Re:[isp-bgp] BGP multihop

[vdadlaney@...]

Hi All,

Just to add I believe that you need a specific route to the ip you specify in the neighbor statement. Usually EBGP is configured via a directly connected link to the neighbor but in cases where the neighbor might not be directly connected you would have to specify ebgp multiphop since the ttl on EBGP is 1 by default. You cannot use a default route for the peering relationship. It has to be specific. Please correct me if I am wrong. Thanks

Regards,

Vikram


> > Michal.Grzybczyk@vattenfall.pl wrote:
> > > I have problem with multihop configured with eBGP.
> > > Is it normal that I need configured routes on 'intermediate'
> > > router to each destination networks I've received through BGP ?
> 
> To each desitnation network?? NO. To recap what Pete said, the
> static/IGP routes are required pointing to  eBGP routers, so that they
> can establish peering sessions and exchange routes...
> 
> >
> > BGP requires that its neighbors be reachable through non-BGP routes.
> > Otherwise, if/when the routes disappear, it can never determine
> > reachability to the neighbor without reachability to the neighbor.
> >
> > The alternative is static or dynamic IGP routes to the neighbor.
> >
> > pt
> >
> 
> --
> Nonchalantly yours
> GobbledeGeek
> [Everything but Gobbledegook.. !!]
> 




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