From: Dan (dp595@xxxxxxxxxxxxx)
Date: Fri Aug 03 2001 - 00:42:55 GMT-3
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.
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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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