Consider the loopback as being routed, thus the ttl is decremented
since they are not on the same network. IE. Source IP of the packet
shows up as the loopback IP, not the directly connected interface, and
Dest IP of the packet shows up as the remote loopback IP, not the
directly connected interface.
-- steve
--- chris <chris@chrisland.net> wrote:
> 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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This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:13:48 EDT