From: Vikram Dadlaney (vdadlaney@gmail.com)
Date: Thu Jun 15 2006 - 14:11:30 ART
Ok i just took a break and realized something. It seems that the LSage for
that LSA being received from 150.1.3.3 is going to reach maxage (1800
seconds I believe). Hence it is going to be flushed out. Can you confirm
that? Also your ip route shows that you learnt that route about 22 minutes
ago. Did you bring up your link to area 0 on 150.1.2.2 at that time maybe.
On 6/15/06, Vikram Dadlaney <vdadlaney@gmail.com> wrote:
>
> Hi Pierre-Alex,
>
> Please correct me if I am wrong but is Area 34 dual homed to Area 0 (for
> eg does 150.1.3.3 have another connection to area 0). I am just trying to
> understand how you have a summary LSA from 150.1.3.3 for that particular
> network. Could you post a diagram and a show ip ospf data summary from
> 150.1.3.3 as well.
>
> Regardless atleast from my understanding in order for loop prevention the
> area 0 summary LSA should be preferred. In this case the metric for the
> route received from 150.1.3.3 is also higher than the one received from
> 150.1.2.2.
>
> I don't think you should see that summary from 150.1.3.3 but maybe I am
> missing something over here. Can someone else please confirm this or correct
> me if I am wrong. Thx
>
> On 6/15/06, Pierre-Alex <paguanel@hotmail.com> wrote:
> >
> > When having to choose between a summary LSA from Area0
> > and a summary LSA from non-area 0 , OSPF will always choose
> > the link-state from area zero (regardless of the cost of the route).
> >
> > Is there any way to change this behavior and prefer the non-zero area ?
> >
> > Thanks
> >
> > Pierre-Alex
> >
> >
> > r4#sh ip route 10.1.2.0
> > Routing entry for 10.1.2.0/24
> > Known via "ospf 100", distance 110, metric 65001, type inter area
> > Last update from 10.2.4.2 on Serial0/0.402, 00:22:18 ago
> > Routing Descriptor Blocks:
> > * 10.2.4.2, from 150.1.2.2, 00:22:18 ago, via Serial0/0.402
> > Route metric is 65001, traffic share count is 1
> >
> >
> >
> > Summary Net Link States (Area 0)
> >
> > Routing Bit Set on this LSA ----> LSA CHOSEN
> > LS age: 858
> > Options: (No TOS-capability, DC, Upward)
> > LS Type: Summary Links(Network)
> > Link State ID: 10.1.2.0 (summary Network Number)
> > Advertising Router: 150.1.2.2
> > LS Seq Number: 8000000C
> > Checksum: 0x6B1D
> > Length: 28
> > Network Mask: /24
> > TOS: 0 Metric: 1
> >
> >
> >
> > Summary Net Link States (Area 34)
> >
> > LS age: 1533
> > Options: (No TOS-capability, DC, Upward)
> > LS Type: Summary Links(Network)
> > Link State ID: 10.1.2.0 (summary Network Number)
> > Advertising Router: 150.1.3.3
> > LS Seq Number: 80000001
> > Checksum: 0x126F
> > Length: 28
> > Network Mask: /24
> > TOS: 0 Metric: 782
> >
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This archive was generated by hypermail 2.1.4 : Sat Jul 01 2006 - 07:57:32 ART