Re: BGP peer conferdations

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
>> >
>> >
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Received on Thu Jun 23 2011 - 10:16:45 ART