Requirements:

　　 SW4’s e0/0/13 is connected to SW1’s g0/0/19, g0/0/16 is connected to SW2’s g0/0/19, e0/0/13 As the master, e0/0/16 as the slave.

　　 If there is a problem with the e0/0/13 interface of SW4, the traffic can be switched to the e0/0/16 interface. When the failure of the e0/0/13 interface is restored, the traffic will be automatically automatically after 30 seconds Switch back.

　　vlan10 is control-vlan.

Topology:

Configuration:

　　 For SW4, we configure the smart link function, switch the traffic of the e0/0/13 and e0/0/16 interfaces, and optimize the spanning tree function;

interface e0/0/13

 stp disable

interface e0/0/16

 stp disable

smart-link group 1　　#Enable smart link configuration

 restore enable

 port e0/0/13 master

 port e0/0/16 slave

 temr wtr 30

 flush send control-vlan 10　　#Specify control vlan

 smart-link enable

　　 For SW1 and SW2, we also need to close the spanning tree and specify control-vlan

interface g0/0/19

 stp disable

 smart-link flush receive control-vlan 10

interface eth-trunk 1

 smart-link flush receive control-vlan 10

Requirement test:

display smart-link gorup 1

　　 go down manually, sw4 The e0/0/13 port on the upper can be switched normally, and then the e0/0/13 port can be switched back after the e0/0/13 port is up, the delay does not exceed 30s

Knowledge points:

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interface e0/0/13

 stp disable

interface e0/0/16

 stp disable

smart-link group 1　　#Enable smart link configuration

 restore enable

 port e0/0/13 master

 port e0/0/16 slave

 temr wtr 30

 flush send control-vlan 10　　#Specify control vlan

 smart-link enable

interface g0/0/19

 stp disable

 smart-link flush receive control-vlan 10

interface eth-trunk 1

 smart-link flush receive control-vlan 10

display smart- link gorup 1