Monitor Link Configuration; Overview; Terminology - 3Com 4500G Family Configuration Manual

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Monitor Link Configuration

When configuring monitor link, go to these sections for information you are interested in:

Overview

Configuring Monitor Link
Displaying and Maintaining Monitor Link
Monitor Link Configuration Example
Overview
Monitor link is a port collaboration function. Monitor link is usually used in conjunction with Layer 2
topology protocols. The idea is to monitor the states of uplink ports and adapt the up/down state of
downlink ports to the up/down state of uplink ports, triggering link switchover on the downstream device
in time, as shown in
Figure 1-1 Network diagram for monitor link application scenario
Device B

Terminology

Monitor link group
A monitor link group is a set of uplink and downlink ports. A port can belong to only one monitor link
group. As shown in
form a monitor link group. GE1/0/1 on both devices are uplink ports, and GE1/0/2 on both devices are
downlink ports.
Figure 1-1.
Core network
GE1/0/3
Device A
Device C
GE1/0/3
User network
Figure 1-1, ports GE1/0/1 and GE1/0/2 of Device B and those of Device D each
Device D
Uplink
Downlink
Monitor link group
1-1