IP access-group

[admin_2]

What would happend if "ip access-group 180 in" command on a ethernet interface and access-list 180 is not defined on the router.

My thinking was that in such cases implicit deny will be applied. Surprisingly in my network I could see tons of data flowing on that ethernet interface.

Does it mean implicit permit any.

We are running 12.2(6) IOS on 7200 router

[#2]

No. If you only specify an access group within an interface and there is no access list, there is not anything to deny or permit, unless an access list is specify.