why ASA does NOT need an ACL to form a OSPF neighborship

Folks,

Dumb question but seems I cant figure it out. How come ASA doesnt need an
ACL to permit protocol 89 on outside interface to for ospf adjacancy?

What is the behind of scene action that it does to for ospf adjacency ?
 Does asa listen to Multicast addresses by default and does not drop them ?

I couldnt find relevant info in show asp to find the answer, appreciate if
someone can guide me on this

Where on CLI I can verify if it listens to multicast ?

Thanks

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Received on Thu Oct 04 2012 - 12:32:00 ART