Re: OSPF NBMA and Multipoint Beighbourship Issues

I think i figured it out... as long as the timers are same... they
neighbourship comes up... but...if the Network types arent fully compatible
with each other prefixes arent exchanged.!
Thanking You

Yours Sincerely

Divin Mathew John
divinjohn_at_gmail.com
divin_at_dide3d.com
http://www.dide3d.com
+91 9945430983
+91 9846697191
+974 5008916
PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt

On Mon, Jul 13, 2009 at 11:39 PM, <Keegan.Holley_at_sungard.com> wrote:

>
> Point to mutipoint interfaces don't elect DR's. All the DR really does is
> ensure that there is only one lsdb per subnet which is done here. Just
> because the other router thinks there is no DR doesn't change the fact the
> R1 has the full DB. I tried this in a lab once. I can't remember why the
> routes disappear though. Do some debugs if you really want to know what's
> going on. Since they are fully adjacent my guess is that they both have the
> LSDB but there is something wrong with the LSA's themselves like invalid
> next hops or sth. But that's just a guess of course. I'm sure someone will
> correct me shortly.
>
> Keegan
>
>
>
>
> From: Divin Mathew John <divinjohn_at_gmail.com> To: Cisco certification <
> ccielab_at_groupstudy.com> Date: 07/13/2009 01:33 PM Subject: OSPF NBMA and
> Multipoint Beighbourship Issues Sent by: nobody_at_groupstudy.com
> ------------------------------
>
>
>
> 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 Tue Jul 14 2009 - 00:16:27 ART