Mac Address Table Configuration - 3Com 7700 Configuration Manual

8 C 11: S M
HAPTER YSTEM
MAC Address Table
Configuration
ANAGEMENT
way: after receiving a data frame from a port (assumed as port A), the switch
analyzes its source MAC address (assumed as MAC_SOURCE) and considers that
the packets destined at MAC_SOURCE can be forwarded through port A. If the
MAC address table contains the MAC_SOURCE, the switch will update the
corresponding entry, otherwise, it will add the new MAC address (and the
corresponding forwarding port) as a new entry to the table.
The system forwards the packets whose destination addresses can be found in the
MAC address table directly through the hardware and broadcasts. The network
device responds after receiving a broadcast packet and the response contains the
MAC address of the device, which will then be learned and added into the MAC
address table by the Ethernet switch. The consequent packets destined for the
same MAC address can be forwarded directly thereafter. If the MAC address
cannot be found after broadcasting the packet, the switch will drop it and notify
the transmitter that the packet did not arrive at the destination.
Figure 1 The Switch 7700 Forwards Packets According to the MAC Address Table
MACD MACA
Port 1
The Switch 7700 also provides the function of MAC address aging. If the switch
receives no packet for a period of time, it will delete the related entry from the
MAC address table. However, this function has no effect on the static MAC
addresses.
You can configure (add or modify) the MAC address entries manually according to
the actual networking environment. The entries can be static ones or dynamic
ones.
MAC address table management includes:
Set MAC Address Table Entries
■
Disable/Enable Global MAC Address Learning
■
Disable/Enable MAC Address Learning on a Port
■
Set MAC Address Aging Time
■
Setting the Maximum MAC Addresses an Ethernet Port can Learn
■
MAC Address Port
MACA
MACB
MACC
....
MACD
MACD MACA
Port 2
1
1
2
2
....