3Com Switch 7750 Configuration Guide

85
MONITOR LINK CONFIGURATION
Introduction to
Monitor Link
Monitor Link is a collaboration scheme introduced to complement for Smart Link.
It is used to monitor uplink and to perfect the backup function of Smart Link.
A monitor Link consists of an uplink port and one or multiple downlink ports.
When the link for the uplink port of a Monitor Link group fails, all the downlink
ports in the Monitor Link group are forced down. When the link for the uplink
port recovers, all the downlink ports in the group are re-enabled.
Figure 259 Network diagram for a Monitor Link group implementation
As shown in Figure 259, the Monitor Link group configured on the device Switch
A consists of an uplink port (Ethernet2/0/1) and two downlink ports
(Ethernet2/0/2 and Ethernet2/0/3). A member port can be an Ethernet port, static
LACP aggregation group, manual link aggregation group, or Smart Link group. A
Smart Link group can serve as the uplink port only.
Switch A
Eth 1 / 0 / 1
Eth 2/ 0/ 2 Eth 2/ 0 / 3
Uplink
Downlink