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Cabletron's VLS Protocol Specification (RFC2642)

IP.com Disclosure Number: IPCOM000003230D
Original Publication Date: 1999-Aug-01
Included in the Prior Art Database: 2000-Sep-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

L. Kane: AUTHOR

Abstract

The Virtual LAN Link State Protocol (VLSP) is part of the InterSwitch Message Protocol (ISMP) which provides interswitch communication between switches running Cabletron's SecureFast VLAN (SFVLAN) product. VLSP is used to determine and maintain a fully connected mesh topology graph of the switch fabric. Each switch maintains an identical database describing the topology. Call-originating switches use the topology database to determine the path over which to route a call connection.

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Network Working Group L. Kane

Request for Comments: 2642 Cabletron Systems Incorporated

Category: Informational August 1999

Cabletron's VLS Protocol Specification

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 (1999). All Rights Reserved.

Abstract

The Virtual LAN Link State Protocol (VLSP) is part of the InterSwitch

Message Protocol (ISMP) which provides interswitch communication

between switches running Cabletron's SecureFast VLAN (SFVLAN)

product. VLSP is used to determine and maintain a fully connected

mesh topology graph of the switch fabric. Each switch maintains an

identical database describing the topology. Call-originating switches

use the topology database to determine the path over which to route a

call connection.

VLSP provides support for equal-cost multipath routing, and

recalculates routes quickly in the face of topological changes,

utilizing a minimum of routing protocol traffic.

Table of Contents

1. Introduction............................................ 3

1.1 Acknowledgments..................................... 3

1.2 Data Conventions.................................... 3

1.3 ISMP Overview....................................... 4

2. VLS Protocol Overview................................... 5

2.1 Definitions of Commonly Used Terms.................. 6

2.2 Differences Between VLSP and OSPF................... 7

2.2.1 Operation at the Physical Layer............... 8

2.2.2 All Links Treated as Point-to-Point........... 8

2.2.3 Routing Path Information...................... 9

2.2.4 Configurable Parameters....................... 9

2.2.5 Features Not supported........................ 9

2.3 Functional Summary.................................. 10

2.4 Protocol Packets.................................... 11

2.5 Protocol Data Structures............................ 12

2.6 Basic Implementation Requirements................... 12

2.7 Organization of the Remainder of This Document...... 13

3. Interface Data Structure................................ 14

3.1 Interface States.................................... 16

3.2 Events Causing Interface State Changes.............. 18

3.3 Interface State Machine............................. 21

4. Neighbor Data Structure................................. 23

4.1 Neighbor States..................................... 25

4.2 Events Causing Neighbor State Changes............... 27

4.3 Neighbor State Machine.............................. 29

5. Area Data Structure..................................... 33

5.1 Adding and Deleting Link State...