H3C Technologies H3C S10500 Series Switches - Manual (Page 128)

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• Downlink ports are the monitoring ports. The state of the downlink ports in a monitor link group
adapts to that of the monitor link group. When the state of a monitor link group changes, the state
of its member downlink ports change accordingly. The state of the downlink ports in a monitor link
group is always consistent with that of the monitor link group.
Uplink/Downlink
The uplink is the link that connects the uplink ports in a monitor link group, and the downlink is the link
that connects the downlink ports.
How Monitor Link works
A monitor link group works independently of other monitor link groups. When a monitor link group
contains no uplink port or when all its uplink ports are down, the monitor link group goes down and
forces all downlink ports down at the same time. When any uplink port goes up, the monitor link group
goes up and brings up all the downlink ports.
NOTE:
H3C does not recommend manually shutting down or bringing up the downlink ports in a monitor link
group.
Configuring Monitor Link
Configuration prerequisites
Make sure that the port is not the member port of any aggregation group or service loopback group.
Creating a monitor link group
Follow these steps to create a monitor link group:
To do… Use the command… Remarks
Enter system view system-view —
Create a monitor link group, and enter
monitor link group view
monitor-link group group-id Required
Configuring monitor link group member ports
You can configure member ports for a monitor link group either in monitor link group view or interface
view. The configurations made in these two views lead to the same result.
In monitor link group view
Follow these steps to configure member ports for a monitor link group in monitor link group view:
To do… Use the command… Remarks
Enter system view system-view —
Enter monitor link group view monitor-link group group-id —