[76222] in North American Network Operators' Group
16-bit ASN kludge
daemon@ATHENA.MIT.EDU (Edward B. Dreger)
Fri Dec 3 11:48:32 2004
Date: Fri, 3 Dec 2004 16:48:06 +0000 (GMT)
From: "Edward B. Dreger" <eddy+public+spam@noc.everquick.net>
To: nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
Perhaps transit networks should receive 16-bit ASNs. Leaf networks
would use { a special ASN | I'm still brainstorming | who knows } and
carry an "available upstreams" BGP tag for each upstream.
Metrics are calculated for each transit AS. Those metrics are then
combined with <as yet unspecified intelligence in "available upstreams"
tag> for each leaf ASN.
BGP loop detection might present a problem if all leaf ASNs use, say,
16-bit AS65535. If existing allowas-in is too coarse, refer to "32-bit
ASN" BGP attribute for fine-grained control.
In short: I'm trying to think up a mechanism that performs full Dijkstra
calculations _only_ for transit networks, and uses some cheaper version
for the degenerate case of a leaf network.
Eddy
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