From: a9605355 (a9605355@graduate.hku.hk)
Date: Mon Nov 03 2003 - 06:54:40 GMT-3
Hi Brian,
I've read some Cisco document to use extended ACL to filter routes based on
subnet mask information. I've also successfully use extended ACL to filter
routes, so as far as I know, it's functionality should be similar to
prefix-list.
Would you please explain more about this method and why is it different from
prefix-list ? thanks
regards,
alec
>===== Original Message From "Brian McGahan" <bmcgahan@internetworkexpert.com>
=====
>Alec,
>
> The extended access-list syntax cannot be used in this manner.
>The prefix and prefix-length pair matching with an extended ACL can only
>be applied to BGP. For other applications of this matching, simply use
>a prefix-list.
>
>HTH,
>
>Brian McGahan, CCIE #8593
>bmcgahan@internetworkexpert.com
>
>Internetwork Expert, Inc.
>http://www.InternetworkExpert.com
>Toll Free: 877-224-8987
>Direct: 708-362-1418 (Outside the US and Canada)
>
>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>Of
>> Alec
>> Sent: Sunday, November 02, 2003 3:03 AM
>> To: ccielab@groupstudy.com
>> Subject: RIP filtering /27 prefix
>>
>> If I am asked to ONLY ALLOW all RIP-learned routes with /27 prefix,
>what's
>> the difference between the two ? I expect both of them should achieve
>the
>> same result but unfortunately only the 2nd one works :
>>
>> router rip
>> distribute-list 101 in Ethernet0/0/0.909
>>
>> router rip
>> distribute-list prefix TEST in Ethernet0/0/0.909
>>
>> access-list 101 permit ip any host 255.255.255.224
>> ip prefix-list TEST seq 5 permit 0.0.0.0/0 ge 27 le 27
>>
>> regards,
>> alec
>>
>>
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