From: Scott Morris (swm@emanon.com)
Date: Mon Mar 12 2007 - 00:28:18 ART
Other than the idea that ^100$ may be too restrictive if the AS Path is 100
100 100 100...
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
_____
From: Jeff Mullan [mailto:jmullan78@gmail.com]
Sent: Sunday, March 11, 2007 10:40 PM
To: swm@emanon.com
Cc: Cisco certification
Subject: Re: Regexp for BGP
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
<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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