Document revision date: 19 July 1999

Appendix D
Appendix D	Sample Programs for LAN Control
D.1	Purpose of Programs
D.2	Starting the NISCA Protocol
D.2.1	Start the Protocol
D.3	Stopping the NISCA Protocol
D.3.1	Stop the Protocol
D.3.2	Verify Successful Execution
D.4	Analyzing Network Failures
D.4.1	Failure Analysis
D.4.2	How the LAVC$FAILURE_ANALYSIS Program Works
D.5	Using the Network Failure Analysis Program
D.5.1	Create a Network Diagram
D.5.2	Edit the Source File
D.5.3	Assemble and Link the Program
D.5.4	Modify Startup Files
D.5.5	Execute the Program
D.5.6	Modify MODPARAMS.DAT
D.5.7	Test the Program
D.5.8	Display Suspect Components
Appendix E
Appendix E	Subroutines for LAN Control
E.1	Introduction
E.1.1	Purpose of the Subroutines
E.2	Starting the NISCA Protocol
E.2.1	Status
E.2.2	Error Messages
E.3	Stopping the NISCA Protocol
E.3.1	Status
E.3.2	Error Messages
E.4	Creating a Representation of a Network Component
E.4.1	Status
E.4.2	Error Messages
E.5	Creating a Network Component List
E.5.1	Status
E.5.2	Error Messages
E.6	Starting Network Component Failure Analysis
E.6.1	Status
E.6.2	Error Messages
E.7	Stopping Network Component Failure Analysis
E.7.1	Status
E.7.2	Error Messages
Appendix F
Appendix F	Troubleshooting the NISCA Protocol
F.1	How NISCA Fits into the SCA
F.1.1	SCA Protocols
F.1.2	Paths Used for Communication
F.1.3	PEDRIVER
F.2	Addressing LAN Communication Problems
F.2.1	Symptoms
F.2.2	Traffic Control
F.2.3	Preliminary Network Diagnosis
F.2.4	Tracing Intermittent Errors
F.2.5	Checking System Parameters
F.2.6	Channel Timeouts
F.3	Using SDA to Monitor LAN Communications
F.3.1	Isolating Problem Areas
F.3.2	SDA Command SHOW PORT
F.3.3	Monitoring Virtual Circuits
F.3.4	Monitoring PEDRIVER Buses
F.3.5	Monitoring LAN Adapters
F.4	Troubleshooting NISCA Communications
F.4.1	Areas of Trouble
F.5	Channel Formation
F.5.1	How Channels Are Formed
F.5.2	Techniques for Troubleshooting
F.6	Retransmission Problems
F.6.1	Why Retransmissions Occur
F.6.2	Techniques for Troubleshooting
F.7	Understanding NISCA Datagrams
F.7.1	Packet Format
F.7.2	LAN Headers
F.7.3	Ethernet Header
F.7.4	FDDI Header
F.7.5	Datagram Exchange (DX) Header
F.7.6	Channel Control (CC) Header
F.7.7	Transport (TR) Header
F.8	Using a LAN Protocol Analysis Program
F.8.1	Single or Multiple LAN Segments
F.8.2	Multiple LAN Segments
F.9	Data Isolation Techniques
F.9.1	All OpenVMS Cluster Traffic
F.9.2	Specific OpenVMS Cluster Traffic
F.9.3	Virtual Circuit (Node-to-Node) Traffic
F.9.4	Channel (LAN Adapter--to--LAN Adapter) Traffic
F.9.5	Channel Control Traffic
F.9.6	Transport Data
F.10	Setting Up an HP 4972A LAN Protocol Analyzer
F.10.1	Analyzing Channel Formation Problems
F.10.2	Analyzing Retransmission Problems
F.11	Filters
F.11.1	Capturing All LAN Retransmissions for a Specific OpenVMS Cluster
F.11.2	Capturing All LAN Packets for a Specific OpenVMS Cluster
F.11.3	Setting Up the Distributed Enable Filter
F.11.4	Setting Up the Distributed Trigger Filter
F.12	Messages
F.12.1	Distributed Enable Message
F.12.2	Distributed Trigger Message
F.13	Programs That Capture Retransmission Errors
F.13.1	Starter Program
F.13.2	Partner Program
F.13.3	Scribe Program

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