3Com Switch 7750 Configuration Guide

84
SMART LINK CONFIGURATION
Smart 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 backup
in the network. However, STP is not suitable for users with a high demand for
convergence time. Smart Link can achieve active/standby link redundancy backup
and fast convergence to meet the user demand.
Smart Link has the following features:
■ Active/standby backup for dual-uplink networking
■ Simple configuration and operation
Basic Concepts in Smart
Link
Smart Link group
A Smart Link group consists of two member ports, one master port and one slave
port. Normally, only one port (master or slave) is active, and the other port is
blocked, that is, in the standby state. When link failure occurs on the port in active
state, the Smart Link group will block the port automatically and turn standby
state to active state on the blocked port.
Figure 256 Network diagram of Smart Link
In Figure 256, Ethernet2/0/1 and Ethernet2/0/2 on Switch A are two member
ports of a Smart Link group.
Master port
The master port can be either an Ethernet port or a manually-configured or static
LACP aggregation group. For example, you can configure Ethernet2/0/1 of switch
A in Figure 256 as the master port through the command line.
Switch A
Switch B Switch C
Eth1 /0/1 Eth1/0/2
uplink uplink
Master Port Slave Port