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ASA - Transparent failover pair without STP possible?

Answered Question
Sep 16th, 2013
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Hello,


I’m trying to see if it is possible to introduce two transparent ASA 5520s in an Active/Standby pair between 2 switches that don't currently run any form of STP.

tran_fw.jpg

Does anyone know if this is a supported configuration? I’m aware that if both ASA units thought that they were the master this could introduce a L2 loop but under normal operation would a failover succeed without creating a loop or is STP definitely required to achieve this set-up?


I'm trying to avoid having to use routed mode in this instance as re-numbering the address spaces would be quite difficult for this particular scenario.


Many thanks,

Andy

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Correct Answer
Julio Carvajal Mon, 09/16/2013 - 11:35
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pictuscat Thu, 09/19/2013 - 03:33
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Thanks Julio. I'm going to recommend the routed mode even though it's likely to cause some short-term pain. But it's good to know that transparent mode should be possible if that's not an option.

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