Actually, the 22nd bit is the highest common bit.
10.2.00000001.0
10.2.00000010.0
10.2.00000011.0
The longest summary for this would be 10.2.0.0 /22
Summarizing the range 10.2.0.0 thru 10.2.3.255
Stephen Alston wrote:
> I want to summarize three addresses within an OSPF area:
>
> 10.2.1.0/24
> 10.2.2.0/24
> 10.2.3.0/24
>
> Converting to binary, I see the 15th bit is the highest order bit the three
> addresses have in common. From that I see the summary address is 10.2.0.0.
> What I don't understand is why the subnet mask is 16bits. To me it looks
> like it should be 15.
>
> Thanks,
> Steve
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