[j-nsp] How does multihop eBGP work?

[Joel Jaeggli]

On Jun 24, 2011, at 9:48 AM, Aaron Dewell wrote:

> 
> Sure.  Everything is actually routed hop-by-hop.  As you've observed, that's a serious obstacle to multihop eBGP.
> 
> Most uses I've seen involve crossing a non-BGP router to a customer, and redistributing whatever the customer advertises into their IGP.  Klunky for sure, but it does work.

I have ipv6 ebgp multihop sessions too two providers providers where they didn't want to terminate the session on the pe for whatever reason(I'm assuming it involves software). both links are numbered out of the providers address space so it's in their igp and we simply have a static route pointed at the pe for those sessions. not ideal but it works. you want to adjust your assumptions such that the session doesn't establish itself over another provider if the link goes down.
> Aaron
> 
> On Jun 24, 2011, at 10:33 AM, Mike Williams wrote:
> 
>> 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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> 
> 
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