Please help me on the problem OSPF (very urgent)

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Nov 12th, 2007
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I have configured OSPF in my network into 2 areas (backbone & area 1).

Now i have somes problems with it.


1. I verify OSPF on the R1


R1#sh ip route x.x.y.1

Routing entry for x.x.y.1/32

Known via "ospf 1", distance 110, metric 2, type intra area

Last update from x.x.y.129 on GigabitEthernet1/48, 00:10:52 ago

Routing Descriptor Blocks:

* x.x.y.129, from x.x.y.1, 00:10:52 ago, via GigabitEthernet1/48

Route metric is 2, traffic share count is 1



And the time 00:10:52 ago is the same on the others routers (ALL ROUTERS R2,R3,R4 ..)

and for any subnets int the network OSPF (X.X.X.X/Y)



and then after a few minutes


R1#sh ip route x.x.y.1

Routing entry for x.x.y.1/32

Known via "ospf 1", distance 110, metric 2, type intra area

Last update from x.x.y.129 on GigabitEthernet1/48, 00:10:52 ago

Routing Descriptor Blocks:

* x.x.y.129, from x.x.y.1, 00:00:12 ago, via GigabitEthernet1/48

Route metric is 2, traffic share count is 1


And the time 00:00:12 ago is the same on the others routers (ALL ROUTERS R2,R3,R4 ..)

and for any subnets int the network OSPF (a.b.c.d/e)


Sometimse i found that the period is 10 minutes, 15 minutes and

it's a variable value.


Please tell me why and how to fix it.


Thanks so much


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Kevin Dorrell Mon, 11/12/2007 - 04:12
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I am a bit confiused about your architecture. Are these routes to loopback interfaces ... it certianly looks like it because they are /32. Is the x.x.y.129 the same x and y in every case? Is you central router the ABR - I presume so because you have only one outlying area? And does the 'x' and 'y' in x.x.y.1 correspond to the 'x' and 'y' in x.x.y.129? If so, what are the masks?


Are the adjacencies flapping?


Perhaps you could post a show ip ospf neighbor and show ip ospf database from the central router's point of view.


Kevin Dorrell

Luxembourg


intermediasud Mon, 11/12/2007 - 05:15
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Hi,


Thanks for your answer.


In my question, i use /32 such as an example. However, the problem is the same for any prefix, any router.


Addition, Ip interconnect between two routers adjencencies is prefix /30. Thus 'x' and 'y' in x.x.y.1 is correspond to the 'x' and 'y' in x.x.y.129.


- sh ip ospf nei

FULL/DR or FULL/BBR for router adj



Thanks for your help

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