Re: BGP NLRI.

Hi James,

If you are talking about passing along the next-hop information, your
two other options could be:

3) Advertising the link prefix into BGP itself. This is common with
SPs and managed customer devices. The link address could be used to
remotely access the managed device, for instance. Advertising the
prefix into BGP avoids introducing potential instabilities into IGP
(flapping links).
4) Rather "ccie lab specific" method - advertising a default route at
the ASBR, or using other, more specific forms of summarization.

Using (2) is a good solution in the situation where you use the same
subnet for all customer links (following the SP example from above),
so that you can conserve IP subnets. Lastly, using (1) might have some
benefits in scenarios such as inter-AS traffic engineering (inter-AS
topology gets exposed to IGP/CSPF).

HTH

-- 
Petr Lapukhov, petr_at_INE.com
CCIE #16379 (R&S/Security/SP/Voice)
CCDE #20100007
Internetwork Expert, Inc.
http://www.INE.com
Toll Free: 877-224-8987
Outside US: 775-826-4344
2010/10/12 Poplawski, James <jpoplawski_at_starkinvestments.com>:
> Good evening,
>
> If I have a router peering with a eBGP and iBGP peers, what are my options to
> pass along the NLRI to the iBGP peers so they can talk with the eBGP.
>
> To my understanding you have two options.
> 1) Advertise the external link into IGP, so your local AS can accept the route
> and add it in the routing table.
> 2) The border router can turn on the set next hop self command.
>
> Am I missing any other options?  I wanted to see if there we're any "ninja"
> commands I was missing.
>
> Thanks,
> JB
>
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