From: Chirag Arora (carora1977@gmail.com)
Date: Sun Jul 16 2006 - 10:10:26 ART
It will be 224.0.0.0 14.255.255.255. If you go by logic you need to match
224, 226,228,230,232,234,236,238.
224- 1110 0000
226- 1110 0010
228- 1110 0100
230- 1110 0110
232- 1110 1000
234- 1110 1010
236- 1110 1100
238- 1110 1110
So if you see only the 2nd, 3rd and 4th bits are changing. In ACLs, 1 is
dont care and 0 is must stay. As a result the inverse mask is 0000 1110
which gives 14.255.255.255.
cheers
chirag
On 7/16/06, Russell Kelly (rukelly) <rukelly@cisco.com> wrote:
>
> Anyone know why this one-liner ACL doesn't seem to work if I want to
> announce only even first octet MC addresses from the candidate and map
> with the same ACL on the mapper -- permitting these only??
>
> access-list 30 permit 224.0.0.0 14.255.255.255
>
> Seems I have to put the class C's in specifically on both --- ?? ---
> anyone run across this before??
>
> Cheers
> Russ
>
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-- Chirag
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