IS-IS multi-area

From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Mar 10 2005 - 14:16:57 GMT-3

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Hi guys,

I understand how to configure multiple areas by using tags like this:

!

router isis TEST-1

net 49.0001.0000.0000.0005.00

is-type level-1

!

router isis TEST-2

net 49.0002.0000.0000.0005.00

router isis TEST-3

net 49.0003.0000.0000.0005.00

But, what I can't figure out, is how to recognize a requirement for multiple
areas. How could tell that something

like the above is needed instead of something like this:

Router isis

net 49.0001.0000.0000.0001.00

net 49.0002.0000.0000.0001.00

net 49.0003.0000.0000.0001.00

BTW, why does the system ID portion of all areas have to be the same when
the area ID is different?

TIA, Tim

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