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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.
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.
Creating a monitor link group
Ste
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.
You can assign a Layer 2 Ethernet port or Layer 2 aggregate interface to a monitor link group as a
member port.
A port can be assigned to only one monitor link group.
Configure uplink ports prior to downlink ports to avoid undesired down/up state changes on the
downlink ports.
In monitor link group view
To configure member ports for a monitor link group in monitor link group view:
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