Lab 90 - non-BGP Transit with GRE Tunnel

Prerequisites: CCNP level skills.

Topology

Pic. 1 - Topology Diagram.

Icons designed by: Andrzej Szoblik - http://www.newo.pl

Notice!
Use Initial configuration (Task 1) from the lab 89.

Task 1
Ensure 172.16.105.0/24 (R5) can reach 172.16.102.0/24 (R2). Use GRE tunnel to accomplish the goal.

Lab Solution

Notice!
The same problem as in Lab 89. R1 is NOT running BGP and drops the packets between 172.16.102.0/24 and 172.16.105.0/24

Task 1

Ensure 172.16.105.0/24 (R5) can reach 172.16.102.0/24 (R2). Use GRE tunnel to accomplish the goal.

R3 Configuration:

!

interface Tunnel0
 ip address 10.1.34.3 255.255.255.0
 tunnel source Loopback0
 tunnel destination 172.16.104.4
!
router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 network 10.1.13.3 0.0.0.0 area 0
 network 10.1.34.3 0.0.0.0 area 0
 network 172.16.103.3 0.0.0.0 area 0
!

router bgp 134
 no synchronization
 bgp router-id 3.3.3.3
 bgp log-neighbor-changes
 network 172.16.103.0 mask 255.255.255.0
 neighbor 10.1.34.4 remote-as 134
 neighbor 10.1.34.4 next-hop-self
 neighbor 10.1.35.5 remote-as 50
 no auto-summary

!

R4 Configuration:

!

interface Tunnel0
 ip address 10.1.34.4 255.255.255.0
 tunnel source Loopback0
 tunnel destination 172.16.103.3
!

router ospf 1
 router-id 4.4.4.4
 log-adjacency-changes
 network 10.1.34.4 0.0.0.0 area 0
 network 10.1.124.4 0.0.0.0 area 0
 network 172.16.104.4 0.0.0.0 area 0
!

router bgp 134
 no synchronization
 bgp router-id 4.4.4.4
 bgp log-neighbor-changes
 network 172.16.104.0 mask 255.255.255.0
 network 172.16.144.0 mask 255.255.255.0
 neighbor 10.1.34.3 remote-as 134
 neighbor 10.1.34.3 next-hop-self
 neighbor 10.1.124.2 remote-as 20
 no auto-summary