1-4
Load sharing mechanism
A ring network may carry traffic of multiple VLANs. Smart link can forward traffic of different VLANs in
different smart link groups, thus implementing load sharing.
To implement load sharing, you can assign a port to multiple smart link groups (each configured with
different protected VLANs), making sure that the state of the port is different in these smart link groups.
In this way, traffic of different VLANs can be forwarded along different paths.
You can configure protected VLANs for a smart link group by referencing MSTIs.
Smart Link Configuration Task List
Complete the following tasks to configure Smart Link:
Task Remarks
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
Configuring a Smart
Link Device
Enabling the Sending of Flush Messages Optional
Configuring an
Associated Device
Enabling the Receiving of Flush Messages Required
z 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 1-1
are two examples of smart link devices.
z 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 1-1 are examples of
associated devices.
Configuring a Smart Link Device
Configuration Prerequisites
z 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.
z Disable STP and RRPP on the ports you want to add to the smart link group, and make sure that
the ports are not member ports of any aggregation group.
A loop may occur on the network during the time when STP is disabled but Smart Link has not yet
taken effect on a port.
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