It might be not directly related to your request but make sure you know in advance the amount of prefixes to load with BGP with sup720-3BXL as max tcam size is by default set in config=512K. We had an issue where the router crashed because of the number of prefixes reached max tcam 512K (hardware capacity 1M prefixes) using vrf-lite. this can be checked with:
sh mls cef maximum-routes

FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4 + MPLS         - 512k (default)
 IPv6 + IP Multicast - 256k (default)

and  modified with
mls cef maximum-routes ...

Alexandre Durand
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