On Mon, 08 Dec 2003 21:17:00 GMT, Zefram <zefram@xxxxxxxx> said: > Just wondering, as I have about IPv4 anycast allocations: why can't we > designate a block for microallocations, within which prefix length filters > aren't applied? The number of routes in the DFZ is the same either way; > is there any technical reason why /64 or /128 prefixes, or /32 in IPv4, > can't be used? I'm not a routing person, so apologies if this is somehow > unspeakably dumb. No technical reason - except if you say "I'll filter IPv4 announcements at /28", then you're open to routing table burps if somebody accidentally or intentionally de-aggregates to a very long prefix. Imagine if somebody flubs and withdraws a /12 and announces a /12 worth of /28.... (Yes, this sort of stuff DOES happen.)
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