OSPF Issue

[zeeshanraza]

Hi,

I have 2 x ASR1001 routers in our network and connected the 1 x port of each ASR to Router and the protocol between them is OSPF.

The OSPF neighborship is established and up but the issue is that we are receiving the below errors on the remote end but we are not receiving any errors on ASR end.

"Message1 :

116965 2014/07/02 08:50:19.40 IRAQ WARNING: OSPF #2043 Base VR:  1 OSPFv2 (30)

"LCL_RTR_ID 212.126.106.42: Conflicting configuration netMaskMismatch on interface To_Zain from 212.126.106.37 in hello"

  Message2:

116964 2014/07/02 08:48:55.63 IRAQ WARNING: OSPF #2043 Base VR:  1 OSPFv2 (20)

"LCL_RTR_ID 212.126.106.38: Conflicting configuration netMaskMismatch on interface TO_Zain_2 from 212.126.106.41 in hello"

Please advise what can be the reason and how we can resolve this issue.

Thanks

Zeeshan Raza

[Richard Burts]

Zeeshan Raza

It would help us figure out the problem if you would post the interface configuration of both router interfaces involved in this connection.

HTH

Rick

[faisalkhanpk]

Hi Rick,

Please find the configuration below:

interface GigabitEthernet0/0/3

 description CONENCTED-TO-ISP1-CPE
 ip address 212.126.106.37 255.255.255.252
 ip ospf network point-to-point
 negotiation auto
end

interface GigabitEthernet0/0/3

 description CONENCTED-TO-ISP2-CPE
 ip address 212.126.106.41 255.255.255.252
 ip ospf network point-to-point
 negotiation auto
end

=====================================

OSPF Configuration

router ospf 1
 router-id 212.126.106.44
 network 212.126.106.37 0.0.0.0 area 0

router ospf 1
 router-id 212.126.106.45
 network 212.126.106.41 0.0.0.0 area 0
 

I did not see any abnormality in log, The only suspicious log is as follow:

            OSPF Router with ID (212.126.106.44) (Process ID 1)

1    Jul  8 01:54:44.775: Bad pkt rcvd:  212.126.106.42  1
2    Jul  8 01:54:41.004: Bad pkt rcvd:  212.126.106.41  1
3    Jul  8 01:54:35.774: Bad pkt rcvd:  212.126.106.42  1
4    Jul  8 01:54:31.516: Bad pkt rcvd:  212.126.106.41  1
5    Jul  8 01:54:25.774: Bad pkt rcvd:  212.126.106.42  1
6    Jul  8 01:54:21.964: Bad pkt rcvd:  212.126.106.41  1
7    Jul  8 01:54:16.774: Bad pkt rcvd:  212.126.106.42  1
8    Jul  8 01:54:12.508: Bad pkt rcvd:  212.126.106.41  1
9    Jul  8 01:54:06.774: Bad pkt rcvd:  212.126.106.42  1
10   Jul  8 01:54:03.069: Bad pkt rcvd:  212.126.106.41  1

            OSPF Router with ID (212.126.106.45) (Process ID 1)

1    Jul  8 01:55:03.109: Bad pkt rcvd:  212.126.106.37  1
2    Jul  8 01:55:00.779: Bad pkt rcvd:  212.126.106.38  1
3    Jul  8 01:54:53.945: Bad pkt rcvd:  212.126.106.37  1
4    Jul  8 01:54:50.779: Bad pkt rcvd:  212.126.106.38  1
5    Jul  8 01:54:44.229: Bad pkt rcvd:  212.126.106.37  1
6    Jul  8 01:54:40.779: Bad pkt rcvd:  212.126.106.38  1
7    Jul  8 01:54:34.542: Bad pkt rcvd:  212.126.106.37  1
8    Jul  8 01:54:30.779: Bad pkt rcvd:  212.126.106.38  1
9    Jul  8 01:54:25.324: Bad pkt rcvd:  212.126.106.37  1
10   Jul  8 01:54:20.778: Bad pkt rcvd:  212.126.106.38  1

Please advice the reasons and suggestions to solve this issue.

Regards,

Faisal.

[Richard Burts]

Faisal

It appears that you have provided interface configuration of the router interfaces from one side of the connection. We also need to see the interface configuration of the other side of the connection.

HTH

Rick

[faisalkhanpk]

Dears,

Please find the configuration of other side below. Actually there is an Alcatel router on other side. It is not possible to have different subnet masks because the neighbor ship is up and p2p IP addresses are pinging.

1. IGW1:

OSPF configuration
----------------------------------------------
            router-id 212.126.106.38
            asbr
            export "OSPF-IGW1"
            area 0.0.0.0
                interface "TO_2"
                    interface-type point-to-point
                exit
            exit
            no shutdown

----------------------------------------------
interface IP address

IP address 212.126.106.38/30

--------------------------------------------

show router ospf 20 neighbor
 
===============================================================================
OSPF Neighbors
===============================================================================
Interface-Name                   Rtr Id          State      Pri  RetxQ   TTL
   Area-Id
-------------------------------------------------------------------------------
TO_2                        212.126.106.44  Full       1    0       30
   0.0.0.0
-------------------------------------------------------------------------------
No. of Neighbors: 1
===============================================================================

2. IGW2

OSPF configuration

----------------------------------------------
            router-id 212.126.106.42
            asbr
            export "OSPF-IGW2"
            area 0.0.0.0
                interface "To_"
                    interface-type point-to-point
                exit
            exit
            no shutdown
----------------------------------------------
interface IP address

IP address 212.126.106.42/30

-------------------------------------------------

show router ospf 30 neighbor
 
===============================================================================
OSPF Neighbors
===============================================================================
Interface-Name                   Rtr Id          State      Pri  RetxQ   TTL
   Area-Id
-------------------------------------------------------------------------------
To_                              212.126.106.45  Full       1    0       31
   0.0.0.0
-------------------------------------------------------------------------------
No. of Neighbors: 1
===============================================================================

[Richard Burts]

Faisal

Thank you for the additional information. I am puzzled at this information since it does not seem to match up with information in your original post. In that post you included this "Conflicting configuration netMaskMismatch on interface To_Zain" but this most recent post does not have any interfaces identified such as that. Have configurations changed? Is it possible that we are not looking at the correct machines?

HTH

Rick

[faisalkhanpk]

Hi Rick,

You are right, I removed some of the descriptions but subnets are exactly same. As i mentioned before the OSPF peering is up and I did not see any mismatch in subnet masks but the alarms are still appearing on Alcatel routers.

I have uploaded the original configuration for support.

Regards,

Faisal.

[e.ciollaro]

Hi,

may be I misunderstood the scenario; it seems you have two router directly connect on their Ge interface; first one configured with ip address 212.126.106.37 255.255.255.252 and the other  212.126.106.41 255.255.255.252 but these IP are on different subnets.  Colud you clarify me the scenario ?

Enrico

[paul driver]

Helo

Are your router-ids valid addresses any where in your network?

Try removing the static opsf rd's and letting ospf create them automatically by either a loopback  or highest active ip address on the routers and clearing the ospf process?

res

Paul