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OSPF SolutionsOSPF over Non-Broadcast Media (unicast hellos, DR/BDR election)R5:interface Serial0/0 ip ospf 1 area 0

!

router ospf 1

neighbor 155.1.0.3

neighbor 155.1.0.1

neighbor 155.1.0.2

neighbor 155.1.0.4R1: (Similar config on other routers)

interface Serial0/0

ip ospf 1 area 0

frame-relay map ip 155.1.0.2 105



OSPF DR/BDR Election Manipulation (Higher priority becomes the DR, no preemption)R6#

interface FastEthernet0/0.146

ip ospf priority 255R4#

interface FastEthernet0/1

ip ospf priority 0

OSPF Network Point-to-PointRack1R4#show ip ospf interface Serial0/1

Serial0/1 is up, line protocol is up

Internet Address 155.1.45.4/24, Area 0 Process ID 1, Router ID 223.255.255.255, Network Type POINT_TO_POINT, Cost: 64

Enabled by interface config, including secondary ip addresses

Transmit Delay is 1 sec, State POINT_TO_POINT,

Network Point-to-Multipoint (partially meshed NBMA network designs)

R5:

interface Serial0/0

ip ospf network point-to-multipoint

frame-relay map ip 155.1.0.1 501 broadcast




R1:

interface Serial0/0

ip ospf network point-to-multipoint


NOTE: Both Point-to-Point & Point-to-Multipoint sends hellos as multicasts, no DR/BDR election.

OSPF Network Point-to-Multipoint Non-Broadcast (unicast hellos, no DR/BDR election)R1#interface Serial0/0

ip ospf network point-to-multipoint non-broadcast frame-relay map ip 155.1.0.5 105

R2#interface Serial0/0

ip ospf network point-to-multipoint non-broadcast frame-relay map ip 155.1.0.5 205

R5:interface Serial0/0

ip ospf network point-to-multipoint non-broadcast





!

router ospf 1

neighbor 155.1.0.1

neighbor 155.1.0.2

neighbor 155.1.0.3

neighbor 155.1.0.4

OSPF Network Loopback (Loopback0 interfaces are advertised into OSPF as /32 host routes)interface Loopback0

ip ospf 1 area 0

ip ospf network point-to-point