Cisco Catalyst 3550

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Catalyst 3550 Multilayer Switch Command Reference
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Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
show interfaces
Voice VLAN: none (Inactive)
Appliance trust: none
This is an example of output from the show interfaces gigabitethernet0/1 trunk command. It displays
trunking information for the interface.
Switch# show interfaces gigabitethernet0/1 trunk
Port Mode Encapsulation Status Native vlan
Gi0/1 desirable negotiate not-trunking 1
Port Vlans allowed on trunk
Gi0/1 1
Port Vlans allowed and active in management domain
Gi0/1 1
Port Vlans in spanning tree forwarding state and not pruned
Gi0/1 1
This is an example of output from the show interfaces transceiver properties command. If you do not
specify an interface, the output of the command shows the status on all switch ports:
Switch# show interfaces transceiver properties
Ta b l e 2-21 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.