[j-nsp] How does multihop eBGP work?

[Keegan Holley]

Can you elaborate?  This isn't really much info to go on.  multi-hop BGP is
pretty simple though.  In fact it's pretty much identical to the way most
configure iBGP (sans mpls).  You peer based on an address that is not
directly connected to you.  Once that is established you start receiving
routes with a next hop of that "not-so-directly-connected" address that you
are peered with.  When you begin to send packets to that peer AS may need to
traverse routers that do not have the BGP routes from the remote peer so you
will need to use an IGP, static routes or PFM to tell the intermediate
routers how to reach the prefixes advertised from the multi-hop peer.  The
cleanest way may be to use iBGP or simply redistribute the routes into your
IGP if it is a small enough number.


2011/6/24 Mike Williams <mike.williams at comodo.com>

> Hey guys,
>
> I've got a situation I think I need multihop bgp for (logical-systems and
> bridge-domains).
> However it bugs me deeply that I don't "get" multihop BGP.
>
> My biggest bugbear is if my multihop-ebgp peer tells me he know the best
> way
> to x.x.x.x, the packets I send towards him must be routed by
> intermediaries,
> will those intermediaries use their tables and "hijack" my packets down
> their
> bits of wet string through 15 other ASs and to the moon and back?
>
> Thanks
>
> --
> Mike Williams
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