dot1q not working between ap1131 and asa5505

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Feb 20th, 2008
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I try to configure a asa5505 and a AIR-AP1131 to communicate over a trunk (Guest VLAN). A PC connected to the ASA / Vlan3-Port is able to communicate and is able to get an ip address via DHCP from DHCP-server for VLAN3 an the ASA . The AP is connected with a trunk port of the ASA. Connecting wireless to the AP no communication is possible. Trying DHCP und debugging these behavior on the ASA shows incoming DHCP requests and offers. The offers do not arrive at the wireless PC.Do anyone see in the attached configuration files what is the mistake ? Thank you for help.

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rwyates_2 Wed, 02/27/2008 - 13:29
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Why do you have the trunk set up just to allow VLAN 3? If you are going to do that set both ports to Acees and see if you get the request.

The other thing is to create bvi 4 and assign an IP adress to it on the AP based on vlan 3 IP adresses.

glen.grant Wed, 02/27/2008 - 16:10
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On the ASA it appears that you do not have anything setup for vlan 1 . You are only allowing vlan 3 across the trunk and vlan 1 is the native on the ap . Change the ASA to look like the following also get rid of the 100/half duplex setting . Also on the ap make sure you have your default gateway set to .

interface Ethernet0/5

switchport encapsulation dot1q

switchport trunk allowed vlan 1,3

switchport trunk native vlan 1

switchport mode trunk

speed auto

duplex auto


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