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Catalyst 3750 SwitchSoftware Configuration Guide
OL-8550-09
Chapter21 Configuring Flex Links and the MAC Address-Table Move Update Feature
Configuring Flex Links and the MAC Address-Table Move Update
Configuring Flex Links
Beginning in privileged EXEC mode, follow these steps to configure a pair of Flex Links:
To disable a Flex Link backup interface, use the no switchport backup interface interface-id interface
configuration command.
This example shows how to configure an interface with a backup interface and to verify the
configuration:
Switch# configure terminal
Switch(conf)# interface gigabitethernet1/0/1
Switch(conf-if)# switchport backup interface gigabitethernet1/0/2
Switch(conf-if)# end
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/0/1 GigabitEthernet1/0/3 Active Standby/Backup Up
Vlans Preferred on Active Interface: 1-3,5-4094
Vlans Preferred on Backup Interface: 4
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify the interface, and enter interface configuration
mode. The interface can be a physical Layer 2 interface or
a port channel (logical interface). The port-channel range
is 1 to 48.
Step3 switchport backup interface interface-id Configure a physical Layer 2 interface (or port channel)
as part of a Flex Link pair with the interface. When one
link is forwarding traffic, the other interface is in standby
mode.
Step4 end Return to privileged EXEC mode.
Step5 show interfaces [interface-id] switchport backup Verify the configuration.
Step6 copy running-config startup config (Optional) Save your entries in the switch startup
configuration file.