Before we already make OSPF adjacency using ‘neighbor xxx’ as default frame relay is Non Broadcast. Let’s make another solution using broadcast by adding command ‘ip ospf network broadcast’ in the interface.
R1#
int s0/0
encap frame-relay
ip addr 123.123.123.1 255.255.255.0
frame-relay map ip 123.123.123.2 102 broadcast
frame-relay map ip 123.123.123.3 103 broadcast
int lo0
ip addr 1.1.1.1 255.255.255.255
R2#
int s0/0
encap frame-relay
ip addr 123.123.123.2 255.255.255.0
frame-relay map ip 123.123.123.1 201 broadcast
frame-relay map ip 123.123.123.3 201
int lo0
ip addr 2.2.2.2 255.255.255.255
R3#
int s0/0
encap frame-relay
ip addr 123.123.123.3 255.255.255.0
frame-relay map ip 123.123.123.1 301 broadcast
frame-relay map ip 123.123.123.2 301
int lo0
ip addr 3.3.3.3 255.255.255.255
Check frame mapping. It should be active
R1#sh fram map
Serial0/0 (up): ip 123.123.123.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial0/0 (up): ip 123.123.123.3 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
R2(config)#do sh fram map
Serial0/0 (up): ip 123.123.123.1 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
Serial0/0 (up): ip 123.123.123.3 dlci 201(0xC9,0x3090), static,
CISCO, status defined, active
R3#sh fram map
Serial0/0 (up): ip 123.123.123.2 dlci 301(0x12D,0x48D0), static,
CISCO, status defined, active
Serial0/0 (up): ip 123.123.123.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
Make sure IP point to point already ok by test ping
R1#ping 123.123.123.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.123.123.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/23/52 ms
R1#ping 123.123.123.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.123.123.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/11/28 ms
R2(config)#do ping 123.123.123.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.123.123.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/19/52 ms
R2(config)#do ping 123.123.123.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.123.123.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/31/92 ms
Now, lets configure OSPF so the ip loopback can be ping
R1(config)#router ospf 1
R1(config-router)#network 1.1.1.1 0.0.0.0 area 0
R1(config-router)#network 123.123.123.1 0.0.0.0 area 0
R2(config)#router ospf 2
R2(config-router)#network 2.2.2.2 0.0.0.0 area 0
R2(config-router)#network 123.123.123.2 0.0.0.0 area 0
R3(config-if)#router ospf 3
R3(config-router)#network 3.3.3.3 0.0.0.0 area 0
R3(config-router)#network 123.123.123.3 0.0.0.0 area 0
Let’s make the OSPF to broadcast type
R1(config-router)#int s0/0
R1(config-if)#ip ospf network broadcast
R2(config-router)#int s0/0
R2(config-if)#ip ospf net broadc
R3(config-router)#int s0/0
R3(config-if)#ip ospf net broad
And make sure R1 is DR as hub!
R1(config-router)#int s0/0
R1(config-if)#ip ospf prio 255
R2(config-router)#int s0/0
R2(config-if)#ip ospf prio 0
R3(config-router)#int s0/0
R3(config-if)#ip ospf prio 0
Let’s check the routing table!
R2(config-if)#do sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
1.1.1.1 255 FULL/DR 00:00:39 123.123.123.1 Serial0/0
R2(config-if)#do sh ip rou
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/65] via 123.123.123.1, 00:01:00, Serial0/0
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/65] via 123.123.123.3, 00:01:00, Serial0/0
123.0.0.0/24 is subnetted, 1 subnets
C 123.123.123.0 is directly connected, Serial0/0
R2(config-if)#do ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/13/24 ms
R2(config-if)#do ping 3.3.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/28/92 ms
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