BGP Question - Advertising class C assigned from ISP 1 through ISP 2
I have a customer with a single router dual-homed to ISP 1 and ISP 2 (leaving the names of the ISP's out). The customer has their own BGP ASN number assigned by ARIN, but they do not have their own class C assigned from ARIN.
ISP 1 assigned a class C from their address space to the customer. We would like to use ISP 2 as the primary path (it has more bandwidth) and ISP 1 as the secondary path. As-Prepends have been setup accordingly to accomplish this task.
Customer can get to all of their sites across the internet through ISP 2 except one location. ISP 2 states that since the class C is allocated to ISP 1, they need to get their own Class C from ARIN.
Below is a url that links to a document from Sprint published in 2001. On page 8 it shows a scenario (Case 1 and Case 2), whereby this practice is acceptable. The class C from ISP 1 would be a "traffic magnet" through ISP 2, but this outcome is fine by us.
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