OSPF NBMA and Multipoint Beighbourship Issues

hello

I have this scenario.... R1------FR-Switch----R2

R1 to R2 102 Dlci
R2 to R1 DLCI 201

R1 config

interface Serial0/0
 ip address 12.1.1.1 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-multipoint
 serial restart-delay 0
 frame-relay map ip 12.1.1.2 102 broadcast
!
router ospf 1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 0
 network 12.1.1.1 0.0.0.0 area 0
 neighbor 12.1.1.2

R2 Config

interface Loopback0
 ip address 2.2.2.2 255.255.255.0
!
interface Serial0/0
 ip address 12.1.1.2 255.255.255.0
 encapsulation frame-relay
 ip ospf network non-broadcast
 serial restart-delay 0
 frame-relay map ip 12.1.1.1 201 broadcast
!
interface Serial0/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial0/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial0/3
 no ip address
 shutdown
 serial restart-delay 0
!
router ospf 1
 log-adjacency-changes
 network 2.2.2.2 0.0.0.0 area 0
 network 12.1.1.2 0.0.0.0 area 0
!

R1#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
12.1.1.2 0 FULL/ - 00:01:32 12.1.1.2 Serial0/0

R1#sio int se0/0
Serial0/0 is up, line protocol is up
  Internet Address 12.1.1.1/24, Area 0
  Process ID 1, Router ID 12.1.1.1, Network Type POINT_TO_MULTIPOINT, Cost:
64
  Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
  Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
    oob-resync timeout 120
    Hello due in 00:00:11
  Supports Link-local Signaling (LLS)
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 1
  Last flood scan time is 4 msec, maximum is 4 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 12.1.1.2
  Suppress hello for 0 neighbor(s)

R2#show ip ospf neighbor
12.1.1.1 1 FULL/BDR 00:01:33 12.1.1.1 Serial0/0

R2#sio int se0/0
Serial0/0 is up, line protocol is up
  Internet Address 12.1.1.2/24, Area 0
  Process ID 1, Router ID 12.1.1.2, Network Type NON_BROADCAST, Cost: 64
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated Router (ID) 12.1.1.2, Interface address 12.1.1.2
  Backup Designated router (ID) 12.1.1.1, Interface address 12.1.1.1
  Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
    oob-resync timeout 120
    Hello due in 00:00:06
  Supports Link-local Signaling (LLS)
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 1
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 12.1.1.1 (Backup Designated Router)
  Suppress hello for 0 neighbor(s)

Now the adjacency forms between R1 and R2 ...but routes aren't being
exchanged.. but adj stays up always..! According to what i have read, If a
network type wants DR/BDR election..it will only make neighbor with a
network type with DR/BDR election.. like NBMA and Broadcast are compatible.
P-2-M and P2P are compatible... when timers are adjusted of course. But my
question why is NBMA forming neighbourship with P2M!?

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Received on Mon Jul 13 2009 - 23:00:35 ART