Cryptographic Algorithm Implementation Requirements for IS-IS

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Last updated 2007-03-01
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


IS-IS currently defines two different kinds of authentication schemes: Clear Text password and HMAC-MD5. There has been recently a new draft submitted that adds support for a generic cryptographic authentication scheme, which can make use of different cryptographic algorithms in order to authenticate the IS-IS PDUs. To ensure interoperability between disparate implementations, it is imperative that we specify a set of mandatory-to-implement algorithms to ensure that there is at least one algorithm that all implementations will have available. This document defines the current set of mandatory-to-implement algorithms to be used for the cryptographic authentication for IS-IS as well as specifying the algorithms that should be implemented because they may be promoted to mandatory at some future time.


Manav Bhatia (
Vishwas Manral (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)