Question : BGP on a switch

We run IGPs within our LAN and then redistribute into BGP on our edge routers (into MPLS). I've always wondered: Why and when would you run BGP on a L3 switch? And would it be iBGP or eBGP most likely?

Thanks

Answer : BGP on a switch

This is something I'd do on a high-end layer 3 router/switch.  Good processor and plenty of memory.

I've done the IBGP mesh to allow the core L3 devices pick the best path based upon configuration and availability.

I can't say that I would do this on a core switch.