Assumptions:
ISP1 - 41.x.82.35/31; AS 1111, terminated on GE0/1
ISP2 - 62.y.36.155/31; AS 2222, terminated on GE0/2
ISP3 - 197.z.233.135/31; AS 3333, terminated on FE0/0/0
NCC LAN - 192.168.20.0/24; AS 6500, terminated on GE0/0

ISP1, ISP2, ISP3, NCC LAN are all directly connected to the BGP ROUTER
No DMZ

—————————————————————————————————————————————————————————————————————————

no aaa new-model
ip subnet-zero
ip cef
!
no ip domain lookup
ip audit po max-events 100
!
!
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
!
interface GigabitEthernet0/0
 desc NCC LAN
 ip address 192.168.20.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!
!
interface GigabitEthernet0/1
 desc ISP1
 ip address 41.x.82.35 255.255.255.254
  ip nat outside
 ip virtual-reassembly
!
!
interface GigabitEthernet0/2
 desc ISP2
 ip address 62.y.36.155 255.255.255.254
  ip nat outside
 ip virtual-reassembly
!
!
interface FastEthernet0/0/0
 desc ISP3
 ip address 197.z.233.135 255.255.255.254
  ip nat outside
 ip virtual-reassembly
!
!
router ospf 6500
 log-adjacency-changes
 passive-interface GigabitEthernet0/1
 passive-interface GigabitEthernet0/2
 passive-interface FastEthernet0/0/0
 network 192.168.20.0 0.0.0.255 area 0
 default-information originate always
!
!
router bgp 6500
 no synchronization
 bgp log-neighbor-changes
 bgp bestpath as-path multipath-relax
 network 41.x.82.34 mask 255.255.255.254
 network 62.y.36.154 mask 255.255.255.254
 network 197.z.233.134 mask 255.255.255.254
 neighbor 41.x.82.34 remote-as 1111
 neighbor 41.x.82.34 route-map ISP-1_IN in
 neighbor 41.x.82.34 route-map ISP-1_OUT out
 neighbor 62.y.36.154 remote-as 2222
 neighbor 62.y.36.154 route-map ISP-2_IN in
 neighbor 62.y.36.154 route-map ISP-2_OUT out
 neighbor 197.z.233.134 remote-as 3333
 neighbor 197.z.233.134 route-map ISP-3_IN in
 neighbor 197.z.233.134 route-map ISP-3_OUT out
 maximum-paths 3
 no auto-summary
!
!
!
ip nat inside source route-map ISP-1_NAT interface GigabitEthernet0/1 overload
ip nat inside source route-map ISP-2_NAT interface GigabitEthernet0/2 overload
ip nat inside source route-map ISP-3_NAT interface FastEthernet0/0/0 overload
ip classless
!
!
ip as-path access-list 10 permit ^$
no ip http server
no ip http secure-server
!
!
ip prefix-list only-default permit 0.0.0.0/0
!
!
ip access-list extended NAT
 permit ip 192.168.20.0 0.0.0.255 any
!
!
route-map ISP-1_IN permit 10
 set local-preference 200
 match ip address prefix only-default
!
route-map ISP-2_IN permit 10
 set local-preference 200
 match ip address prefix only-default
!
route-map ISP-3_IN permit 10
 set local-preference 200
 match ip address prefix only-default
!
!
route-map ISP-1_OUT permit 10
 match as-path 10
 set origin igp
!
route-map ISP-2_OUT permit 10
 match as-path 10
 set origin igp
!
route-map ISP-3_OUT permit 10
 match as-path 10
 set origin igp
!
!
!
route-map ISP-1_NAT permit 10
 match ip address NAT
 match interface GigabitEthernet0/1
!
route-map ISP-2_NAT permit 10
 match ip address NAT
 match interface GigabitEthernet0/2
!
route-map ISP-3_NAT permit 10
 match ip address NAT
 match interface FastEthernet0/0/0
!
!
!
!
alias exec sir sh ip route
alias exec sion sh ip ospf nei
alias exec sien sh ip eigrp n
!
line con 0
line aux 0
line vty 0 4
 login    
!
end