From: Thad Swashesed (gfy.ccie@gmail.com)
Date: Sat Jan 10 2009 - 14:32:46 ARST
The difference is the fourth octet. In this case, the first matches with a
fourth octet of 0, and the second one matches any value in the fourth octet.
In this particular case, the routes received all have 0 for the fourth
octet, so either ACL would match them.
If you needed to match on values other than 0 in the fourth octet, then go
with the second one.
Generally, it is recommended to be as specific as possible. The first one
is more specific.
On Sat, Jan 10, 2009 at 11:14 AM, Carlson guo <carlson.guo@gmail.com> wrote:
> R1 and BB1 is running RIP, BB1 advertising 196.17.1.0/24 - 196.17.16.0/2416
> routes, on R1, I use distribute-list in with ACL standard 99 196.17.4.0
> 0.0.11.0, got the result: 4.0/24, 5.0/24, 6.0/24 and
> 12.0/24,13.0/24,14.0/24,15.0/24 in R1 route table, but when I change the
> ACL
> 99 to 196.17.4.0 0.0.11.255, I got the same result, so which one is
> correct?
> which one is the best practice? Thanks for any input...
>
>
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