- Full mesh not required
- Allows for NBMA networking
- No DR/BDR elections
- Timers = 30 seconds /120 seconds
- Do not need to manually configure neighbor statements
- Specific networks advertised through out.
Configuration:
Lacking a diagram, assume we have 4 routers in a hub and spoke design. R1 is the Hub and R2,R3, and R4 are spoke routers. Frame-relay is in use.
On R1:
R1(config)#router ospf 1
R1(config-router)#network 192.168.1.0 0.0.0.255 area 0
!
R1(config)#int s0/0
R1(config-if)#ip address 192.168.1.1 255.255.255.0
R1(config-if)#encapsulation frame-relay
R1(config-if)#ip ospf network point-to-multipoint
R1(config-if)#frame-relay map ip 192.168.1.2 102^
R1(config-if)#frame-relay map ip 192.168.1.3 103
R1(config-if)#frame-relay map ip 192.168.1.4 104
!
^ maps 192.168.1.2 to DLCI 102 - this is locally significant.
On R2:
R2(config)#router ospf 1
R2(config-router)#network 192.168.1.0 0.0.0.255 area 0
!
R2(config)#int s0/0
R2(config-if)#ip address 192.168.1.2 255.255.255.0
R2(config-if)#encapsulation frame-relay
R2(config-if)#ip ospf network point-to-multipoint
R2(config-if)#frame-relay map ip 192.168.1.1 25
R2(config-if)#frame-relay map ip 192.168.1.3 25
R2(config-if)#frame-relay map ip 192.168.1.4 25
!
On R3:
R3(config)#router ospf 1
R3(config-router)#network 192.168.1.0 0.0.0.255 area 0
!
R3(config)#int s0/0
R3(config-if)#ip address 192.168.1.3 255.255.255.0
R3(config-if)#encapsulation frame-relay
R3(config-if)#ip ospf network point-to-multipoint
R3(config-if)#frame-relay map ip 192.168.1.1 35
R3(config-if)#frame-relay map ip 192.168.1.2 35
R3(config-if)#frame-relay map ip 192.168.1.4 35
!
On R4:
R4(config)#router ospf 1
R4(config-router)#network 192.168.1.0 0.0.0.255 area 0
!
R4(config)#int s0/0
R4(config-if)#ip address 192.168.1.4 255.255.255.0
R4(config-if)#encapsulation frame-relay
R4(config-if)#ip ospf network point-to-multipoint
R4(config-if)#frame-relay map ip 192.168.1.1 45
R4(config-if)#frame-relay map ip 192.168.1.2 45
R4(config-if)#frame-relay map ip 192.168.1.3 45
!
Note - the lack of manually assigned neighbor statements and the fact you still need to configure your frame-relay maps.
-Also do not forget the ip ospf network point-to-multipoint cmd.
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