OSPF Over NBMA - 5 Modes
Tunning OSPF
NON_BROADCAST (NBMA)
Default on Framrelay multipoint
Static neighbor
DR/BDR
Static framrelay mapping
POINT_TO_MULTIPOINT
No DR/BDR
Dynamic Framrelay mapping
BROADCAST
Full Mesh required
DR/BDR
POINT_TO_POINT
Default for Framrelay Point-to-point
No DR/BDR
POINT_TO_MULTIPOINT
Same as RFC Point-to-multipoin
Static neighboR
Router 1
interface Serial0/0
no ip address
encapsulation frame-relay
clock rate 2000000
no arp frame-relay
no frame-relay inverse-arp
!
interface Serial0/0.1 multipoint
ip address 170.100.100.1 255.255.255.0
frame-relay map ip 170.100.100.2 102 broadcast
frame-relay map ip 170.100.100.3 103 broadcast
no frame-relay inverse-arp
Router 2
interface Serial0/0
ip address 170.100.100.2 255.255.255.0
encapsulation frame-relay
frame-relay map ip 170.100.100.1 201 broadcast
frame-relay map ip 170.100.100.3 201 broadcast
no frame-relay inverse-arp
no arp frame-relay
NON_BROADCAST mode does not take care of socks connectivity
Router 3
interface Serial0/0
ip address 170.100.100.3 255.255.255.0
encapsulation frame-relay
frame-relay map ip 170.100.100.1 301 broadcast
frame-relay map ip 170.100.100.2 301 broadcast
no frame-relay inverse-arp
no arp frame-relay
NON_BROADCAST mode does not take care of socks connectivity
Router 4
interface Serial0/0
ip address 170.100.200.2 255.255.255.252
encapsulation frame-relay
frame-relay map ip 170.100.200.1 401 broadcast
no frame-relay inverse-arp
no arp frame-relay
Router 2
interface FastEthernet0/0
ip address 170.100.2.1 255.255.255.0
router ospf 1
router-id 2.2.2.2
network 170.100.2.1 0.0.0.0 area 2
Router 3
interface FastEthernet0/0
ip address 170.100.3.1 255.255.255.0
router ospf 1
router-id 2.2.2.2
network 170.100.3.1 0.0.0.0 area 2
Router 4
interface FastEthernet0/0
ip address 170.100.4.1 255.255.255.0
router ospf 1
router-id 2.2.2.2
network 170.100.4.1 0.0.0.0 area 2
Router 1
router ospf 1
router-id 1.1.1.1
network 170.100.100.1 0.0.0.0 area 0
neighbor 170.100.100.3
neighbor 170.100.100.2
Statically add neighbor on the hub side
Router 2
router ospf 1
router-id 2.2.2.2
network 170.100.2.1 0.0.0.0 area 2
network 170.100.100.2 0.0.0.0 area 0
Router 3
router ospf 1
router-id 3.3.3.3
network 170.100.3.1 0.0.0.0 area 3
Router 1
interface Serial0/0.1 multipoint
ip ospf priority 255
Router 2
interface Serial0/0
ip ospf priority 0
Router 3
interface Serial0/0
ip ospf priority 0
Verification
R2#show ip ospf int
Serial0/0 is up, line protocol is up
Internet Address 170.100.100.2/24, Area 0
Process ID 1, Router ID 2.2.2.2, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 1.1.1.1, Interface address 170.100.100.1
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:25
R3#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
1.1.1.1 255 FULL/DR 00:01:51 170.100.100.1 Serial0/0
Router 1
interface Serial0/0.2 point-to-point
ip address 170.100.200.1 255.255.255.252
router ospf 1
router-id 1.1.1.1
network 170.100.200.1 0.0.0.0 area 0
Router 4
interface Serial0/0
ip ospf network point-to-point
Configure interface for Point-to-point mode
router ospf 1
router-id 4.4.4.4
network 170.100.200.2 0.0.0.0 area 0