I plan on being the 'redundant' link for a customer that has a class C assigned by the primary provider. I planned on just using a /30 to peer and advertise that I'll take his class C and route it to him at the other end of the /30.
The Boss was discussing the project at a recent conference and has told me that someone with ARIN suggested the customer would need a class C from each of the providers. Will I need to allocate an entire class C just to peer and get his primary C routed to him over my network in a failover? Sounds way wrong to me.