If you are still thinking in terms of class C and half class C, you
are not ready to plan BGP multihoming. You _must_ start thinking in
CIDR terms.
>I was told by an ISP that the minimum address aggregation acceptable on the
>Internet is a single class C address space. Is this correct?
No, it is not. It is the minimum allocation of provider-independent
space by registries. A /24, however, may NOT be globally routable.
It doesn't sound like your provider understands multihoming.
>This would
>limit companies that do not require a vast amount of IP address to do any
>failover.
There are large numbers of organizations that multihome without their
own address allocations.
>
>I have a full class C w/ one provider and a half class C (x.x.x.128-254) w/
>another provider and would like to do a multi-home load balancing or a
>primary / backup configuration w/ BGP.
Load balancing and primary/backup are quite different. What is the
problem you are trying to solve? Do you have routers that can take a
full Internet routing table (85,000 or so routes), or do you need a
strategy that reduces the number of routes? On what criteria do you
want to distribute load?
>
>Anyone out there been up against this one?
>
>Mike
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