Hello Shaji
Sorry about that I misunderstood. If you want to use prefix lists and route maps, then you would have to do it this way:
First, you would create a prefix list that matches the subnet you want to filter out:
R1(config)#ip prefix-list MY_LIST permit 10.221.1.0/24
Next, you must reference this in a route-map with which you will deny it:
R1(config)#route-map FILTER_OUT deny 10
R1(config-route-map)#match ip address prefix-list MY_LIST
But remember, there is an implicit deny statement at the end, so at this point, everything will be denied. Thus, we must add another route map statement like so:
R1(config)#route-map FILTER_OUT permit 20
R1(config-route-map)#exit
This statement will permit everything.
Then you must apply this route map to the BGP neighbor you want, in an inbound or outbound direction, depending upon which router’s BGP table you want it to be applied to. Let’s say it’s outbound:
R1(config-router)#neighbor 192.168.12.2 route-map FILTER_OUT out
Now this will filter out the 10.221.1.0/24 subnet but will permit everything else.
I hope this has been helpful!
Laz