Hello JM,

>From my understanding and i am still in Volume 1 :) the first one
is permitting an exact prefix of 0.0.0.0 and an exact prefix length of
0.0.0.0 which leads you to a default route.

As for the second line, since it included the "le" now the prefix length
means differently, it means how many bit in the prefix it has to check.

So if you have :

ip prefix-list ROUTES seq 100 deny 1 <http://0.0.0.0/0>92.168.1.0 /24 le 32


The prefix-list will check the first 24 bits of the prefix with a Mask that
is lower or equal to /32


Thanks for the question.




Regards,


On Tue, Apr 3, 2012 at 10:09 PM, JM NGOK <[email protected]> wrote:

> Hi all,
>
> Please excuse my foolishness but I want to understand which subnets are
> allowed under this prefix-list:
>
>
> ip prefix-list ROUTES description INBOUND-ROUTES
> ip prefix-list ROUTES seq 10 permit 0.0.0.0/0
> ip prefix-list ROUTES seq 999 deny 0.0.0.0/0 le 32
>
> Again excuse me if this is not a CCIE level question. I just have some
> doubts.
>
> Thanks
>
>      Jean-Marie NGOK
>  Senior Network Engineer
>         347 - 559 - 1172
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