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function to monitor the uplink ports of the upstream devices. Monitor Link adapts the up/down state of
downlink ports to the up/down state of uplink ports, triggering Smart Link to perform link switchover on
the downstream device.
For more information about Monitor Link, see "Configuring Monitor Link."
Collaboration between Smart Link and CC of CFD
Smart Link cannot sense by itself when faults (for example, unidirectional link, misconnected fibers, and
packet loss) occur on the intermediate devices or network paths, or when faults are cleared. To check the
link status, Smart Link ports must use link detection protocols. When a fault is detected or cleared, the link
detection protocols inform Smart Link to switch over the links.
With the collaboration between Smart Link and the Continuity Check (CC) function of Connectivity Fault
Detection (CFD) configured, CFD notifies the ports of fault detection events on the basis of detection
VLANs and detection ports. A port responds to a continuity check event only when the control VLAN of
the smart link group to which it belongs matches the detection VLAN.
For more information about the CC function of CFD, see "Configuring CFD."
Smart Link configuration task list
A smart link device is a device that supports Smart Link and is configured with a smart link group and a
transmit control VLAN for flush message transmission. Device C and Device D in Figure 22 ar
e two
examples of smart link devices.
An associated device is a device that supports Smart Link and receives flush messages sent from the
specified control VLAN. Device A, Device B, and Device E in Figure 22 ar
e examples of associated
devices.
Complete the following tasks to configure Smart Link:
Task Remarks
Configuring a Smart Link device
Configuring protected VLANs for a smart link
group
Required
Configuring member ports for a smart link group Required
Configuring role preemption for a smart link
group
Optional
Enabling the sending of flush messages Optional
Configuring the collaboration between Smart
Link and CC of CFD
Optional
Configuring an associated device Enabling the receiving of flush messages Required
Configuring a Smart Link device
Configuration prerequisites
• Before configuring a port as a smart link group member, shut down the port to prevent loops. You
can bring up the port only after completing the smart link group configuration.
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