Trunking VLANs across Aironet 1400 bridge

Randall White · ‎10-18-2004

Hi All,

I am having problems trunking VLANs across some 1400 bridges. I have a campus LAN w/ 1 root bridge and 4 non-root bridges. There are Cat 2950 and 2940 switches at each bridge. I have set up the VLANs on the sub-interfaces on the bridges, and set the switchports to trunking, but the trunk isn't coming up. Here's some config sections:

Bridge:

interface Dot11Radio0

no ip address

no ip route-cache

!

ssid tsunami

vlan 1

max-associations 10

authentication open

guest-mode

infrastructure-ssid

!

interface Dot11Radio0.1

encapsulation dot1Q 1 native

no ip route-cache

bridge-group 1

bridge-group 1 spanning-disabled

!

interface FastEthernet0

no ip address

no ip route-cache

duplex auto

speed auto

!

interface FastEthernet0.1

encapsulation dot1Q 1 native

no ip route-cache

bridge-group 1

bridge-group 1 spanning-disabled

(similar output for VLAN 10)

Switch:

interface FastEthernet0/7

switchport mode trunk

no ip address

spanning-tree portfast

!

So... what do I need to do to pass both VLANs across the wireless bridge?

Will a trunk form between the switch and bridge, or transparently between the two switches? Does the bridge pass VTP info?

Thanks, Randy

thomas.chen · ‎10-26-2004

Yes, you can trunk VLANs across AP1410 for more details refer this document,

http://www.cisco.com/univercd/cc/td/doc/product/wireless/aero1400/br1410/brscg/p11vlan.htm

dewman03 · ‎10-26-2004

"Switch:

interface FastEthernet0/7

switchport mode trunk

no ip address

spanning-tree portfast

!

"

When you set up the trunk ports on the switches, you must specify allowed vlans as well as the native vlan.

Example:

interface FastEthernet0/7

switchport mode trunk

switchport trunk allowed vlan 1, 10

switchport trunk native vlan 1

no ip address

spanning-tree portfast

The bridges should create a trankparent trunk link between the 2 switches. Also, any vlans that you want to exist on the switches, must be a defined vlan on the bridges. When setting the encryption to be used for the bridging, remember that all the other vlans are encrypted the same as the native vlan, so just set encryption on the native vlan.