Filtering BGP updates using ip as-path access-lists

From: Raj (raj.bahad@xxxxxxxxxxxxxx)
Date: Thu Aug 15 2002 - 09:02:16 GMT-3

   
Hi all,

I've come across a scenario for which I require some clarification.

I want to permit only networks originated from AS4, and AS's directly
attached to AS4. I use the following config to meet the requirements,
however I have come across documentation that has achieved the same results
using a slightly different version. I've listed both of them below:

ip as-path access-list 1 permit ^4_

and the other being:

ip as-path access-list 1 permit ^4_[0-9]*$

Could someone please help clarify why one method would be preferred over the
other?

Thanks,

Raj.

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