Cisco Catalyst 2960 Command Reference Manual page 382

Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
Table 2-22
Field
Access Mode VLAN
Trunking Native Mode VLAN
Trunking VLANs Enabled
Trunking VLANs Active
Pruning VLANs Enabled
Protected
Unknown unicast blocked
Unknown multicast blocked
Voice VLAN
Appliance trust
This is an example of output from the show interfaces switchport backup command:
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
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
------------------------------------------------------------------------
GigabitEthernet2/0/6
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 switchport backup command. In this example,
VLANs 1 to 50, 60, and 100 to 120 are configured on the switch:
Switch(config)#interface gigabitEthernet 2/0/6
Switch(config-if)#switchport backup interface gigabitEthernet 2/0/8 prefer vlan 60,100-120
When both interfaces are up, Gi2/0/8 forwards traffic for VLANs 60, 100 to 120, and Gi2/0/6 will
forward traffic for VLANs 1 to 50.
Switch#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------
OL-8604-04
show interfaces switchport Field Descriptions (continued)
Active Interface Backup Interface
--------------------------------------------------------------
Fa0/1 Fa0/2
Fa0/3 Fa0/5
Po1 Po2
Backup Interface
GigabitEthernet2/0/8
Backup Interface
Description
Displays the VLAN ID to which the port is configured.
Lists the VLAN ID of the trunk that is in native mode. Lists the
allowed VLANs on the trunk. Lists the active VLANs on the
trunk.
Lists the VLANs that are pruning-eligible.
Displays whether or not protected port is enabled (True) or
disabled (False) on the interface.
Displays whether or not unknown multicast and unknown
unicast traffic is blocked on the interface.
Displays the VLAN ID on which voice VLAN is enabled.
Displays the class of service (CoS) setting of the data packets
of the IP phone.
State
Active Up/Backup Standby
Active Down/Backup Up
Active Standby/Backup Up
State
Active Down/Backup Up
State
Catalyst 2960 Switch Command Reference
show interfaces
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