Thank you for your reply. But when I tried to change hello interval and dead time on one interface (isis hello-interval and isis hello-multiplier), I still could make neighborship and adjacency. From cisco's ISIS document they said the main criteria are matching authentication, IS-type and MTU size. I need to know if there are other factors. Thanks.
Those three criteria are all that are needed to match, although on certain (e.g. Frame Relay) NBMA types there needs to be a mapping of CLNS to have ISIS come up. Can you describe the details of your problem? Example of your configs might help as well.
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