Here is the BGP topology i have created. It was quite challenging. My GNS3 is causing the CPU 100% as soon as I run 5 routers with BGP. Super process intensive. I wonder why firewalls and UTM are being used for the BGP.
Here is the result you should finally have on router 5:
Router#sh 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
O 1.1.1.1 [110/129] via 10.10.5.1, 00:18:09, Serial1/0
3.0.0.0/32 is subnetted, 1 subnets
B 3.3.3.3 [200/0] via 1.1.1.1, 00:00:17
5.0.0.0/32 is subnetted, 1 subnets
C 5.5.5.5 is directly connected, Loopback5
172.10.0.0/24 is subnetted, 1 subnets
B 172.10.0.0 [200/0] via 1.1.1.1, 00:00:17
10.0.0.0/24 is subnetted, 4 subnets
B 10.10.1.0 [200/0] via 1.1.1.1, 00:00:17
B 10.10.2.0 [200/0] via 1.1.1.1, 00:00:18
O 10.10.3.0 [110/128] via 10.10.5.1, 00:18:09, Serial1/0
C 10.10.5.0 is directly connected, Serial1/0
B 200.10.30.0/24 [200/0] via 1.1.1.1, 00:00:20
B 200.10.10.0/24 [200/0] via 1.1.1.1, 00:00:20
=======================================================
R1
show ip route result:
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback1
2.0.0.0/32 is subnetted, 1 subnets
S 2.2.2.2 [1/0] via 10.10.0.2
3.0.0.0/32 is subnetted, 1 subnets
S 3.3.3.3 [1/0] via 10.10.2.2
[1/0] via 10.10.1.2
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/129] via 10.10.3.2, 00:32:28, Serial1/3
172.10.0.0/24 is subnetted, 1 subnets
B 172.10.0.0 [20/0] via 3.3.3.3, 00:26:29
10.0.0.0/24 is subnetted, 5 subnets
C 10.10.0.0 is directly connected, Serial1/0
C 10.10.1.0 is directly connected, Serial1/1
C 10.10.2.0 is directly connected, Serial1/2
C 10.10.3.0 is directly connected, Serial1/3
O 10.10.5.0 [110/128] via 10.10.3.2, 00:32:32, Serial1/3
B 200.10.30.0/24 [20/0] via 2.2.2.2, 00:37:07
B 200.10.10.0/24 [20/0] via 2.2.2.2, 00:37:21
!
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.10.0.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 10.10.1.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
ip address 10.10.2.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/3
ip address 10.10.3.1 255.255.255.0
serial restart-delay 0
!
router ospf 1000
log-adjacency-changes
network 1.1.1.1 0.0.0.0 area 0
network 10.10.3.0 0.0.0.255 area 0
!
router bgp 1000
no synchronization
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 2000
neighbor 2.2.2.2 ebgp-multihop 2
neighbor 2.2.2.2 update-source Loopback1
neighbor 3.3.3.3 remote-as 3000
neighbor 3.3.3.3 ebgp-multihop 2
neighbor 3.3.3.3 update-source Loopback1
neighbor 5.5.5.5 remote-as 1000
neighbor 5.5.5.5 update-source Loopback1
neighbor 5.5.5.5 next-hop-self
no auto-summary
!
ip http server
!
ip route 2.2.2.2 255.255.255.255 10.10.0.2
ip route 3.3.3.3 255.255.255.255 10.10.1.2
ip route 3.3.3.3 255.255.255.255 10.10.2.2
!
========================================
r2
!
!
interface Loopback2
ip address 2.2.2.2 255.255.255.255
!
interface Loopback3
ip address 200.10.30.1 255.255.255.0
!
interface Loopback4
ip address 200.10.40.1 255.255.255.0
!
interface Loopback10
ip address 200.10.10.1 255.255.255.0
!
interface Loopback11
ip address 200.10.20.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.10.0.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router bgp 2000
no synchronization
bgp log-neighbor-changes
network 200.10.10.0
network 200.10.30.0
neighbor 1.1.1.1 remote-as 1000
neighbor 1.1.1.1 ebgp-multihop 2
neighbor 1.1.1.1 update-source Loopback2
no auto-summary
!
ip http server
!
ip route 1.1.1.1 255.255.255.255 10.10.0.1
!
=============================================
r3
!
interface Loopback3
ip address 3.3.3.3 255.255.255.255
!
interface Loopback10
ip address 172.10.0.1 255.255.255.0
!
interface Loopback11
ip address 172.10.1.1 255.255.255.0
!
interface Loopback12
ip address 172.10.2.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.10.1.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 10.10.2.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router bgp 3000
no synchronization
bgp log-neighbor-changes
redistribute connected route-map fix
neighbor 1.1.1.1 remote-as 1000
neighbor 1.1.1.1 ebgp-multihop 2
neighbor 1.1.1.1 update-source Loopback3
no auto-summary
!
ip http server
!
ip route 1.1.1.1 255.255.255.255 10.10.1.1
ip route 1.1.1.1 255.255.255.255 10.10.2.1
!
!
access-list 10 deny 172.10.1.0 0.0.0.255
access-list 10 deny 172.10.2.0 0.0.0.255
access-list 10 permit any
!
route-map fix permit 10
match ip address 10
!
!
!
========================================================
r4
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.10.3.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 10.10.5.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router ospf 1000
log-adjacency-changes
network 10.10.3.0 0.0.0.255 area 0
network 10.10.5.0 0.0.0.255 area 0
!
ip http server
!
=================================
r5
!
interface Loopback5
ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 10.10.5.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router ospf 1000
log-adjacency-changes
network 5.5.5.5 0.0.0.0 area 0
network 10.10.5.0 0.0.0.255 area 0
!
router bgp 1000
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 1000
neighbor 1.1.1.1 update-source Loopback5
no auto-summary
!
ip http server
!
======================================================
r1 sh ip bgp
Router#sh ip bgp
BGP table version is 10, local router ID is 1.1.1.1
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
r> 3.3.3.3/32 3.3.3.3 0 0 3000 ?
r> 10.10.1.0/24 3.3.3.3 0 0 3000 ?
r> 10.10.2.0/24 3.3.3.3 0 0 3000 ?
*> 172.10.0.0/24 3.3.3.3 0 0 3000 ?
*> 200.10.10.0 2.2.2.2 0 0 2000 i
*> 200.10.30.0 2.2.2.2 0 0 2000 i
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