Re: BGP next-hop-self

Hi Malik,

The NHS feature makes the router announce itself as the next-hop for the
prefix being announced.
For example, when a prefix learned via eBGP is announced into your network
using iBGP, you may want to put your router as next-hop for that prefix.
Otherwise, all your network should know how to get to the eBGP peer, because
the next-hop for that prefix is the eBGP peer:

     eBGP peer --- Border Router --- Internal Router

As Carlos said, sometimes it's necessary to configure NHS, and sometimes it
depends on your design. If you dont want to announce into your network the
link between the eBGP peer and your border router, you must use NHS in iBGP.
So the next-hop for the prefixes will be your border router.

http://www.initialdraft.com

On Mon, Mar 7, 2011 at 12:12 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> Couple of places:
>
> MPLS vpn PE: use it or it won't work. If you have BGP as CE protocol or
> vrf network commands, you need the NH to be the PE loopbak for it to
> work.
>
> POB (Plain Old BGP): At your AS border, not to need the neighbour
> address be injected into your IGP. Design decision.
>
> There are others for sure.
> -Carlos
>
> Malik Nouman Ahmad @ 06/03/2011 09:51 -0300 dixit:
>
> Hi,
>>
>> I cannot understand when to you use the BGP next-hop-self. The confusion
>> is
>> for both address-families IPv4 and VPN because if it is not used properly
>> it
>> can cause sub-optimal routing
>>
>> It would be nice if anybody can summarize or refer me to some article
>>
>> Thanks,
>> Malik
>>
>>
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>>
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>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
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Received on Sun Mar 27 2011 - 11:55:45 ART