Re: OT: prefix length used by backbone routers

[Randy Bush <randy@psg.com>]

>> are you asking if the forwarding look-up is longest match on 64 or 128
>> bits?  i think the latter is mandatory.  we do allow allocation of /128s.
> Can't backbone routers assume 48 bit look-up for best effort unicast
> forwarding?

given the current addressing and routing model, i don't think so

> Though who want to sell value-added (such as MPLS) routers may
> disagree, it is important for low-cost high-speed Internet.

i suspect the days of forwarding lookup speed problems are past us

randy