H3C Technologies H3C S12500 Series Switches - Manual (Page 132)

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• Downlink ports refer to 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. In this way, 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, while 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 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 recommends not manually shutting down or bringing up the downlink ports in a monitor link group.
Configuring Monitor Link
Make sure the port to be assigned to a monitor link group is not a member port of any aggregation
group.
Creating a monitor link group
Step Command
1. Enter system view. system-view
2. Create a monitor link group and enter monitor link
group view.
monitor-link group group-id
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
To configure member ports for a monitor link group in monitor link group view:
Step Command
1. Enter system view. system-view
2. Enter monitor link group view. monitor-link group group-id
3. Configure member ports for the monitor link
group.
port interface-type interface-number { uplink | downlink }