ASA 5512-X Trunking

[petenixon]

Hi all,

I'm looking for some clarification in reference to trunking on an ASA.

I have an ASA 5512-X with two 3750-X's connected to the inside and outside interfaces and I need to trunk between them. I can set up sub-interfaces and configure the correct vlans on the inside interface but cannot do the same thing on the outside interface (can't have the same vlan on multiple interfaces).

I am positive that this can only be achieved by configuring the ASA in transparent mode but would appreciate some clarification.

Thanks.

[Vibhor Amrodia · Accepted solution]

Hi,

You are correct that this would not be possible in routed mode as Sub-Interface cannot have the same VLAN configured.

Thanks and Regards,

Vibhor Amrodia

[petenixon]

Thanks for the clarification Vibhor.

[Ruben Cocheno]

That is a normal behaviour in route mode.