Last Call Review of draft-ietf-isis-mi-bis-02
review-ietf-isis-mi-bis-02-secdir-lc-salowey-2017-04-10-00

I have reviewed this document as part of the security directorate's ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written primarily for the benefit of the security area directors.
 Document editors and WG chairs should treat these comments just like any other
last call comments.

The document does not explicitly discuss the use-cases for multi instance
IS-IS.  Is this intended to be used a security mechanism for isolation?  The
document should provide some guidance here.

If the mechanism is intended as an isolation mechanism for security then I
think more guidance is appropriate.   For example, in this case shouldn't each
instance have its own authentication configuration?

If it is not intended as a security mechanism then the document probably say so.