Application scenario
Smart Link provides link redundancy and subsecond convergence time in a dual uplink network. As shown in Figure 37, Smart Link is configured on Device C and Device D. The secondary link takes over quickly when the primary link fails.
Figure 37: Dual uplink network diagram
A Smart Link network has the following devices:
Smart Link devices—A Smart Link device has two uplinks. A Smart Link device must be configured with a smart link group and a transmit control VLAN to transmit flush messages. Device C and Device D in Figure 37 are Smart Link devices.
Associated devices—An associated device is an uplink device to which Smart Link devices are connected. An associated device supports Smart Link, and receives flush messages sent from the specified control VLAN. When a primary/secondary link switchover occurs, the associated device updates the MAC address entries and ARP/ND entries according to received flush messages. Device A, Device B, and Device E in Figure 37 are associated devices.