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Help me on MPLS/OSPF very urgent

I have configured OSPF in my network into 2 areas (backbone & area 1) for supporting

MPLS. 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

3 REPLIES
New Member

Re: Help me on MPLS/OSPF very urgent

Hi,

I think LSA refresh time might have caused this timer to change in OSPF database. Routers originating the LSA send a copy again to refresh the old entry..

If the timer in routing table shows decrement , it means there was withdrawl of route at some point of time and it has been reinserted in Routing table..

regards,

Gaurav Prakash

New Member

Re: Help me on MPLS/OSPF very urgent

Hi,

Thanks so much. I will verify it right now.

New Member

Re: Help me on MPLS/OSPF very urgent

The right way to check routing change is to start

#debug ip routing

output is not very verbose but very usefull.

hope this help

Jmpdp

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