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Catalyst 2960 Switch Command Reference
OL-8604-03
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
show interfaces
Appliance trust: none
This is an example of output from the show interfaces switchport backup command:
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
--------------------------------------------------------------
Fa0/1 Fa0/2 Active Up/Backup Standby
Fa0/3 Fa0/5 Active Down/Backup Up
Po1 Po2 Active Standby/Backup Up
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
Table 2-22 show interfaces switchport Field Descriptions
Field Description
Name Displays the port name.
Switchport Displays the administrative and operational status of the port.
In this display, the port is in switchport mode.
Administrative Mode
Operational Mode
Displays the administrative and operational modes.
Administrative Trunking
Encapsulation
Operational Trunking Encapsulation
Negotiation of Trunking
Displays the administrative and operational encapsulation
method and whether trunking negotiation is enabled.
Access Mode VLAN Displays the VLAN ID to which the port is configured.
Trunking Native Mode VLAN
Trunking VLANs Enabled
Trunking VLANs Active
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.
Pruning VLANs Enabled Lists the VLANs that are pruning-eligible.
Protected Displays whether or not protected port is enabled (True) or
disabled (False) on the interface.
Unknown unicast blocked
Unknown multicast blocked
Displays whether or not unknown multicast and unknown
unicast traffic is blocked on the interface.
Voice VLAN Displays the VLAN ID on which voice VLAN is enabled.
Appliance trust Displays the class of service (CoS) setting of the data packets
of the IP phone.
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