On Mon, 9 Jul 2012, Anurag Bhatia wrote:
I was just looking around and say a major Indian provider Sify (AS9583) is announcing /64s via BGP along with main /32 which is their allocation from APNIC. [snip] Is it simply a misconfiguration or there is some use of announcing /64s along with main /32?
Most of the major carriers I've seen appear to have settled on /48 as the smallest IPv6 prefix they will accept, much like /24 is the smallest IPv4 prefix that most providers will accept. Anything smaller runs the risk of mixed degrees of acceptance. As long as the /64 is part of a larger parent block, there shouldn't be any total loss of connectivity, however the routing to one of those /64 sites could be sub-optimal. Advertising /64s into the global routing table is bad mojo. jms