BGP & Tunneling

R1 is in AS1, R5 in AS5.
R2, R3 and R4 are in AS234.

R1 has an eBGP session with R2.
R5 has an eBGP session with R4.

EIGRP is configured inside AS234.
To allow R1 Loopback0 to reach R5 Loopback0, we must establish an iBGP session between R2 ans R4.

We will use a GRE Tunnel between R2 and R4:


R1:
!
hostname r1
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Serial1/0
 ip address 10.150.12.1 255.255.255.0
!
router bgp 1
 no synchronization
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 network 1.1.1.1 mask 255.255.255.255
 neighbor 10.150.12.2 remote-as 234
 no auto-summary
!
ip route 0.0.0.0 0.0.0.0 10.150.12.2
!

On R5:

!
hostname r5
!
interface Loopback0
 ip address 5.5.5.5 255.255.255.255
!
interface Serial1/0
 ip address 10.150.45.5 255.255.255.0
!
router bgp 5
 no synchronization
 bgp router-id 5.5.5.5
 bgp log-neighbor-changes
 network 5.5.5.5 mask 255.255.255.255
 neighbor 10.150.45.4 remote-as 234
 no auto-summary
!
ip route 0.0.0.0 0.0.0.0 10.150.45.4
!


On R3:

!
hostname r3
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface Serial1/0
 ip address 10.150.23.3 255.255.255.0
!
interface Serial1/1
 ip address 10.150.34.3 255.255.255.0
!
router eigrp 1
 network 3.3.3.3 0.0.0.0
 network 10.150.23.3 0.0.0.0
 network 10.150.34.3 0.0.0.0
 no auto-summary
 eigrp router-id 3.3.3.3
!

On R2:

!
hostname r2
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface Tunnel0
 ip address 10.150.24.2 255.255.255.0
 tunnel source 2.2.2.2
 tunnel destination 4.4.4.4
!
interface Serial1/0
 ip address 10.150.12.2 255.255.255.0
!
interface Serial1/1
 ip address 10.150.23.2 255.255.255.0
!
router eigrp 1
 network 2.2.2.2 0.0.0.0
 network 10.150.23.2 0.0.0.0
 no auto-summary
 eigrp router-id 2.2.2.2
!
router bgp 234
 no synchronization
 bgp router-id 2.2.2.2
 bgp log-neighbor-changes
 neighbor 10.150.12.1 remote-as 1
 neighbor 10.150.24.4 remote-as 234
 neighbor 10.150.24.4 update-source Tunnel0
 neighbor 10.150.24.4 next-hop-self
 no auto-summary
!

On R4:

!
hostname r4
!
interface Loopback0
 ip address 4.4.4.4 255.255.255.255
!
interface Tunnel0
 ip address 10.150.24.4 255.255.255.0
 tunnel source 4.4.4.4
 tunnel destination 2.2.2.2
!
interface Serial1/0
 ip address 10.150.34.4 255.255.255.0
!
interface Serial1/1
 ip address 10.150.45.4 255.255.255.0
!
router eigrp 1
 network 4.4.4.4 0.0.0.0
 network 10.150.34.4 0.0.0.0
 no auto-summary
 eigrp router-id 4.4.4.4
!
router bgp 234
 no synchronization
 bgp router-id 4.4.4.4
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 234
 neighbor 2.2.2.2 shutdown
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 10.150.24.2 remote-as 234
 neighbor 10.150.24.2 update-source Tunnel0
 neighbor 10.150.24.2 next-hop-self
 neighbor 10.150.45.5 remote-as 5
 no auto-summary
!


We have the same result by establishing a session between R2 and R4 Loopback0...




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