Re: OSPF NBMA and Multipoint Beighbourship Issues

Try debug ip ospf adj and events. Sorry not being lazy, just still
working. I'll probably try this on my own later.

From:
Con Spathas <ccie19226_at_googlemail.com>
To:
Divin Mathew John <divinjohn_at_gmail.com>
Cc:
Keegan.Holley_at_sungard.com, Cisco certification <ccielab_at_groupstudy.com>,
nobody_at_groupstudy.com
Date:
07/13/2009 03:54 PM
Subject:
Re: OSPF NBMA and Multipoint Beighbourship Issues
Sent by:
nobody_at_groupstudy.com

I caught this on the 'debug ip ospf spf'

Mismatched network types sees this:

*Mar 1 00:05:56.115: Processing link 1, id 2.2.2.2, link data
12.12.12.1, type 1
*Mar 1 00:05:56.115: No RTR Back link

Matches networks types (in this cast both p2p) see this:

*Mar 1 00:13:12.087: Processing link 2, id 2.2.2.2, link data
255.255.255.255, type 3
*Mar 1 00:13:12.091: Add better path to LSA ID 2.2.2.2, gateway
2.2.2.2, dist 11
*Mar 1 00:13:12.095: Add path: next-hop 12.12.12.2, interface
Ethernet0/0

I can't seem to find much about the 'No RTR Back link' debug though.

On Mon, Jul 13, 2009 at 7:46 PM, Divin Mathew John<divinjohn_at_gmail.com>
wrote:
> 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!?
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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Received on Mon Jul 13 2009 - 15:57:39 ART