[c-nsp] eBGP --> OSPF --> eBGP vs eBGP --> iBGP --> eBGP

[Adam Greene]

Hi,

We run BGP to our upstream providers and OSPF on our local backbone. 

We have a customer who will be multihomed and needs us to advertise his IP blocks to us via BGP. 

My question is how best to propagate his AS-PATH prepending to my upstream providers. Is it possible to inject this information into OSPF and then into the eBGP to my upstreams? Or should I plan on establishing iBGP sessions between the backbone router that will be servicing the customer and the routers facing my upstream providers? I assume the latter ....

Thanks,
Adam