Filter
Top Products
If you are using a different Catalyst switch, refer to VLANs (Virtual LANs) & VTP (VLAN Trunking
Protocol) Technical Support for general information on VLANs and Trunking. Refer to the Cisco Product
Support page Catalyst LAN & ATM Switches for configuration information for your switch.
This partial configuration establishes an 802.1Q trunk between the Catalyst 2924 XL and the inter−VLAN
router:
!
interface FastEthernet2/1
description inter−vlan router
switchport trunk encapsulation dot1q
switchport mode trunk
spanning−tree portfast
!
This partial configuration establishes an 802.1Q trunk between the Catalyst 2924 XL and the Cisco Aironet
1200 AP:
!
interface FastEthernet2/3
description AP1200 Port
switchport trunk encapsulation dot1q
switchport mode trunk
spanning−tree portfast
!
This partial configuration establishes an 802.1Q trunk between the Catalyst 2924 XL and the Cisco 7960 IP
Phone:
!
interface FastEthernet2/2
description Fred's 7960
switchport trunk encapsulation dot1q
switchport mode trunk
switchport voice vlan 2
spanning−tree portfast
end
!
Verifying
Issue the show interface fastethernet 2/1 switchport command to verify that the inter−VLAN router port is
configured correctly. In the next sample output, you can see these settings:
The port is in Trunk mode.•
The Trunking Encapsulation is dot1q.•
The Native Mode VLAN is 1.•
2924XL# show interface fastethernet 2/1 switchport
Name: Fa2/1
Switchport: Enabled
Administrative mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Disabled
Access Mode VLAN: 0 ((Inactive))
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Enabled: ALL
Trunking VLANs Active: 1−10