From: Vikram Dadlaney (vdadlaney@gmail.com)
Date: Thu Jun 15 2006 - 13:53:09 ART
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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