How to anchor a /32 route and advertise it to BGP peer

Hi, guys,

I have a situation that I need your suggestion.

I have a one to one static mapping, say: 172.16.1.1 mapped to 1.2.3.4, I have a BGP session over st0 interface, I want to advertise 1.2.3.4/32 over this BGP peering, how do I anchor this route so BGP will know?

Thanks,