From: Gyo (Gabor.Gyori@xxxxxx)
Date: Wed Jul 03 2002 - 05:59:47 GMT-3
> -----Original Message-----
> From: Ouellette, Tim [mailto:tim.ouellette@eds.com]
> Sent: Wednesday, July 03, 2002 4:51 AM
> To: Gyuri Gabor
> Cc: 'ccielab@groupstudy.com'
> Subject: RE: AS path inverse prepending ?
>
>
> What not just put the "network x.x.x.x" statement into R3 so
> that it'll
> generate the network itself?
In this case one subnet of the network need to exist in the routing table of
R3. It can be done only with static route or a secondary loopback, so we steal
ip address from AS1 range. The other problem is that in this case the real
EBGP update from AS1 is ignored, so thet net becomes unreachable from AS4 and
AS3.
>
> or, another scenario is that you can put AS1 as a private AS
> number and use
> the "neighbor as4-router remote-as x remove-private-as" which
> will remove
> the private-as number from the update that went through r1 to
> r2 to r3 and
> the as-path attribute the the networkA when it gets to R4
> will have r3's AS
> number as the originator.
>
It is the solution I am looking for. The only thing I don't know, how to mark
AS1 as private AS.
Gabor
>
> -----Original Message-----
> From: Gyori Gabor [mailto:Gabor.Gyori@lnx.hu]
> Sent: Tuesday, July 02, 2002 9:59 AM
> To: ccielab@groupstudy.com
> Subject: AS path inverse prepending ?
>
>
> Hi !
>
> Here is an othe problem:
>
> AS1 AS2 AS3 AS4
> R1 ---- R2 --- R3 ---- R4
>
> R1 is advertising network A towards R4.
> The task is to solve that AS4 see network A with AS path does
> not contain
> AS1.
> Configuration has to be done on R3 with the least
> configuration statements.
>
> Do You know any way to do it ?
>
> Gabor
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