11-12-2007 03:47 AM
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
11-13-2007 03:00 AM
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
11-13-2007 03:29 AM
Hi,
Thanks so much. I will verify it right now.
11-13-2007 01:21 PM
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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