Monitor Link Configuration
mechanism of Flex Link.
33.2 Monitor Link Implementation
33.2.1 Basic Concepts in Monitor Link
33.2.1.1 Monitor Link Group
A monitor link group is a set of uplink and downlink ports. Downlink ports adapt to the state
changes of uplink ports.
Figure 33-2 Monitor Link basic concepts
As shown in Figure 33-2, ports GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and
GigabitEthernet 1/0/3 of Switch A form a monitor link group.
1. Uplink Port
An uplink port is a monitored port in a monitor link group. It is a port role specified using
commands. It can be an Ethernet port (electrical or optical), or an aggregate interface.
As shown in Figure 33-2, GigabitEthernet 1/0/1 of Switch A is the only uplink port of the
monitor link group configured on the device.
For a monitor link group that has multiple uplink ports, as long as at least one of its uplink
ports is in the forwarding state, the monitor link group is up. However, when all uplink ports of
the monitor link group fail, the monitor link group goes down, shutting down all the downlink
ports. If no uplink port is specified in a monitor link group, the system considers the monitor
link group’s uplink ports to be faulty, and thus shuts down all the downlink ports in the monitor
link group.
2. Downlink Port
A downlink port is a monitoring port in a monitor link group. It is another port role specified
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