Restrictions and guidelines
An interface can be assigned to only one monitor link group.
To avoid undesired down/up state changes on the downlink interfaces, configure uplink interfaces before you configure downlink interfaces.
If you have configured an interface as the downlink interface of a monitor link group, do not configure its subinterfaces as the uplink interfaces of any monitor link group. Otherwise, the Monitor Link operation might be interrupted.
The state of subinterfaces is associated with the state of the interface. Do not add the interface and its subinterfaces to the same monitor link group. Otherwise, the monitor link group performance might be affected.
If you have configured a Selected port of an aggregation group as the downlink interface of a monitor link group, do not configure an Unselected port of the aggregation group as the uplink interface of the monitor link group.
Do not add an aggregate interface and its member ports to the same monitor link group.
You can configure member interfaces for a monitor link group in monitor link group view or interface view. Configurations made in these views have the same effect. The configuration is supported by the following interfaces:
Layer 2 Ethernet interfaces and Layer 2 aggregate interfaces.
Layer 3 Ethernet interfaces/subinterfaces and Layer 3 aggregate interfaces/subinterfaces.