OSPF: LSA3 - summarisation to what ?

Answered Question
Aug 13th, 2009

Hello

In area0 i have networks 10.0.1.0/24, 10.0.2.0/24 and 10.0.3.0/24 and 10.0.4.0/24. R1 is ABR between area0 and area1. What LSA type 3 will be send into area1 ? (what network and mask will be inside this LSA3?)

Thanx

I have this problem too.
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Correct Answer by ajaykumar2k1 about 7 years 3 months ago

Hi,

Four type 3 Lsa will be sent.One for each 10.0.1.0/24, 10.0.2.0/24 , 10.0.3.0/24 and 10.0.4.0/24 provided you are not using summarization on ABR.

Networks and mask inside the LSa will be following

1) 10.0.1.0 mask 255.255.255.0

2) 10.0.2.0 mask 255.255.255.0

3) 10.0.3.0 mask 255.255.255.0

4) 10.0.4.0 mask 255.255.255.0

Hope this answer your query

Regards

Ajay Kumar

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Correct Answer
ajaykumar2k1 Thu, 08/13/2009 - 04:35

Hi,

Four type 3 Lsa will be sent.One for each 10.0.1.0/24, 10.0.2.0/24 , 10.0.3.0/24 and 10.0.4.0/24 provided you are not using summarization on ABR.

Networks and mask inside the LSa will be following

1) 10.0.1.0 mask 255.255.255.0

2) 10.0.2.0 mask 255.255.255.0

3) 10.0.3.0 mask 255.255.255.0

4) 10.0.4.0 mask 255.255.255.0

Hope this answer your query

Regards

Ajay Kumar

Wilson Samuel Thu, 08/13/2009 - 04:41

I believe it would depend upon what you provide under the command "area area-id range address mask" command on the ABR.

However I should be able to cross check that in the lab.

Any other experts?

Regards

wilson Samuel

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