Re: [nsp] eBGP multihop - how to count?

From: chris (chris@chrisland.net)
Date: Thu Jun 20 2002 - 11:44:23 EDT


yup. but it can't explain the case when 2 routers are connected
back-to-back but "ebgp-multihop 2 (or larger)" is still necessary to
bring up BGP with loopbacks.

chris

Stephen Gill wrote:
>
> I believe this directly corelates to the TTL set in the packet. It is
> counted just like the TTL would be when routing packets. IE, decrement
> the TTL by one at every hop.
>
> -- steve
>
> --- chris <chris@chrisland.net> wrote:
> > Dear all,
> >
> > When I have 2 routers connected back-to-back and eBGP peered with
> > their
> > loopbacks, eBGP can only be up with eBGP-multihop >= 2. However,
> > when
> > these 2 routers are connected via another router, eBGP can still be
> > up.
> > E.g.:
> >
> > Router A <--- eth ---> Router X <--- eth ---> Router B
> >
> > eBGP between A and B's loopbacks can be up with eBGP-multihop = 2.
> >
> > Isn't it "3"? How is it calculated?
> >
> > Thanks.
> >
> > Regards,
> > Chris
> >
>
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