H3C Technologies H3C S7500E Series Switches - Manual (Page 127)

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9
Monitor Link Configuration
This chapter includes these sections:
z Overview
z Configuring Monitor Link
z Displaying and Maintaining Monitor Link
z Monitor Link Configuration Example
Overview
Monitor Link is a port collaboration function. Monitor Link usually works together 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 9-1 .
Figure 9-1 Monitor Link application scenario
Device A
Device D Device B
Core network
GE
2/0
/1
GE
2/0
/1
GE
2/0
/1
GE
2/0
/2
GE
2/0
/2
GE2/0/3
GE2/0/3
User network
Uplink
Downlink
Monitor link group
Device C
GE
2/0
/1
GE
2/0
/2
GE
2/0
/2
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 Figure 9-1 , ports GE2/0/1 and GE2/0/2 of Device B and those of Device D each
form a monitor link group. GE2/0/1 on both devices are uplink ports, and GE2/0/2 on both devices are
downlink ports.