ospf lab 4 cont...

here we'll change the point-to-point networks to point-to-multipoint links...  remove the neighbor statements with the no form of the command on each router as well as any priority first...

hq#sh run | begin router
router ospf 1
 network 10.1.1.0 0.0.0.255 area 0
 network 10.1.123.0 0.0.0.255 area 0
 neighbor 10.1.123.3
 neighbor 10.1.123.2

hq#sh run | begin router
router ospf 1
 network 10.1.1.0 0.0.0.255 area 0
 network 10.1.123.0 0.0.0.255 area 0

east#sh run | beg router
router ospf 1
 network 10.1.2.0 0.0.0.255 area 0
 network 10.1.123.0 0.0.0.255 area 0
 neighbor 10.1.123.1

east#sh run | beg router
router ospf 1
 network 10.1.2.0 0.0.0.255 area 0
 network 10.1.123.0 0.0.0.255 area 0

you get the idea, then lose the ospf priority...

east#sh run int s1/2
Building configuration...

Current configuration : 291 bytes
!
interface Serial1/2
 ip address 10.1.123.2 255.255.255.0
 encapsulation frame-relay IETF
 ip ospf priority 0
 serial restart-delay 0
 clock rate 64000
 frame-relay map ip 10.1.123.3 201
 frame-relay map ip 10.1.123.2 201
 frame-relay map ip 10.1.123.1 201
 no frame-relay inverse-arp

east#sh run int s1/2
Building configuration...

Current configuration : 271 bytes
!
interface Serial1/2
 ip address 10.1.123.2 255.255.255.0
 encapsulation frame-relay IETF
 serial restart-delay 0
 clock rate 64000
 frame-relay map ip 10.1.123.3 201
 frame-relay map ip 10.1.123.2 201
 frame-relay map ip 10.1.123.1 201
 no frame-relay inverse-arp

now for the 3 serials add point-to-multipoint and append the broadcast statement to the frame maps...

hq#sh run int s1/0
Building configuration...

Current configuration : 320 bytes
!
interface Serial1/0
 ip address 10.1.123.1 255.255.255.0
 encapsulation frame-relay IETF
 ip ospf network point-to-multipoint
 serial restart-delay 0
 frame-relay map ip 10.1.123.3 103 broadcast
 frame-relay map ip 10.1.123.2 102 broadcast
 no frame-relay inverse-arp

note: you won't need the local interface's frame map...

east#sh run int s1/2
Building configuration...

Current configuration : 293 bytes
!
interface Serial1/2
 ip address 10.1.123.2 255.255.255.0
 encapsulation frame-relay IETF
 ip ospf network point-to-multipoint
 serial restart-delay 0
 clock rate 64000
 frame-relay map ip 10.1.123.3 201 broadcast
 frame-relay map ip 10.1.123.1 201 broadcast
 no frame-relay inverse-arp

west#sh run int s1/3
Building configuration...

Current configuration : 270 bytes
!
interface Serial1/3
 ip address 10.1.123.3 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-multipoint
 serial restart-delay 0
 frame-relay map ip 10.1.123.2 301 broadcast
 frame-relay map ip 10.1.123.1 301 broadcast
 no frame-relay inverse-arp

note the routes are host routes, expected by point-to-multipoint

east#sh ip route | excl L | incl Loop

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
O        10.1.1.0/24 [110/65] via 10.1.123.1, 00:04:17, Serial1/2
C        10.1.2.0/24 is directly connected, Loopback2
O        10.1.3.0/24 [110/129] via 10.1.123.1, 00:02:15, Serial1/2
C        10.1.23.0/24 is directly connected, FastEthernet0/0
C        10.1.123.0/24 is directly connected, Serial1/2
O        10.1.123.1/32 [110/64] via 10.1.123.1, 00:04:17, Serial1/2
O        10.1.123.3/32 [110/128] via 10.1.123.1, 00:02:15, Serial1/2

east#sh ip ospf int s1/2
Serial1/2 is up, line protocol is up
  Internet Address 10.1.123.2/24, Area 0, Attached via Network Statement
  Process ID 1, Router ID 10.1.2.1, Network Type POINT_TO_MULTIPOINT, Cost: 64
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           64        no          no            Base
  Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT
  Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5