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Re: Splitting a block of Class C's
From: Andy <andy () tigerteam net>
Date: Thu, 24 May 2001 20:13:45 -0500 (CDT)

On Thu, 24 May 2001, Albert Meyer wrote:

At 07:39 PM 5/24/01 -0500, Andy wrote:
It really depends on what you *want* to do. If the /24's you have assigned
to them are non-contiguous then they will want to renumber anyway so they
can advertise an aggregate. If you want to help them out, tell them to go
ahead and advertise the /24's out of your aggregate. Some providers have
stricter filtering, but generally will be reachable through other
providers, so connectivity isn't a big deal. Sprint should be advertising
an aggregate of your IP space which will bring all traffic to their
network. Once it reaches Sprint's network, the more specific routes your
customer is advertising will go to them and the rest will come to you. I
can't see that this would add any additional load to your router.


It may not be that simple.

It never is.

I guess I should have mentioned that I don't 
route anything through Sprint. The only reason I've kept the Sprint circuit 
is to avoid re-IP-ing. Sprint isn't reliable enough to carry customer 
traffic. I do advertise the Sprint route, but I add a couple of hops to 
make sure the traffic goes through my "real" circuit.

I don't think the above details should affect your situation. Your traffic
will get to you the way it usually does while the more specifics will be
routed through Sprint's network to your customer. Just because you pad
your ascount doesn't change my response.


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