R3#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.23.3       YES manual up                    up     
Loopback0                  3.3.3.3         YES manual up                    up

R2# sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.12.2       YES manual up                    up     
FastEthernet1/0            10.1.23.2       YES manual up                    up     
Loopback0                  2.2.2.2         YES manual up                    up

R3#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.23.3       YES manual up                    up     
Loopback0                  3.3.3.3         YES manual up                    up     

R1(config)#router bgp 1
R1(config-router)#neighbor 10.1.12.2 remote-as 2     

R2(config)#router bgp 2
R2(config-router)#neighbor 10.1.12.1 remote-as 1
R2(config-router)#neighbor 10.1.23.3 remote-as 3

R3(config)#router bgp 3
R3(config-router)#neighbor 10.1.23.2 remote-as 2

R1#sho ip bgp summary
BGP router identifier 1.1.1.1, local AS number 1
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.1.12.2       4     2       4       4        1    0    0 00:01:33        0

R2#sh ip bgp summary
BGP router identifier 2.2.2.2, local AS number 2
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.1.12.1       4     1       4       4        1    0    0 00:01:41        0
10.1.23.3       4     3       4       4        1    0    0 00:00:38        0

R3# sho ip bgp summary
BGP router identifier 3.3.3.3, local AS number 3
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.1.23.2       4     2       4       4        1    0    0 00:00:50        0

R1(config)#router bgp 1
R1(config-router)#network 1.1.1.1 mask 255.255.255.255

R2(config)#router bgp 2
R2(config-router)#network 2.2.2.2 mask 255.255.255.255

R3(config)#router bgp 3
R3(config-router)#network 3.3.3.3 mask 255.255.255.255

R1#sho ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
C       1.1.1.1 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
B       2.2.2.2 [20/0] via 10.1.12.2, 00:00:48
     3.0.0.0/32 is subnetted, 1 subnets
B       3.3.3.3 [20/0] via 10.1.12.2, 00:00:17
     10.0.0.0/24 is subnetted, 1 subnets
C       10.1.12.0 is directly connected, FastEthernet0/0

R2#sho ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
B       1.1.1.1 [20/0] via 10.1.12.1, 00:01:40
     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
B       3.3.3.3 [20/0] via 10.1.23.3, 00:01:07
     10.0.0.0/24 is subnetted, 2 subnets
C       10.1.12.0 is directly connected, FastEthernet0/0
C       10.1.23.0 is directly connected, FastEthernet1/0

R3#sho ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
B       1.1.1.1 [20/0] via 10.1.23.2, 00:01:48
     2.0.0.0/32 is subnetted, 1 subnets
B       2.2.2.2 [20/0] via 10.1.23.2, 00:01:17
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback0
     10.0.0.0/24 is subnetted, 1 subnets
C       10.1.23.0 is directly connected, FastEthernet0/0

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