Configuring Monitor Link; Overview - HPE FlexFabric 5700 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 to only one
monitor link group.
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Uplink interfaces are the monitored interfaces. The state of a monitor link group is associated
with 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
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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.
•
Port 1 is an uplink interface on both devices, and Port 2 is a downlink interface on both devices.
A monitor link group works independently of other monitor link groups. When a monitor link group
does not contain any uplink interface or all its uplink interfaces are down, the monitor link group goes
down. It forces all downlink interfaces down at the same time. When any uplink interface comes up,
the monitor link group comes up and brings up all the downlink interfaces.
Figure 27:
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