Date: Wed, 13 Oct 2004 18:43:45 +0000 From: bmanning@vacation.karoshi.com Sender: owner-nanog@merit.edu
or... why do people insist on injecting routes to non-existent things? a route table entry is a route table entry, regardless of the scope.
Is this where you advocate that providers only announce the parts of their assigned blocks that are in use?
seems like a good lead in, so yes - i advocate folks only announce what they use. may play old-hob on the ISP that likes to use some other metric for accepting announcements, (e.g. RIR or other routing registry DB) and will no doubt increase the tension on justification of proxy announcements, but overall, this seems to be a good goal.
First, we do accept prefixes from most ASes based on RIR. Second, we don't simply assign address space sequentially from our assigned spaces. We have an addressing plan that leaves the assignments deliberately sparse to allow for better management and the ability to keep our PA assignments to a site contiguous. To only announce the active space would increase the number of routes we announce by about 80%. If everyone did this, the routing table would increase massively. So would the time to compute the routes which might lead to some really bad instability for some routers.
thanks for letting me rant. :)
Any time, Bill. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634