From: Jeff Mullan (jmullan78@gmail.com)
Date: Sun Mar 11 2007 - 23:39:51 ART
for as300, we need to avoid as200 providing transit services to customers of
as100. Based on the diagram below, wont both of the regexp give the same
result ? if we use them outbound towards R3 ?
R1-R2-R3,
R1 = AS 100
R2 = AS 200
R3 = AS 300
On 3/11/07, Scott Morris <swm@emanon.com> wrote:
>
> Read what you are trying to accomplish.
>
> ^100$ means the AS Path ONLY contains AS 100.
> _100$ means the AS Path just ENDS with AS 100 (could be anything before
> it).
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
> #153, CISSP, et al.
> CCSI/JNCI-M/JNCI-J
> IPexpert VP - Curriculum Development
> IPexpert Sr. Technical Instructor
> smorris@ipexpert.com
> http://www.ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jeff
> Mullan
> Sent: Sunday, March 11, 2007 8:28 PM
> To: Cisco certification
> Subject: Regexp for BGP
>
> Folks,
> R1-R2-R3,
>
> R1 = AS 100
> R2 = AS 200
> R3 = AS 300
>
> If the question is, AS200 should not provide transit services to AS300 for
> networks originated from "CUSTOMERS" of AS100. And we are bound to use
> as-path list, would both of the following regexp satisfy the question ?
>
> on R2 outbound towards R3 permit : ^100$ OR;
> on R2 outbound towards R3 permit : _100$
>
> Thanks,
> -JM
>
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