OSPF area ID in IP address format ??

[JustTakeTheFirstStep]

What is the difference between "area1" and "area 0.0.0.1"??

I'm not sure how to understand the IP address format of Area.

The device is Nexus.

[Martin L · Accepted solution]

there should not be any difference between 2 ways of doing same thing.

"area 0.0.0.1" means  "area 1"

Regards, ML
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[JustTakeTheFirstStep]

If so, for example, what is area, 1.0.0.0, 1.1.0.0, 1.1.1.1?

[Giuseppe Larosa · Accepted solution]

Hello @JustTakeTheFirstStep ,

the OSPF standard allows to write the OSPF area-id in dotted decimal format like an IP address.

And like an IP address in dotted decimal format you can have formulas for conversion.

So for example

area 1.0.0.0 is not area 1   but it is a huge number  1 * 2^24  = 16,777,216.

Area ids in dotted decimal format are used by other vendors and provide a way to document the address block that is within a non zero area.

For example if address block 172.17.0.0/16 is within an area instead of naming the area 3 we could name it

area 172.17.0.0 making the area id meaning the address block inside it.

Hope to help

Giuseppe

[JustTakeTheFirstStep · Accepted solution]

im tested

solved

[balaji.bandi · Accepted solution]

adding to @Giuseppe Larosa ,  there is a good tool I come across how you can calculate the area with dotted decimal to decimal

https://www.beyondcli.com/ospf-conversion/

[aquinas.masakha]

Super!