ASA 5510 - redundant interfaces

Unanswered Question
Jan 16th, 2008


Is it possible to create redundant interface for subinterfaces or is it only available for physical interfaces?

I have one ASA connected to two C3750 which are stacked, and few VLANs that are connected to ASA's subinterfaces via trunk.



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smalkeric Thu, 01/17/2008 - 11:54

As soon as you assign a physical interface as a member interface, all the parameters related to that interface will be cleared, including sub interfaces, security level, nameif,etc... However, if you want to configure sub-interfaces (dot1q), you can do

that on top of the redundant interface(s), not the physical interfaces.In other words, member interfaces need to be physical interfaces which cannot have sub-interfaces underneath.

marko.keca Thu, 01/17/2008 - 23:36

Thanks for the information.

Can you tell me how to configure sub-interfaces on top of the redundant interface. I couldn't find any documentation regarding that type of configuration.

That's the main reason why I taught it isn't possible.

Thanks in advance!

Kind regards,




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