Transparent ASA in middle of 802.1q trunk

Unanswered Question
Apr 2nd, 2009

Hi Everyone,

I am hoping someone can provide some advice regarding an ASA in transparent mode sitting in the middle of a .1q trunk.

Scenario is two switches (one routing) has multiple VLAN's setup and then a trunk down to a L2 switch which then has all the end user devices hanging off it. We have a requirement to put an ASA in the middle in transparent mode (and also do IPS) but I cannot for the life of me seem to find a configuration that supports this method.

Any advice/pointers/hints/anything would be most appreciated.

I have this problem too.
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srue Fri, 04/03/2009 - 05:25

You can't configure more than 2 interfaces (or subinterfaces) in transparent mode - ie, no trunking.

If you're looking to control traffic between subnets/vlans you will have to place your ASA differently and possibly do some minor network reconfiguration.


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