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Three-Way Handshake for Intermediate System to Intermediate System (IS-IS) Point-to-Point Adjacencies (RFC3373)

IP.com Disclosure Number: IPCOM000009783D
Original Publication Date: 2002-Sep-01
Included in the Prior Art Database: 2002-Sep-19
Document File: 10 page(s) / 20K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Katz: AUTHOR [+2]

Abstract

The IS-IS routing protocol (ISO 10589) requires reliable protocols at the link layer for point-to-point links. As a result, it does not use a three-way handshake when establishing adjacencies on point-to- point media. This paper defines a backward-compatible extension to the protocol that provides for a three-way handshake. It is fully interoperable with systems that do not support the extension.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � D. Katz

Request for Comments: 3373� � � � � � � � � � � � � � � � � � � � � � � Juniper Networks, Inc.

Category: Informational� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � R. Saluja

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Tenet Technologies

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � September 2002

� � � � � � � � � � � � � � � � � � � � � � � Three-Way Handshake for

� � � � � � � � � Intermediate System to Intermediate System (IS-IS)

� � � � � � � � � � � � � � � � � � � � � Point-to-Point Adjacencies

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 (2002).� All Rights Reserved.

Abstract

� � The IS-IS routing protocol (ISO 10589) requires reliable protocols at

� � the link layer for point-to-point links.� As a result, it does not

� � use a three-way handshake when establishing adjacencies on point-to-

� � point media.� This paper defines a backward-compatible extension to

� � the protocol that provides for a three-way handshake.� It is fully

� � interoperable with systems that do not support the extension.

� � Additionally, the extension allows the robust operation of more than

� � 256 point-to-point links on a single router.

� � This extension has been implemented by multiple router vendors; this

� � paper is provided as information to the Internet community in order

� � to allow interoperable implementations to be built by other vendors.

1.� Terms

� � The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

� � "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

� � document are to be interpreted as described in BCP 14, RFC 2119.

2.� Introduction

� � The IS-IS protocol [1] assumes certain requirements stated in ISO

� � 10589 (section 6.7.2) for the operation of IS-IS over point-to-point

� � links and hence provides only a two-way handshake when establishing

Katz & Saluja� � � � � � � � � � � � � � � Informational� � � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3373� � � � � � � � � � � � Three-Way Handshake for IS-IS� � � � � � � September 2002

� � adjacencies on point-to-point links.� The protocol does not operate

� � correctly if these subnetwork requirements for point-to-point links

� � are not met.� The basic mechanism defined in the standard is that

� � each side declares the other side to be reachable if a Hello packet

� � is heard from it.� Once this occurs, each side then sends a Complete

� � Sequence Number PDU (CSNP) to trigger database synchronization.

� � Three failure modes are known.� First, if the link goes down and then

� � comes...