Re: OSPF problem..pls help.

Send me the output of "show ip ospf int x" for the Layer3 interface on each
side.

Steve Lyons

On Sun, Sep 13, 2009 at 9:08 AM, Mohamed El Henawy <m.henawy_at_link.net>wrote:

> They are already
>
> network 1.1.24.4 0.0.0.0 area 2
> network 1.1.24.2 0.0.0.0 area 2
>
>
>
> ----- Original Message -----
> *From:* Steve Lyons <charter21p5_at_gmail.com>
> *To:* Mohamed El Henawy <m.henawy_at_link.net>
> *Cc:* Divin Mathew John <divinjohn_at_gmail.com> ; Naufal Jamal<naufalccie_at_yahoo.in>;
> ccielab_at_groupstudy.com
> *Sent:* Sunday, September 13, 2009 5:02 PM
> *Subject:* Re: OSPF problem..pls help.
>
> Bottom line: Both OSPF neighbors are required to be in the same area.
>
> Steve Lyons
>
> On Sun, Sep 13, 2009 at 8:20 AM, Mohamed El Henawy <m.henawy_at_link.net>wrote:
>
>> I think Serial0/0/0 is already on another area and due to dynamic FR
>> Mapping
>> its getting this packet from 1.1.24.2 which is in Area 2 on this interface
>> while it should get it on Serial0/1/0
>>
>>
>>
>> ----- Original Message ----- From: "Steve Lyons" <charter21p5_at_gmail.com>
>> To: "Divin Mathew John" <divinjohn_at_gmail.com>
>> Cc: "Naufal Jamal" <naufalccie_at_yahoo.in>; <ccielab_at_groupstudy.com>
>> Sent: Sunday, September 13, 2009 4:11 PM
>> Subject: Re: OSPF problem..pls help.
>>
>>
>> Good catch. I didn't even notice. :) Check your configuration on both
>>> sides. It appears you have a mismatch of area type.
>>>
>>> router ospf 1
>>> log-adjacency-changes
>>> network 1.1.4.4 0.0.0.0 area 0 <====== does this match on the other
>>> side.
>>>
>>>
>>> Keep in mind the ospf hello packet has an area-id field and if this does
>>> not
>>> match on both sides then the adjacency will not be formed.
>>>
>>> Below is an example of packet structure I found searching google:
>>>
>>> http://routemyworld.com/wp-content/uploads/2008/07/ospf-packet-header.jpg
>>>
>>> Also here is some reading on why neighbors might not form:
>>>
>>>
>>> http://supportwiki.cisco.com/ViewWiki/index.php/OSPF_routers_do_not_form_neighbor_relationship_due_to_a_mismatch_in_hello_parameters
>>>
>>> Steve Lyons
>>>
>>>
>>>
>>>
>>> On Sun, Sep 13, 2009 at 8:56 AM, Divin Mathew John <divinjohn_at_gmail.com
>>> >wrote:
>>>
>>> *Sep 13 11:20:38.243: OSPF: Rcv pkt from 1.1.24.2, Serial0/0/0, area
>>>> 0.0.0.0
>>>> mismatch area 0.0.0.2 in the header??
>>>>
>>>>
>>>> On Sun, Sep 13, 2009 at 6:19 PM, Steve Lyons <charter21p5_at_gmail.com
>>>> >wrote:
>>>>
>>>> Ping 224.0.0.5 and source it from the ptp interface. Let me know if you
>>>>> get
>>>>> a response.
>>>>>
>>>>> Steve Lyons
>>>>>
>>>>> On Sun, Sep 13, 2009 at 6:16 AM, Naufal Jamal <naufalccie_at_yahoo.in>
>>>>> wrote:
>>>>>
>>>>> > Hi,
>>>>> >
>>>>> > I have a full-mesh of ospf network but having problems between R4 and
>>>>> > R2
>>>>> > point-to-point network type .here is the config/debug on both the
>>>>> > routers.the
>>>>> > neighbourship never comes up.
>>>>> >
>>>>> >
>>>>> > R4
>>>>> >
>>>>> > interface Serial0/1/0
>>>>> > ip address 1.1.24.4 255.255.255.0
>>>>> > encapsulation frame-relay
>>>>> > ip ospf network point-to-point
>>>>> > frame-relay map ip 1.1.24.4 402
>>>>> > frame-relay map ip 1.1.24.2 402 broadcast
>>>>> > no frame-relay inverse-arp
>>>>> > end
>>>>> >
>>>>> > R4
>>>>> >
>>>>> > (config-if)#do debug ip ospf ev
>>>>> > OSPF events debugging is on
>>>>> > R4(config-if)#
>>>>> > *Sep 13 11:20:38.131: OSPF: Send hello to 224.0.0.5 area 2 on
>>>>> Serial0/1/0
>>>>> > from
>>>>> > 1
>>>>> > .1.24.4
>>>>> > *Sep 13 11:20:38.243: OSPF: Rcv pkt from 1.1.24.2, Serial0/0/0, area
>>>>> > 0.0.0.0
>>>>> > mismatch area 0.0.0.2 in the header
>>>>> >
