North American Network Operators Group|
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Remote sites, aggregates and more-specific routes
We currently announce our entire range as the largest possible aggregates. We are about to add the first site that's a sizable distance away.
The link to the remote site is relatively expensive, so we don't want to have to backhaul traffic between the sites if we can help it.
We seem to have the following options available:
1) Announce the greater aggregate at both ends, and risk having to haul traffic between the sites ourselves.
2) Deaggregate our ranges completely. I don't particulary want to do this, since the predicted 80/20 split in IP address usage across the sites will create a quite a few new routes in the ever growing table.
3) Only announce more-specifics at the remote site, and tag the more specific routes NO-EXPORT if we peer with the AS in both locations.
Am I right in thinking that #3 seems is the best option? AFAICS it adds no new unnecessary routes to the global table (outside of our immediate peers and transit providers) and still keeps unneccessary traffic off of the intersite link.
Are there any options I missed?