16-bit ASN kludge
Edward B. Dreger
eddy+public+spam at noc.everquick.net
Fri Dec 3 16:48:06 UTC 2004
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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