Cisco ME 3400 Command Reference Manual page 477

Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
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 Gi0/6 goes down, Gi0/8 carries
all VLANs of the Flex Link pair.
Switch#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------
GigabitEthernet0/6
Vlans on Interface Gi 0/6:
Vlans on Interface Gi 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 Gi0/6 comes up, then VLANs preferred on this interface are blocked on the peer interface Gi0/8
and forwarded on Gi0/6.
Switch#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------
GigabitEthernet20/6
Vlans on Interface Gi 0/6: 1-50
Vlans on Interface Gi 0/8: 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 gigabitethernet0/1 trunk
Port
Gi0/1
Port
Gi0/1
Port
Gi0/1
Port
Gi0/1
Related Commands Command
switchport access vlan
switchport block
switchport backup interface
switchport mode
switchport mode
private-vlan
switchport private-vlan
OL-9640-10
Backup Interface
GigabitEthernet0/8
Backup Interface
GigabitEthernet0/8
Mode Encapsulation
auto negotiate
Vlans allowed on trunk
1-4094
Vlans allowed and active in management domain
1-4
Vlans in spanning tree forwarding state and not pruned
1-4
Description
Configures a port as a static-access or a dynamic-access port.
Blocks unknown unicast or multicast traffic on an interface.
Configures Flex Links, a pair of Layer 2 interfaces that provide mutual
backup.
Configures the VLAN membership mode of a port.
Configures a port as a private-VLAN host or a promiscuous port.
Defines private-VLAN association for a host port or private-VLAN
mapping for a promiscuous port.
State
Active Down/Backup Up
State
Active Up/Backup Up
Status Native vlan
trunking 1
Cisco ME 3400 Ethernet Access Switch Command Reference
show interfaces
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