Cisco IE-3000-8TC Command Reference - Page 587
show interfaces switchport backup, Cisco IE 3000 Switch Command Reference, OL-13019-01,
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Chapter 2 IE 3000 Switch Cisco IOS Commands switchport backup interface OL-13019-01 The following example shows how to configure preferred VLANs: Switch(config)# interface gigabitethernet 1/2 Switch(config-if)# switchport backup interface gigabitethernet 1/1 prefer vlan 60,100-120 You can verify your setting by entering the show interfaces switchport backup privileged EXEC command. In the following example, VLANs 60, and 100 to 120 are configured on the switch: Switch(config)# interface gigabitEthernet 1/2 Switch(config-if)# switchport backup interface gigabitEthernet 1/1 prefer vlan 60,100-120 When both interfaces are up, Gi1/2 forwards traffic for VLANs 1 to 50, and Gi1/1 forwards traffic for VLANs 60 and 100 to 120. Switch# show interfaces switchport backup Switch Backup Interface Pairs: Active Interface Backup Interface State GigabitEthernet1/2 GigabitEthernet1/1 Active Up/Backup Up Vlans Preferred on Active Interface: 1-50 Vlans Preferred on Backup Interface: 60, 100-120 When a Flex Link interface goes down (LINK_DOWN), VLANs preferred on this interface are moved to the peer interface of the Flex Link pair. In this example, if interface Gi1/2 goes down, Gi1/1 carries all VLANs of the Flex Link pair. Switch# show interfaces switchport backup Switch Backup Interface Pairs: Active Interface Backup Interface State GigabitEthernet1/2 GigabitEthernet1/1 Active Down/Backup Up Vlans Preferred on Active Interface: 1-50 Vlans Preferred on Backup Interface: 60, 100-120 When a Flex Link interface comes up, VLANs preferred on this interface are blocked on the peer interface and moved to the forwarding state on the interface that has just come up. In this example, if interface Gi1/2 comes up, VLANs preferred on this interface are blocked on the peer interface Gi1/1 and forwarded on Gi1/2. Switch# show interfaces switchport backup Switch Backup Interface Pairs: Active Interface Backup Interface State GigabitEthernet1/2 GigabitEthernet1/1 Active Up/Backup Up Vlans Preferred on Active Interface: 1-50 Vlans Preferred on Backup Interface: 60, 100-120 The following example shows how to configure multicast fast-convergence on interface Gi1/1: Switch# configure terminal Switch(config)# interface gigabitEthernet 1/1 Switch(config-if)# switchport backup interface gigabitEthernet 1/2 multicast fast-convergence Switch(config-if)# end Cisco IE 3000 Switch Command Reference 2-561