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Filtering BGP networks with access list

 
 
jlamanna@gmail.com
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      06-23-2010
Hi,
I currently advertise 4 /24s through BGP.
I have my distribute list set up as an access list:

access-list 110 permit ip xxx.xxx.184.0 0.0.0.255 any
access-list 110 permit ip xxx.xxx.185.0 0.0.0.255 any
access-list 110 permit ip xxx.xxx.186.0 0.0.0.255 any
access-list 110 permit ip xxx.xxx.187.0 0.0.0.255 any

I am trying to turn up a "virtual circuit" with one of my ISPs that
will be routing part of one of these networks to a remote site.
Obviously, because of this, I must stop announcing this network
through BGP with them.

If this network is xxx.xxx.187.48/30, what is the best way to filter
it out of the BGP advertisements?
Can I just add:
access-list 110 deny ip host xxx.xxx.187.48 host 255.255.255.252 to
the beginning of my access list?
Or do I have to do something more complicated?

Thanks.

-- James
 
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Daniel-G
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      06-25-2010
http://www.velocityreviews.com/forums/(E-Mail Removed) said the following on 23/06/2010 02:11:
> Hi,
> I currently advertise 4 /24s through BGP.
> I have my distribute list set up as an access list:
>
> access-list 110 permit ip xxx.xxx.184.0 0.0.0.255 any
> access-list 110 permit ip xxx.xxx.185.0 0.0.0.255 any
> access-list 110 permit ip xxx.xxx.186.0 0.0.0.255 any
> access-list 110 permit ip xxx.xxx.187.0 0.0.0.255 any
>
> I am trying to turn up a "virtual circuit" with one of my ISPs that
> will be routing part of one of these networks to a remote site.
> Obviously, because of this, I must stop announcing this network
> through BGP with them.
>
> If this network is xxx.xxx.187.48/30, what is the best way to filter
> it out of the BGP advertisements?
> Can I just add:
> access-list 110 deny ip host xxx.xxx.187.48 host 255.255.255.252 to
> the beginning of my access list?
> Or do I have to do something more complicated?
>
> Thanks.
>
> -- James

isn't xxx.xxx.187.48/30 included in xxx.xxx.187.0/24 ?

am I dumb?
 
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Daniel-G
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      06-25-2010
Daniel-G said the following on 06/25/2010 03:39 PM:
> (E-Mail Removed) said the following on 23/06/2010 02:11:
>> Hi,
>> I currently advertise 4 /24s through BGP.
>> I have my distribute list set up as an access list:
>>
>> access-list 110 permit ip xxx.xxx.184.0 0.0.0.255 any
>> access-list 110 permit ip xxx.xxx.185.0 0.0.0.255 any
>> access-list 110 permit ip xxx.xxx.186.0 0.0.0.255 any
>> access-list 110 permit ip xxx.xxx.187.0 0.0.0.255 any
>>
>> I am trying to turn up a "virtual circuit" with one of my ISPs that
>> will be routing part of one of these networks to a remote site.
>> Obviously, because of this, I must stop announcing this network
>> through BGP with them.
>>
>> If this network is xxx.xxx.187.48/30, what is the best way to filter
>> it out of the BGP advertisements?
>> Can I just add:
>> access-list 110 deny ip host xxx.xxx.187.48 host 255.255.255.252 to
>> the beginning of my access list?
>> Or do I have to do something more complicated?
>>
>> Thanks.
>>
>> -- James

> isn't xxx.xxx.187.48/30 included in xxx.xxx.187.0/24 ?
>
> am I dumb?

I'd better read twice before answering
yes deny will do it, you saw already I guess

 
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