From: Huan Pham (pnhuan@yahoo.com)
Date: Tue Nov 25 2008 - 11:35:22 ARST
In addition to what Pavel said, a more typical real-life scenario is when router A and router E are MPLS VPN PE routers using AS-override, which replace private AS of CE (in this case, router B and D) with their own AS. AS PATH loop prevention is lost in that case, and router B & D can accept routes originated from theirown AS, comming back from PE.
Cheers,
--- On Tue, 11/25/08, Pavel Bykov <slidersv@gmail.com> wrote:
> From: Pavel Bykov <slidersv@gmail.com>
> Subject: Re: BGP Backdoor Routes: wrong example
> To: "Bit Gossip" <bit.gossip@chello.nl>
> Cc: "ccielab" <ccielab@groupstudy.com>
> Date: Tuesday, November 25, 2008, 8:37 PM
> Not necessarily. You can use "allowas-in" to
> overcome this BGP limitations.
> Command also specifies the maximum number of times you can
> see your own AS
> in AS_PATH PA.
>
> On Tue, Nov 25, 2008 at 9:56 AM, Bit Gossip
> <bit.gossip@chello.nl> wrote:
>
> > Experts,
> > would you agree that the example given at:
> >
> >
> http://cisco.com/en/US/partner/docs/ios/iproute/configuration/guide/irp_bgp_basic_net_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1056114
> > is not correct because router B will never accept any
> eBGP route
> > originated by router D in virtue of the AS-PATH loop
> detection?
> > Thanks,
> > Bit.
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
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> >
> >
> >
> >
> >
>
>
> --
> Pavel Bykov
> ----------------
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