Re: neighborship in OSPF between different network types.

Agreement on DR/BDR information (or necessity) is NOT required per the
RFC. That's an oversight in my mind, because it sure as hell matters
for your database! :) And even though you may be in full, and even
though your DBDs have been exchanged (show ip ospf database), you'll see
nothing or limited information "approved" in "show ip route".

*Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,

JNCIE-M #153, JNCIS-ER, CISSP, et al.

JNCI-M, JNCI-ER

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Mohamed El Henawy wrote:
> Thanks Ali ...I thought that they should not reach Full status
>
>
> ----- Original Message -----
> From: Ali El Moussaoui
> To: Mohamed El Henawy
> Cc: Naufal Jamal ; ccielab_at_groupstudy.com
> Sent: Monday, September 14, 2009 1:42 PM
> Subject: Re: neighborship in OSPF between different network types.
>
>
> Mohamed,
>
> The status is full but they will never exchange routes. Check that R2
> consider R1 as BDR (broadcast network) while R1 didnt go DR/BDR election
> process (p2p network). This is due to the incompatibility of network types.
>
> As mentioned above once u get 2 compatible networks u can tweak the timers
> if needed.
>
> Ali
>
>
> On Mon, Sep 14, 2009 at 12:35 PM, Mohamed El Henawy <m.henawy_at_link.net>
> wrote:
>
> I can see status is Full...so whats wrong then
>
>
> ----- Original Message ----- From: "Naufal Jamal" <naufalccie_at_yahoo.in>
> To: <ccielab_at_groupstudy.com>
> Sent: Monday, September 14, 2009 10:22 AM
> Subject: neighborship in OSPF between different network types.
>
>
>
>
> 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 - 09:51:50 ART