Re: BGP peer conferdations

Hey Christian,

Indeed, when you have a BGP peering between confederations you configure it
basically like eBGP but it acts a bit more like iBGP in that the next hop is
not changed.

On Thu, Jun 23, 2011 at 10:16 AM, Christian Hunter <stasis416_at_gmail.com>wrote:

> The usual BGP rules apply. eBGP TTL=1, AD of 20, modifies next hop,
> etc.. iBGP TTL=225, AD of 200, needs full mesh.. I believe
> confederation-peers do NOT modify next-hop? Can someone confirm this?
> It can get tricky as your running two ASN's on the same gear. For lab,
> you must remember to peer your external neighbors with your external
> ASN not your confederation.
> They can help split your IGP domain, and can help with iBGP split
> horizon issues.
>
>
>
> On Thu, Jun 23, 2011 at 9:51 AM, me you <anunda19_at_gmail.com> wrote:
> > Thank you for the replay. I understand the concept behind confederations;
> > however, is there a difference in peering the neighbors between the AS
> > number or confederation number?
> >
> > On Thu, Jun 23, 2011 at 5:40 PM, Christian Hunter <stasis416_at_gmail.com>
> > wrote:
> >>
> >> If you wanted to use a private cofederation ASN internally or segment
> >> your networks if your an ISP. Maybe my DSL network is in its own
> >> private ASN. And your public ASN facing the world. If gives you
> >> flexibility, and messes with the iBGP next-hop rules in the lab :)
> >>
> >>
> >>
> >> On Thu, Jun 23, 2011 at 8:21 AM, me you <anunda19_at_gmail.com> wrote:
> >> > With BGP conferdations you can peer with either the actual AS number
> or
> >> > the
> >> > Conferdations number. What is the difference with the two.
> >> >
> >> > Example of configs.
> >> >
> >> > R2
> >> > router bgp 2000
> >> > bgp conferdation identifer 100
> >> > bgp conferdation peer 1000
> >> > nei 172.16.23.3 remot 100
> >> >
> >> > R3
> >> > router bgp 1000
> >> > bgp conferdation identifer 100
> >> > bgp conferdation peer 2000
> >> > nei 172.16.23.2 remot 100
> >> > Also works to for
> >> >
> >> > R2
> >> > router bgp 2000
> >> > bgp conferation identif 100
> >> > bgp conferdation peer 1000
> >> > nei 172.16.23.3 remot 1000
> >> >
> >> > R3
> >> > router bgp 1000
> >> > bgp conferdation identifer 100
> >> > bgp conferdation peer 2000
> >> > nei 172.16.23.2 remot 2000
> >> >
> >> >
> >> > Blogs and organic groups at http://www.ccie.net
> >> >
> >> >
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-- 
Regards,
Joe Astorino
CCIE #24347
Blog: http://astorinonetworks.com
"He not busy being born is busy dying" - Dylan
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