R1
R1#sh ip int br
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset administratively down down
Serial1/0 172.16.0.1 YES manual up up
R1#sh run | begin bgp
router bgp 500
no synchronization
bgp log-neighbor-changes
neighbor 172.16.0.2 remote-as 500
no auto-summary
R1#sh ip bgp
BGP table version is 5, local router ID is 172.16.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i1.1.1.1/32 172.16.0.2 0 100 0 1000 i
*>i2.2.2.2/32 172.16.0.2 0 100 0 1000 i
*>i3.3.3.3/32 172.16.0.2 0 100 0 1000 i
*>i10.0.0.0/30 172.16.0.2 0 100 0 1000 i
R1#ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#sh ip rou
R1#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 [200/0] via 172.16.0.2, 18:40:39
2.0.0.0/32 is subnetted, 1 subnets
B 2.2.2.2 [200/0] via 172.16.0.2, 18:40:39
3.0.0.0/32 is subnetted, 1 subnets
B 3.3.3.3 [200/0] via 172.16.0.2, 18:40:39
172.16.0.0/30 is subnetted, 1 subnets
C 172.16.0.0 is directly connected, Serial1/0
10.0.0.0/30 is subnetted, 1 subnets
B 10.0.0.0 [200/0] via 172.16.0.2, 18:40:39
R1#tracerout
R1#traceroute 1.1.1.1
Type escape sequence to abort.
Tracing the route to 1.1.1.1
1 172.16.0.2 24 msec 32 msec 20 msec
2 * * *
-------------------------------------------------------------------*******--------------------------------------
R2 :
R2#sh ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset administratively down down
Serial1/0 172.16.0.2 YES manual up up
Serial1/1 192.168.1.1 YES manual up up
router bgp 500
no synchronization
bgp log-neighbor-changes
neighbor 172.16.0.1 remote-as 500
neighbor 172.16.0.1 next-hop-self
neighbor 192.168.1.2 remote-as 1000
R2#sh ip bgp
BGP table version is 13, local router ID is 192.168.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.1/32 192.168.1.2 0 0 1000 i
*> 2.2.2.2/32 192.168.1.2 0 0 1000 i
*> 3.3.3.3/32 192.168.1.2 0 0 1000 i
*> 10.0.0.0/30 192.168.1.2 0 0 1000 i
R2#sh ip bgp summary
BGP router identifier 192.168.1.1, local AS number 500
BGP table version is 13, main routing table version 13
4 network entries using 388 bytes of memory
4 path entries using 144 bytes of memory
1 BGP path attribute entries using 60 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 616 total bytes of memory
BGP activity 27/23 prefixes, 31/27 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
172.16.0.1 4 500 4277 4307 13 0 0 18:43:41 0
192.168.1.2 4 1000 4220 4209 13 0 0 18:43:43 4
R2#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 192.168.1.2, 18:44:13
2.0.0.0/32 is subnetted, 1 subnets
B 2.2.2.2 [20/0] via 192.168.1.2, 18:44:13
3.0.0.0/32 is subnetted, 1 subnets
B 3.3.3.3 [20/0] via 192.168.1.2, 18:44:13
172.16.0.0/30 is subnetted, 1 subnets
C 172.16.0.0 is directly connected, Serial1/0
10.0.0.0/30 is subnetted, 1 subnets
B 10.0.0.0 [20/0] via 192.168.1.2, 18:44:13
192.168.1.0/30 is subnetted, 1 subnets
C 192.168.1.0 is directly connected, Serial1/1
R2#ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/28/44 ms
------------------------------------------------------********------------------------------------------------
R3:
R3#sh ip int br
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset administratively down down
Serial1/0 192.168.1.2 YES manual up up
Serial1/1 unassigned YES manual up down
Serial1/2 unassigned YES unset administratively down down
Serial1/3 unassigned YES unset administratively down down
Serial1/4 unassigned YES unset administratively down down
Serial1/5 unassigned YES unset administratively down down
Serial1/6 unassigned YES unset administratively down down
Serial1/7 unassigned YES unset administratively down down
Loopback0 1.1.1.1 YES manual up up
Loopback1 2.2.2.2 YES manual up up
Loopback2 3.3.3.3 YES manual up up
Loopback5 10.0.0.1 YES manual up up
R3#sh run | begin bgp
router bgp 1000
no synchronization
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
network 2.2.2.2 mask 255.255.255.255
network 3.3.3.3 mask 255.255.255.255
network 10.0.0.0 mask 255.255.255.252
neighbor 192.168.1.1 remote-as 500
no auto-summary
R3#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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
C 2.2.2.2 is directly connected, Loopback1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback2
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected, Loopback5
192.168.1.0/30 is subnetted, 1 subnets
C 192.168.1.0 is directly connected, Serial1/0
R3#sh ip bgp
BGP table version is 5, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.1/32 0.0.0.0 0 32768 i
*> 2.2.2.2/32 0.0.0.0 0 32768 i
*> 3.3.3.3/32 0.0.0.0 0 32768 i
*> 10.0.0.0/30 0.0.0.0 0 32768 i
R3#
R3#
R3#tracer
R3#traceroute 172.16.0.1
Type escape sequence to abort.
Tracing the route to 172.16.0.1
1 * * *
