Re: Bgp update source loopback

Hi Alexei,

I have tested this thing in a non MPLS environment. I think as long as you
have NLRI reachibilty to the loopback it does not creates any inconsistency,
but maybe i could be wrong.

-Raghav

On Sat, May 15, 2010 at 10:03 PM, Alexei Monastyrnyi <alexeim73_at_gmail.com>wrote:

> Technically speaking sure, but that would introduce inconsistency and
> certain level of unpredictability of this peering behavior. As many folks
> have pointed out, peering from IP address of physical interface vs loopback
> involves peer IP address reachbility and in case of MPLS environments also
> proper labes assignments.
>
> The easiest way to understand is to play around with it on Dynamips, real
> quick setup of 2 to 4 routers would do.
>
> HTH
> A
>
>
> On 5/16/2010 2:28 PM, Raghav Bhargava wrote:
>
> Since we all are talking about BGP update source loopback.
>
> Experts,
>
> Can we have below command on one Router and not on the other one and form
> ibgp peering..:)
>
> neighbor x.x.x.x update-source-loopback x
>
>
> Raghav
>
> On Sat, May 15, 2010 at 9:13 PM, Mustafa Yadav <mustafa.yadav_at_gmail.com> <mustafa.yadav_at_gmail.com>wrote:
>
>
>
> Good be a good troobleshooting question if it is not configured.
>
> On Sun, May 16, 2010 at 6:55 AM, Scott Morris <swm_at_emanon.com> <swm_at_emanon.com> wrote:
>
>
>
> If you decide not to, there will be lots of extra work in order to get
>
>
> your
>
>
> next-hop information correlating with your label path information....
>
>
>
>
> Mustafa Yadav wrote:
>
> Hi All,
>
> I see i-bgp configuration in all mpls labs done by using update-source
> loopback.Why do we have to use loopback as a source?If we do not use I
>
>
> think
>
>
> ibgp also come up.Is not that right?
>
>
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-- 
Warm Regards
Raghav
Blogs and organic groups at http://www.ccie.net