[c-nsp] Rate-Limiting on Single Interface based on destination IP / AS

[Noble]

Hi:
 
I am looking for a solution that can size / control the bandwidth based on
destination IP range / AS. Any suggestion will be highly appreciated.
 
My  scenario is..
 
Customer R1===Ethernet 10/100 Link ===ISP 6509 10/100/1000 Port===ISP
Core-Gig====Uplink-STM1===Internet
                                                                        ||
Customer R1===Ethernet 10/100 Link =======||
 
 
 
As u can see above I have a 10/100/1000 mbps interface connected to the
customer A R1 on Ethernet link. Also my Customer B is using the same option
to interface with 6509.
 
My customers bought 15 mbps internet bandwidth from me. Rest of the
bandwidth (100mbps -15 mbps=85mbps) is to be used for traffic between the
local ISPs i.e.. Customer A and Customer B. How do I segregate / control
this?  
 
Thanks,
 
Noble