Cisco Catalyst 3560-X Command Reference Manual page 906

switchport backup interface
Related Commands
Catalyst 3750-X and 3560-X Switch Command Reference
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This example shows how to configure the Gigabit Ethernet interface as the MMU primary VLAN:
Switch# configure terminal
Switch(conf)# interface gigabitethernet1/0/1
Switch(conf-if)# switchport backup interface gigabitethernet1/0/2 mmu primary vlan 1021
Switch(conf-if)# end
You can verify your setting by entering the show interfaces switchport backup privileged EXEC
command.
Command
show interfaces [interface-id]
switchport backup
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Chapter 2 Catalyst 3750-X and 3560-X Cisco IOS Commands
Description
Displays the configured Flex Links and their status on the switch or
for the specified interface.
OL-21522-02