Configuring Monitor Link; Overview - HP 5130 EI Series Configuration Manual

Configuring Monitor Link

Overview

Monitor Link associates the state of downlink interfaces with the state of uplink interfaces in a monitor link
group. When Monitor Link shuts down the downlink interfaces because of an uplink failure, the
downstream device changes connectivity to another link.
Figure 27 Monitor Link application scenario
A monitor link group contains uplink and downlink interfaces. An interface can belong only to one
monitor link group.
Uplink interfaces are the monitored interfaces. The state of a monitor link group is associated with
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the state of its member uplink interfaces. When a monitor link group contains no uplink interface or
all the uplink interfaces are down, the monitor link group goes down. As long as one member
uplink interface is up, the monitor link group stays up.
Downlink interfaces are the monitoring interfaces. The state of the downlink interfaces is associated
•
with the state of the monitor link group. When the state of the monitor link group changes, the state
of its member downlink interfaces changes to be consistent with the group state.
As shown in
Port 1 and Port 2 of Device B form a monitor link group.
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Port 1 and Port 2 of Device D form another monitor link group.
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• Port 1 is an uplink interface on both devices, and Port 2 is a downlink interface on both devices.
Figure 27:
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