Working Group U. Chunduri
Internet-Draft W. Lu
Intended status: Standards Track A. Tian
Expires: July 22, 2013 Ericsson Inc.
N. Shen
Cisco Systems, Inc.
January 18, 2013
IS-IS Extended Sequence number TLV
draft-chunduri-isis-extended-sequence-no-tlv-04
Abstract
This document defines Extended Sequence number TLV to protect
Intermediate System to Intermediate System (IS-IS) PDUs from replay
attacks.
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Chunduri, et al. Expires July 22, 2013 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
1.2. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Replay attacks and Impact on IS-IS networks . . . . . . . . . 4
2.1. Impact of Replays . . . . . . . . . . . . . . . . . . . . 4
3. Extended Sequence Number TLV . . . . . . . . . . . . . . . . . 5
3.1. Sequence Number Wrap . . . . . . . . . . . . . . . . . . . 6
4. Mechanism and Packet Encoding . . . . . . . . . . . . . . . . 7
4.1. IIHs . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2. SNPs . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2.1. CSNPs . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2.2. PSNPs . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Backward Compatibility and Deployment . . . . . . . . . . . . 8
5.1. IIH and SNPs . . . . . . . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9
9. Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . 9
9.1. Appendix A.1 . . . . . . . . . . . . . . . . . . . . . . . 10
9.2. Appendix A.2 . . . . . . . . . . . . . . . . . . . . . . . 10
10. Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Operational/Implementation consideration . . . . . . . . . 10
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
11.1. Normative References . . . . . . . . . . . . . . . . . . . 11
11.2. Informative References . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
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1. Introduction
With the rapid development of new data center infrastructures, due to
its flexibility and scalability attributes, IS-IS has been adopted
widely in various L2 and L3 routing deployment of the data centers
for critical business operations. At the meantime the SDN-enabled
networks even though put more power to Internet applications and also
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