Configure as below
HQ
interface Loopback1
ip address 10.1.1.1 255.255.255.0
ip ospf network point-to-point
interface Serial0/0
ip address 10.1.123.1 255.255.255.0
encapsulation frame-relay
clock rate 2000000
frame-relay map ip 10.1.123.1 102
frame-relay map ip 10.1.123.2 102 broadcast
frame-relay map ip 10.1.123.3 103 broadcast
no frame-relay inverse-arp
router ospf 1
log-adjacency-changes
network 10.1.1.0 0.0.0.255 area 0
network 10.1.123.0 0.0.0.255 area 0
neighbor 10.1.123.2
neighbor 10.1.123.3
EB
interface Loopback2
ip address 10.1.2.1 255.255.255.0
ip ospf network point-to-point
interface FastEthernet0/0
ip address 10.1.23.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.123.2 255.255.255.0
encapsulation frame-relay
ip ospf priority 0
clock rate 2000000
frame-relay map ip 10.1.123.1 201 broadcast
frame-relay map ip 10.1.123.2 201
frame-relay map ip 10.1.123.3 201 broadcast
no frame-relay inverse-arp
router ospf 1
log-adjacency-changes
network 10.1.2.0 0.0.0.255 area 0
network 10.1.123.0 0.0.0.255 area 0
WB
interface Loopback3
ip address 10.1.3.1 255.255.255.0
ip ospf network point-to-point
!
interface FastEthernet0/0
ip address 10.1.23.3 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.123.3 255.255.255.0
encapsulation frame-relay
ip ospf priority 0
clock rate 2000000
frame-relay map ip 10.1.123.1 301 broadcast
frame-relay map ip 10.1.123.2 301 broadcast
frame-relay map ip 10.1.123.3 301
no frame-relay inverse-arp
router ospf 1
log-adjacency-changes
network 10.1.3.0 0.0.0.255 area 0
network 10.1.123.0 0.0.0.255 area 0
let's discuss the configuration highlighted in yellow
neighbor 10.1.123.2
neighbor 10.1.123.3
- frame-relay is non-broadcast network, so they can't automatically form neighbor. so we need to manually add neighbor on HQ
ip ospf priority 0
- in this kind of topology(hub-and-spoke), make sure HQ got to be the DR router for availability purpose, set priority on both branch to be 0
Point-To-Multipoint
but there's another option to configure OSPF in frame-relay, by using Point-To-Multipoint. This configuration didn't elect DR/BDR, so we need to remove neighbor and interface priority from previous setting.
HQ(config-router)#no neighbor 10.1.123.2
HQ(config-router)#no neighbor 10.1.123.3
EB(config-if)#no ip ospf priority 0
WB(config-if)#no ip ospf priority 0
after that issue this command on all 3 serial interface that facing frame-relay
HQ(config)#int ser 0/0
HQ(config-if)#ip ospf network point-to-multipoint
neighbor should build-up now
HQ#sh ip ospf ne
Neighbor ID Pri State Dead Time Address Interface
10.1.3.1 0 FULL/ - 00:01:53 10.1.123.3 Serial0/0
10.1.2.1 0 FULL/ - 00:01:50 10.1.123.2 Serial0/0
Changing OSPF timer
now add the ethernet link on both EB and WB into area 0
EB(config-router)#net 10.1.32.2 0.0.0.255 area 0
WB(config-router)#net 10.1.23.3 0.0.0.255 area 0
from show ip ospf interface can see the default value for hello and dead time interval
WB#sh ip os int fa 0/0
FastEthernet0/0 is up, line protocol is up
..
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
..
now change to hello = 5, dead 15, this need to be done on both interface
EB(config)#int fa 0/0
EB(config-if)#ip ospf hello-interval 5
EB(config-if)#ip ospf dead-interval 15
now show ip ospf interface again, the result should change
..
Flush timer for old DR LSA due in 00:02:15
Timer intervals configured, Hello 5, Dead 15, Wait 15, Retransmit 5
oob-resync timeout 40
..
download full conf here
Conf HQ
Conf WB
Conf EB
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