Verio Decides what parts of the internet to drop

There are numerous instances where that sort of policy would
have blown up large chunks of the net. It's already happened.

Part of the problem is that the Tier-1 guys can't buy bigger
equipment to hold all the routes, either. When Sprint started
this sort of filtering in 206.* I yelled and screamed, thinking
it was foolish. History has proven us wrong. Without it,
we'd be at route announcement levels which would blow up
the available backbone hardware. Plus, without that sort
of selective filtering, accidents can kill things right and left.

I am not sure whether the danger in opening up the B space for
/17 blocks is particularly bad, but lacking a single consistent
policy body with sufficient clue about both the Tier-1 backbone
issues and the address allocation issues, it's hard to fault
any given ISP for insisting on /16s in B space.

-george william herbert
gherbert@crl.com
Disclaimer: I am a CRL end user, not employee, and speak for myself only.

I am not sure whether the danger in opening up the B space for
/17 blocks is particularly bad, but lacking a single consistent
policy body with sufficient clue about both the Tier-1 backbone
issues and the address allocation issues, it's hard to fault
any given ISP for insisting on /16s in B space.

  Sounds good, but what exactly does that mean? Does any end network
capable of justifying a /24 then get a routable chunk, thus blowing up the
tables? What if you could do it based upon traffic generation? That would be
difficult to verify, and the definition for 'large' amounts of traffic is
ever changing.
  So, if we say that a /20 is a sufficiently large amount of space to
get a routable chunk, then they would be able to get it from ARIN anyway,
and we're back to square one.
  In the far term as space becomes scarce we will need to find a solution
to wasted B space, but that is several years out. Perhaps by that time routers
will have so much memory and CPU as to make an extra ~4 million possible routes
negligible.

  Austin