Hi,
You can use "sh ip bgp" it will show you the active and best route to a prefix.
Example:
BGP table version is 5, local router ID is 10.0.33.34
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.0.0 0.0.0.0 0 32768 ?
* 10.2.0.0 10.0.33.35 10 0 35 ?
* 10.0.0.0 10.0.33.35 10 0 35 ?
*> 192.168.0.0/16 10.0.33.35 10 0 35 ?
the route with *> in front of it is the best active route.
http://www.cisco.com/en/US/docs/ios/12_3/iproute/command/reference/ip2_s2g.html#wp1039007
HTH
Reza