>>>>> > sh ip ospf ne
>>>>> > Neighbor ID Pri State Dead Time Address
>>>>> Interface
>>>>> > 1.1.3.3 1 FULL/DROTHER 00:01:51 1.1.100.3
>>>>> > Serial0/0/0
>>>>> > 1.1.6.6 1 FULL/BDR 00:01:47 1.1.100.6
>>>>> > Serial0/0/0
>>>>> >
>>>>> > router ospf 1
>>>>> > log-adjacency-changes
>>>>> > network 1.1.4.4 0.0.0.0 area 0
>>>>> > network 1.1.24.4 0.0.0.0 area 2
>>>>> > network 1.1.100.4 0.0.0.0 area 0
>>>>> > neighbor 1.1.100.3
>>>>> > neighbor 1.1.100.6
>>>>> >
>>>>> > R2
>>>>> >
>>>>> >
>>>>> > R2(config-if)#
>>>>> > *Mar 1 16:50:33.663: OSPF: Send hello to 224.0.0.5 area 2 on
>>>>> > FastEthernet0/0
>>>>> > fr
>>>>> > om 1.1.26.2
>>>>> > *Mar 1 16:50:34.491: OSPF: Rcv hello from 1.1.4.4 area 2 from >
>>>>> Serial0/0
>>>>> > 1.1.24.
>>>>> > 4
>>>>> > *Mar 1 16:50:34.491: OSPF: Send immediate hello to nbr 1.1.4.4, src
>>>>> > address
>>>>> > 1.1
>>>>> > .24.4, on Serial0/0
>>>>> > *Mar 1 16:50:34.495: OSPF: Send hello to 224.0.0.5 area 2 on >
>>>>> Serial0/0
>>>>> > from
>>>>> > 1.1
>>>>> > .24.2
>>>>> > *Mar 1 16:50:34.495: OSPF: End o
>>>>> > *Mar 1 16:58:55.403: OSPF: Rcv hello from 1.1.6.6 area 2 from
>>>>> > FastEthernet0/0
>>>>> > 1
>>>>> > .1.26.6
>>>>> > *Mar 1 16:58:55.403: OSPF: End of hello processing
>>>>> > R2(config-if)#
>>>>> > R2(config-if)#do
>>>>> > *Mar 1 16:58:58.567: OSPF: Send hello to 224.0.0.5 area 2 on >
>>>>> Serial0/0
>>>>> > from
>>>>> > 1.1
>>>>> > .24.2
>>>>> > R2(config-if)#do u all
>>>>> > All possible debugging has been turned off
>>>>> > R2(config-if)#do sh ip ospf ne
>>>>> > Neighbor ID Pri State Dead Time Address
>>>>> Interface
>>>>> > 1.1.4.4 0 INIT/ - 00:00:32 1.1.24.4
>>>>> Serial0/0
>>>>> > 1.1.6.6 1 FULL/BDR 00:00:33 1.1.26.6
>>>>> > FastEthernet0/0
>>>>> >
>>>>> > interface Serial0/0
>>>>> > ip address 1.1.24.2 255.255.255.0
>>>>> > encapsulation frame-relay
>>>>> > ip ospf network point-to-point
>>>>> > frame-relay map ip 1.1.24.2 204
>>>>> > frame-relay map ip 1.1.24.4 204 broadcast
>>>>> > no frame-relay inverse-arp
>>>>> > frame-relay lmi-type cisco
>>>>> > end
>>>>> >
>>>>> > router ospf 1
>>>>> > log-adjacency-changes
>>>>> > network 1.1.2.2 0.0.0.0 area 2
>>>>> > network 1.1.24.2 0.0.0.0 area 2
>>>>> > network 1.1.26.2 0.0.0.0 area 2
>>>>> >
>>>>> > neighborship with R3 and R6 is o.k dont understand why it is not
>>>>> comin
>>>>> up
>>>>> > between R2 and R4 p2p link...
>>>>> >
>>>>> > Thanks,
>>>>> > Naufal
>>>>> >
>>>>> >
>>>>> > See the Web&#39;s breaking stories, chosen by people like you.
>>>>> > Check out Yahoo! Buzz. http://in.buzz.yahoo.com/
>>>>> >
>>>>> >
>>>>> > Blogs and organic groups at http://www.ccie.net
>>>>> >
>>>>> >
>>>>> _______________________________________________________________________
>>>>> > Subscription information may be found at:
>>>>> > http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
>>>>> _______________________________________________________________________
>>>>> Subscription information may be found at:
>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> --
>>>>
>>>>
>>>> Oscar Wilde <http://www.quotationspage.com/quote/923.html> - "It is
>>>> better to have a permanent income than to be fascinating."
>>>>
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>> --------------------------------------------------------------------------------
>>
>>
>>
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com
>> Version: 8.5.409 / Virus Database: 270.13.94/2367 - Release Date: 09/13/09
>> 05:50:00
>>
>>
> ------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.94/2367 - Release Date: 09/13/09
> 05:50:00

Blogs and organic groups at http://www.ccie.net
Received on Sun Sep 13 2009 - 10:14:19 ART