RFC 3567 (rfc3567) - Page 1 of 6
Intermediate System to Intermediate System (IS-IS) Cryptographic Authentication
Alternative Format: Original Text Document
Network Working Group T. Li
Request for Comments: 3567 Procket Networks
Category: Informational R. Atkinson
Extreme Networks
July 2003
Intermediate System to Intermediate System (IS-IS)
Cryptographic Authentication
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes the authentication of Intermediate System to
Intermediate System (IS-IS) Protocol Data Units (PDUs) using the
Hashed Message Authentication Codes - Message Digest 5 (HMAC-MD5)
algorithm as found in RFC 2104. IS-IS is specified in International
Standards Organization (ISO) 10589, with extensions to support
Internet Protocol version 4 (IPv4) described in RFC 1195. The base
specification includes an authentication mechanism that allows for
multiple authentication algorithms. The base specification only
specifies the algorithm for cleartext passwords.
This document proposes an extension to that specification that allows
the use of the HMAC-MD5 authentication algorithm to be used in
conjunction with the existing authentication mechanisms.
1. Introduction
The IS-IS protocol, as specified in ISO 10589 [1], provides for the
authentication of Link State PDUs (LSPs) through the inclusion of
authentication information as part of the LSP. This authentication
information is encoded as a Type-Length-Value (TLV) tuple. The use
of IS-IS for IPv4 networks is described in [3].
The type of the TLV is specified as 10. The length of the TLV is
variable. The value of the TLV depends on the authentication
algorithm and related secrets being used. The first octet of the
value is used to specify the authentication type. Type 0 is
Li & Atkinson Informational