Re: neighborship in OSPF between different network types.

Naufal,

Neighborship will come up since the timers are of same values but adjacency
will never occur due to the fact that Broadcast networks require DR/BDR
while point-to-point networks dont.

HTH

On Mon, Sep 14, 2009 at 10:22 AM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:

> HI Guys ,
>
> correct me if I am wrong.
>
> I have two routers R1 and R2 directly connected.Ospf is configured on them.
>
> R1 's network type is point-to-point and R2 is of broadcast type.
>
> I was bit amazed when the neighborship came up between them.then I realised
> may be its the same hello/dead timer interval due to which they came
> up.they
> became neighbours but not adjacent as they were not exchanging routes with
> each other.Can some one help me understanding this concept or give me a
> link
> for it ?
>
> R2#sh ip ospf ne
> Neighbor ID Pri State Dead Time Address Interface
> 1.1.1.1 1 FULL/BDR 00:00:38 1.1.1.1
> FastEthernet0/
> 0
> R2#sh ip ospf net
> R2#sh ip ospf int
> Loopback1 is up, line protocol is up
> Internet Address 10.20.10.1/24, Area 0
> Process ID 1, Router ID 1.1.1.2, Network Type LOOPBACK, Cost: 1
> Loopback interface is treated as a stub Host
> FastEthernet0/0 is up, line protocol is up
> Internet Address 1.1.1.2/24, Area 0
> Process ID 1, Router ID 1.1.1.2, Network Type BROADCAST, Cost: 1
> Transmit Delay is 1 sec, State DR, Priority 1
> Designated Router (ID) 1.1.1.2, Interface address 1.1.1.2
> Backup Designated router (ID) 1.1.1.1, Interface address 1.1.1.1
> Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
> Hello due in 00:00:02
> Index 1/1, flood queue length 0
> Next 0x0(0)/0x0(0)
> Last flood scan length is 1, maximum is 2
> Last flood scan time is 0 msec, maximum is 0 msec
> Neighbor Count is 1, Adjacent neighbor count is 1
> Adjacent with neighbor 1.1.1.1 (Backup Designated Router)
> Suppress hello for 0 neighbor(s)
>
> R1#sh ip ospf ne
> Neighbor ID Pri State Dead Time Address Interface
> 1.1.1.2 1 FULL/ - 00:00:32 1.1.1.2
> FastEthernet0/
> 0
> R1#sh ip ospf int
> FastEthernet0/0 is up, line protocol is up
> Internet Address 1.1.1.1/24, Area 0
> Process ID 1, Router ID 1.1.1.1, Network Type POINT_TO_POINT, Cost: 1
> Transmit Delay is 1 sec, State POINT_TO_POINT,
> Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
> Hello due in 00:00:02
> 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 0 msec
> Neighbor Count is 1, Adjacent neighbor count is 1
> Adjacent with neighbor 1.1.1.2
> Suppress hello for 0 neighbor(s)
>
>
> Thanks,
> Naufal
>
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Received on Mon Sep 14 2009 - 10:26:47 ART