from the hardware. If not, it does the following:
1 Broadcast the frame.
2 After the frame reaches the destination, the destination sends back a response
with its MAC address. (If no response is received, the frame will be dropped.)
3 Upon receipt of the response, the device adds an entry in the MAC address table,
indicating from which interface the frames destined for the MAC address should
be sent.
4 Forward subsequent frames destined for the same MAC address directly from the
hardware.
5 Discard the frames which cannot reach the destination MAC address.
Figure 21 Forward frames using the MAC address table
Configuring MAC
Address Table
Management
Configuring MAC
Address Entries
Follow these steps to add, modify, or remove entries in the MAC address table:
Port 1 Port 2
MAC address Port
MAC A 1
MAC B 1
MAC C 2
MAC D 2
MAC A
MAC B
MAC C
MAC D
To do... Use the command... Remarks
Enter system view system-view -
Add/modify a MAC address
entry
mac-address { dynamic |
static } mac-address
interface interface-type
interface-number vlan vlan-id
Required
mac-address blackhole
mac-address vlan vlan-id
Enter Ethernet interface view interface interface-type
interface-number
-
Add/modify MAC address
entries under the specified
interface view
mac-address { static |
dynamic } mac-address vlan
vlan-id
Required