R3's BGP Conf:

R3#sh running-config | begin bgp
router bgp 3
 no synchronization
 bgp log-neighbor-changes
 network 172.16.20.0 mask 255.255.255.0
 network 172.16.25.0 mask 255.255.255.0
 neighbor 192.168.2.1 remote-as 3
 neighbor 192.168.2.1 next-hop-self
 neighbor 192.168.10.2 remote-as 2
 neighbor 192.168.10.2 route-map SET-OUTBOUND in
 neighbor 192.168.10.2 route-map SET-INBOUND out
 no auto-summary
!

ip as-path access-list 4 permit ^2 4$
ip as-path access-list 4 permit ^2$
!
access-list 2 permit 172.16.20.0 0.0.0.255
access-list 101 permit ip 11.11.0.0 0.0.255.255 host 255.255.0.0
!         
route-map SET-INBOUND permit 10
 match ip address 2
 set metric 200
!         
route-map SET-INBOUND permit 20
 set metric 300
!         
route-map SET-OUTBOUND permit 10
 match ip address 101
 set local-preference 200
!         
route-map SET-OUTBOUND permit 20
 match as-path 4
 set local-preference 300
!         
R3#sh ip bgp 
BGP table version is 12, local router ID is 172.16.25.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 10.10.10.0/24    192.168.10.2                  300      0 2 4 i
*  11.11.0.0/16     192.168.10.2                  200      0 2 1 i
*>i                 192.168.2.1              0    250      0 2 1 i
*> 12.12.12.0/24    192.168.10.2             0    300      0 2 i
*>i172.16.10.0/24   192.168.2.1              0    100      0 i
*>i172.16.11.0/24   192.168.2.1              0    100      0 i
*> 172.16.20.0/24   0.0.0.0                  0         32768 i
*> 172.16.25.0/24   0.0.0.0                  0         32768 i
*> 192.168.1.0/30   192.168.10.2             0    300      0 2 i

R3#

R4's BGP Conf:

R4#sh run | begin bgp
router bgp 3
 no synchronization
 bgp log-neighbor-changes
 network 172.16.10.0 mask 255.255.255.0
 network 172.16.11.0 mask 255.255.255.0
 neighbor 192.168.2.2 remote-as 3
 neighbor 192.168.2.2 next-hop-self
 neighbor 192.168.11.1 remote-as 2
 neighbor 192.168.11.1 route-map SET-OUTBOUND in
 neighbor 192.168.11.1 route-map SET-INBOUND out
 no auto-summary
!

ip as-path access-list 4 permit ^2 4$
ip as-path access-list 4 permit ^2$
!
access-list 101 permit ip 11.11.0.0 0.0.255.255 host 255.255.0.0
!         
route-map SET-INBOUND permit 10
 set metric 250
!         
route-map SET-OUTBOUND permit 10
 match ip address 101
 set local-preference 250
!         
route-map SET-OUTBOUND permit 20
 match as-path 4
 set local-preference 250
!         
!         

R4's BGP Table

R4#sh ip bgp 
BGP table version is 25, local router ID is 172.16.11.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i10.10.10.0/24    192.168.2.2              0    300      0 2 4 i
*                   192.168.11.1                  250      0 2 4 i
*> 11.11.0.0/16     192.168.11.1                  250      0 2 1 i
*>i12.12.12.0/24    192.168.2.2              0    300      0 2 i
*                   192.168.11.1                  250      0 2 i
*> 172.16.10.0/24   0.0.0.0                  0         32768 i
*> 172.16.11.0/24   0.0.0.0                  0         32768 i
*>i172.16.20.0/24   192.168.2.2              0    100      0 i
*>i172.16.25.0/24   192.168.2.2              0    100      0 i
*>i192.168.1.0/30   192.168.2.2              0    300      0 2 i
*                   192.168.11.1                  250      0 2 i



R1's BGP CONF

router bgp 2
 no synchronization
 bgp log-neighbor-changes
 network 12.12.12.0 mask 255.255.255.0
 neighbor 192.168.1.2 remote-as 2
 neighbor 192.168.1.2 next-hop-self
 neighbor 192.168.10.1 remote-as 3
 neighbor 192.168.13.1 remote-as 4
 no auto-summary



R2's  BGP CONF

router bgp 2
 no synchronization
 bgp log-neighbor-changes
 neighbor 192.168.1.1 remote-as 2
 neighbor 192.168.1.1 next-hop-self
 neighbor 192.168.11.2 remote-as 3
 neighbor 192.168.12.1 remote-as 1
 no auto-summary