Introduction To Monitor Link - 3Com 7757 Configuration Manual

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Introduction to
Monitor Link
M
ONITOR
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
Uplink
Eth 1 / 0 / 1
Eth 2/ 0 / 3 Eth 2/ 0/ 2
Switch A
Downlink
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.
L C
INK ONFIGURATION