[c-nsp] as-path access lists

[Alex Foster]

Hi Jim

Essentially, I want to receive more routes than I am at the moment -
unfortunately the 3550 I am using to connect to Level3 will only support
16000 prefixes - and I cant therefore receive all routes - hence the
as-path
Filter - but this is restricting it too much.  Is there any way to
receive partial routes - and then to be selective about them - ie: I
really don't want to receive more than +7000 this should be enough for
me to perform the Load Balancing I am looking for.

Regards

Alex 


-----Original Message-----nce
From: Justin M. Streiner [mailto:streiner at cluebyfour.org] 
Sent: 17 November 2004 15:10
To: Alex Foster
Cc: joshua sahala; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] as-path access lists

On Wed, 17 Nov 2004, Alex Foster wrote:

> I have now put in place an as-path access lists - but am finding Im
only
> getting 600 or so prefixes - is there any way to open this out - Im
> really not sure how to proceed from here so If you have 5 mins Id
> appreciate your help.
>
> This is what I have configured so far
>
> ip as-path access-list 10 permit ^3356$  ---- this is Level3 AS number
>
> route-map Level3 permit 20
> match as-path 10
>
> And this is what I get
>
> Neighbor    V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
> State/PfxRcd
> x.x.x.x     4  3356  651626   44838     8173    0    0 00:08:32
612

That AS path regex tells your router to only accept prefixes that have
one 
and only one occurrence of 3356 in the AS path, and that's it.  I don't 
know exactly how many prefixes level 3 is originating, but 612 sounds 
pretty accurate.

How do you want to open it up?

jms


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