Prerequisites: CCNP level skills.
Topology
Pic. 1 - EIGRP NBMA Topology.
Icons designed by: Andrzej Szoblik - http://www.newo.pl
Task 1
Task 2
Check the reachability between the spoke routers (R2 and R3). Make sure LANs between R2 and R3 are reachable.
Lab Solution
Task 1
Enable EIGRP on all interfaces of the routers in pic. 1 (AS=1). Use the most specific wildcard mask. Disable automatic summarization. Make the local loopback0 IP address the ID of EIGRP router.
R1 Configuration:
!
router eigrp 1
network 10.1.0.1 0.0.0.0
network 10.1.1.1 0.0.0.0
network 172.16.101.1 0.0.0.0
no auto-summary
network 10.1.0.1 0.0.0.0
network 10.1.1.1 0.0.0.0
network 172.16.101.1 0.0.0.0
no auto-summary
eigrp router-id 172.16.101.1
!
R2 Configuration:
!
router eigrp 1
network 10.1.0.2 0.0.0.0
network 10.1.2.2 0.0.0.0
network 172.16.102.2 0.0.0.0
no auto-summary
network 10.1.0.2 0.0.0.0
network 10.1.2.2 0.0.0.0
network 172.16.102.2 0.0.0.0
no auto-summary
eigrp router-id 172.16.102.2
!
R3 Configuration:
!
router eigrp 1
network 10.1.0.3 0.0.0.0
network 10.1.3.3 0.0.0.0
network 172.16.103.3 0.0.0.0
no auto-summary
eigrp router-id 172.16.103.3
network 10.1.0.3 0.0.0.0
network 10.1.3.3 0.0.0.0
network 172.16.103.3 0.0.0.0
no auto-summary
eigrp router-id 172.16.103.3
!
Verification:
Pic. 2 - EIGRP Neighbors on R1.
Note!
'Q Cnt' show '0' for each neighbor. This indicates full convergence.
Pic. 3 - R2's EIGRP Routing Table.
Note!
R2 does NOT receive prefixes advertised by R3. The reason is the 'split-horizon' enabled on R1 by default. The solution to this reachability problem on NBMA hub-and-spoke topology can be disabling 'split-horizon' or using sub-interfaces point-to-point with different layer 3 subnet address on each.
Task 2
Check the reachability between the spoke routers (R2 and R3). Make sure LANs between R2 and R3 are reachable.
R1 Configuration:
!
interface Serial0/0
ip address 10.1.0.1 255.255.255.0
encapsulation frame-relay
no ip split-horizon eigrp 1
serial restart-delay 0
frame-relay map ip 10.1.0.2 102 broadcast
frame-relay map ip 10.1.0.3 103 broadcast
no frame-relay inverse-arp
ip address 10.1.0.1 255.255.255.0
encapsulation frame-relay
no ip split-horizon eigrp 1
serial restart-delay 0
frame-relay map ip 10.1.0.2 102 broadcast
frame-relay map ip 10.1.0.3 103 broadcast
no frame-relay inverse-arp
!
Verification:
Pic. 4 - R2's EIGRP Routing Table.
Pic. 5 - Ping Test Between Spokes.
