Thanks for your reply what abt dirrent area in one instance??? cuz main stuff is that loopback of two routers should be put in different area while there ethrnets will be in different area how we achieve that with running one instance....waiting for your reply
It looks to me as there might be a misunderstanding of the area concept or NSAP address in ISIS. ISIS has -no- concept of interfaces being in a specific area. This is an OSPF concept not used in ISIS at all.
In ISIS a router (not an interface) gets an address and a whole router will be in an area. Note: an ISIS router can have more than one ISIS NSAP address and thus can be in more than one area. But this feature was mainly introduced to allow for migration scenarios. Again, this feature does not mean an interface coul be assigned to an area in ISIS.
The requirements of interfaces being in an ISIS area you describe cannot be fulfilled with ISIS. Please calm down and do not go nuts over a problem impossible to solve :-)
This brings me to a question: who came up with the impossible requirements and why?
With 4 routers involved I would assume having a single ISIS area would be preferable unless there are hidden requirements/issues to be solved.
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