Configuring A Smart Link Device; Configuration Prerequisites - H3C S5120-EI Series Operation Manual

Uplink traffic-triggered MAC address learning, where update is triggered by uplink traffic. This
mechanism is applicable to environments with devices not supporting smart link, including devices
of other vendors'.
Flush update where a Smart Link-enabled device updates its information by transmitting flush
messages over the backup link to its upstream devices. This mechanism requires the upstream
devices to be capable of recognizing smart link flush messages to update its MAC address
forwarding entries and ARP/ND entries.
To keep traffic forwarding stable, the master port that has been blocked due to link failure does not take
over immediately upon its recovery. Instead, link switchover will occur at next link switchover.
Role preemption mechanism
As shown in Figure
Device C is the standby link. Once GE1/0/1 fails, GE1/0/2 takes over to forward traffic. During this
period, if the smart link group is configured with role preemption, GE1/0/1 takes over to forward traffic as
soon as it recovers.
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.

Configuring a Smart Link Device

To use Smart Link on a device, you must configure the device with a smart link group and transmit
control VLAN for flush message transmission. Device C and Device E in
Smart Link devices.

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.
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.
Configuring a Smart Link Device
Follow these steps to configure a smart link device:
Enter system view
Create a smart link group and enter
smart link group view
1-1, the link on GE1/0/1 of Device C is the active link, and the link on GE1/0/2 of
To do... Use the command...
system-view
smart-link group group-id
1-3
Figure 1-1 are two examples of
Remarks
—
Required