Nick, As far as I know, as long as you're using private AS numbers to the customer, the announcement to a "real" eBGP peer should automatically be rebranded with your originating AS. I'm not sure if this is because an IGP "origin" is somehow implied (which you have explicit), but I've never seen a situation where announcing a prefix received from a customer via private eBGP resulted in the private portion of the AS path being announced.
This seems to be confirmed here: http://www.cisco.com/warp/public/459/32.html: "If the update has only private AS numbers in the AS_PATH, BGP removes these numbers." Can't see any caveats... Cheers, -- Alex -- Alex Balashov Evariste Systems Web : http://www.evaristesys.com/ Tel : +1-678-954-0670 Direct : +1-678-954-0671 _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/