[c-nsp] ebgp peer-groups and ASN restrictions

[Anton Smith]

Hi..

On Fri, January 5, 2007 06:24, Brian Turnbow wrote:
>   'Members of an external peer group have different
> autonomous system (AS) numbers.'
> If they have the same AS they will be Internal peer groups
> Same AS = I(nternal)BGP
> Different AS = E(xternal)BGP
>
> No problem to set up a peer group to 2 external RRs that have a different
> AS.
>
> Brian

So it seems I was confused by the wording.

It actually means - Members of an external peer group have different
autonomous system (AS) numbers FROM your ASN.

I took it to mean that all members in the peer group required different
ASNs from each other.

Thanks for the help (I couldn't see any reason for the restriction as I
originally interpreted it).

Regards,
Anton

>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Anton Smith
> Sent: giovedì 4 gennaio 2007 15.38
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] ebgp peer-groups and ASN restrictions
>
> Hi all,
>
> Can someone please tell me if the restrictions mentioned here are in
> effect with recent versions of IOS:
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093fb7.shtml
>
> Specifically 'Members of an external peer group have different
> autonomous system (AS) numbers.'
>
> I would like to define a peer group for peering with two route
> reflectors at an internet exchange - but both have the same ASN.
>
> Also, if this restriction does indeed exist, can someone shed some light
> on why?
>
> Alternatively I am wondering if I can just apply the same peer
> *template* (outgoing policies) to the two neighbours, and rely on bgp
> update-groups to give some efficiency. Update groups are automatically
> generated by the router according to BGP Design and Implementation by
> Randy Zhang and Micah Bartell - page 80.
>
> Any help appreciated.
>
> Regards,
> Anton
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