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ISCOM2600G-HI (A) Series Configuration Guide
Step 2 Configure interface modes on three switches.
Configure Switch A.
SwitchA(config)#interface gigaethernet 1/1/1
SwitchA(config-gigaethernet1/1/1)#switchport mode trunk
SwitchA(config-gigaethernet1/1/1)#exit
SwitchA(config)#interface gigaethernet 1/1/2
SwitchA(config-gigaethernet1/1/2)#switchport mode trunk
SwitchA(config-gigaethernet1/1/2)#exit
Configure Switch B.
SwitchB(config)#interface gigaethernet 1/1/1
SwitchB(config-gigaethernet1/1/1)#switchport mode trunk
SwitchB(config-gigaethernet1/1/1)#exit
SwitchB(config)#interface gigaethernet 1/1/2
SwitchB(config-gigaethernet1/1/2)#switchport mode trunk
SwitchB(config-gigaethernet1/1/2)#exit
Configure Switch C.
SwitchC(config)#interface gigaethernet 1/1/1
SwitchC(config-gigaethernet1/1/1)#switchport mode trunk
SwitchC(config-gigaethernet1/1/1)#exit
SwitchC(config)#interface gigaethernet 1/1/2
SwitchC(config-gigaethernet1/1/2)#switchport mode trunk
SwitchC(config-gigaethernet1/1/2)#exit
Step 3 Configure priority of spanning tree and interface path cost.
Configure Switch A.
SwitchA(config)#spanning-tree priority 0
SwitchA(config)#interface gigaethernet 1/1/2
SwitchA(config-gigaethernet1/1/2)#spanning-tree extern-path-cost 10
Configure Switch B.
SwitchB(config)#interface gigaethernet 1/1/1
SwitchB(config-gigaethernet1/1/1)#spanning-tree extern-path-cost 10
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