Re: OSPF problem..pls help.

R2(config-router)#do sh ip ospf int s0/0
Serial0/0 is up, line protocol is up
  Internet Address 1.1.24.2/24, Area 2
  Process ID 1, Router ID 2.2.2.2, Network Type POINT_TO_POINT, Cost: 64
  Transmit Delay is 1 sec, State POINT_TO_POINT
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:07
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 1, Adjacent neighbor count is 0
  Suppress hello for 0 neighbor(s)
 
R4(config-router)#do sh ip ospf int s0/1/0
Serial0/1/0 is up, line protocol is up
  Internet Address 1.1.24.4/24, Area 2
  Process ID 1, Router ID 4.4.4.4, Network Type POINT_TO_POINT, Cost: 64
  Transmit Delay is 1 sec, State POINT_TO_POINT
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:05
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 1/2, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 0, Adjacent neighbor count is 0
  Suppress hello for 0 neighbor(s)
 
Here you go...
--- On Sun, 13/9/09, Steve Lyons <charter21p5_at_gmail.com> wrote:

From: Steve Lyons <charter21p5_at_gmail.com>
Subject: Re: OSPF problem..pls help.
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
Date: Sunday, 13 September, 2009, 2:14 PM

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
To: Mohamed El Henawy

Cc: Divin Mathew John ; Naufal Jamal ; 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_neig
hbor_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
>
>
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Received on Sun Sep 13 2009 - 20:51:46 ART