84 SMART LINK C ONFIGURATIONSmart Link Overview As shown in Figure 256, dual-uplink networking is widely applied currently.Usually, spanning tree protocol (STP) is used to implement link redundancy backupin the network. However, STP is not suitable for users with a high demand forconvergence time. Smart Link can achieve active/standby link redundancy backupand fast convergence to meet the user demand.Smart Link has the following features:■ Active/standby backup for dual-uplink networking■ Simple configuration and operationBasic Concepts in SmartLinkSmart Link groupA Smart Link group consists of two member ports, one master port and one slaveport. Normally, only one port (master or slave) is active, and the other port isblocked, that is, in the standby state. When link failure occurs on the port in activestate, the Smart Link group will block the port automatically and turn standbystate to active state on the blocked port.Figure 256 Network diagram of Smart LinkIn Figure 256, Ethernet2/0/1 and Ethernet2/0/2 on Switch A are two memberports of a Smart Link group.Master portThe master port can be either an Ethernet port or a manually-configured or staticLACP aggregation group. For example, you can configure Ethernet2/0/1 of switchA in Figure 256 as the master port through the command line.Switch ASwitch B Switch CEth1 /0/1 Eth1/0/2uplink uplinkMaster Port Slave Port
