Lab 90 - non-BGP Transit with GRE Tunnel - Learn Cisco

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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
!


Verification:
Pic. 2 - GRE Tunnel.

Pic. 3 - BGP Session Over Tunnel0.

Pic. 4 - Tunnel Interface OSPF-Enabled.

Pic. 5 - 0SPF Adjacency Between R3 and R4.

Pic. 6 - BGP Table on R3.

Pic. 7 - BGP Table on R4.

Pic. 8 - Ping Test.

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