Cisco Catalyst 3750-X

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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
show interfaces
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 Gi2/0/6 goes down, Gi2/0/8 carries
all VLANs of the Flex Link pair.
Switch#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet2/0/6 GigabitEthernet2/0/8 Active Down/Backup Up
Vlans on Interface Gi 2/0/6:
Vlans on Interface Gi 2/0/8: 1-50, 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 Gi2/0/6 comes up, then VLANs preferred on this interface are blocked on the peer interface
Gi2/0/8 and forwarded on Gi2/0/6.
Switch#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet2/0/6 GigabitEthernet2/0/8 Active Up/Backup Up
Vlans on Interface Gi 2/0/6: 1-50
Vlans on Interface Gi 2/0/8: 60, 100-120
This is an example of out put from the show interfaces switchport backup command when a Flex Link
interface goes down (LINK_DOWN), and VLANs preferred on this interface are moved to the peer
interface of the Flex Link pair. In this example, if interface Gi2/0/6 goes down, Gi2/0/8 carries all
VLANs of the Flex Link pair.
Switch#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet2/0/6 GigabitEthernet2/0/8 Active Down/Backup Up
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
This is an example of output from the show interfaces interface-id trunk command. It displays trunking
information for the port.
Switch# show interfaces gigabitethernet1/0/1 trunk
Port Mode Encapsulation Status Native vlan
Gi1/0/1 auto negotiate trunking 1
Port Vlans allowed on trunk
Gi1/0/1 1-4094
Port Vlans allowed and active in management domain
Gi1/0/1 1-4
Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/1 1-4