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

[Brian Turnbow]

  '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

-----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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