From: Jason Sinclair (sinclairj@xxxxxxxxxxxxxxx)
Date: Fri Aug 03 2001 - 00:51:28 GMT-3
All,
Please disregard the last post.
Thanks,
Jason Sinclair
Team Leader - NSG
POWERTEL Limited
Level 11, 55 Clarence Street, SYDNEY
Phone: 61-2-8264-3820
Mobile: 0416 105 858
jasons@powertel.net.au
-----Original Message-----
From: Dan [mailto:dp595@optonline.net]
Sent: Friday, 3 August 2001 13:43
To: ccielab@groupstudy.com
Subject: BGP no-export vs. local-as
I got the following info from CCO:
(http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_
r/iprprt2/1rdbgp.htm#xtocid142330
excerpt:
no-export-Routes with this community are sent to peers in
other
sub-autonomous systems within a confederation. Do not
advertise this route
to an EBGP peer. External systems are those outside the
confederation. If
there is no confederation, an external system is any EBGP
peer.
local-as -Send this route to peers in other sub-autonomous
systems within
the local confederation. Do not advertise this route to an
external system.
----------------------------------------------------------------------------
----------------------------------------------------------------------------
---------
They both say the route gets advertised to peers in other
sub-autonomous
systems.
But, I have always understood it as:
A) If a route is tagged with the "no-export" community, it
will not be
advertised to any EBGP peers, whether they be confederation
peers or not.
B) If a router is tagged with the "local-as" community, it
will not be
advertised to EBGP peers, except EBGP peers within the same
confederation.
Please correct me if I'm wrong, but I believe this
information on CCO
regarding "no-export" contradicts itself.
Dan Pontrelli
Customer Installation/Support Engineer - Verio/NTT
CCNP, MCSE, CNA
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