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HP OpenVMS Systems Documentation
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HP OpenVMS Cluster Systems
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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         Excessive Packet Losses on LAN Paths
         F.2.4         Preliminary Network Diagnosis
         F.2.5         Tracing Intermittent Errors
         F.2.6         Checking System Parameters
         F.2.7         Channel Timeouts
     F.3     Using SDA to Monitor LAN or IP 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 for LAN devices
         F.3.5         Monitoring PEDRIVER Buses for LAN Devices
         F.3.6         Monitoring LAN Adapters
         F.3.7         Monitoring PEDRIVER Buses for IP interfaces
         F.3.8         Monitoring PEDRIVER Channels for IP Interfaces
     F.4     Using SCACP to Monitor Cluster Communications
     F.5     Troubleshooting NISCA Communications
         F.5.1         Areas of Trouble
     F.6     Channel Formation
         F.6.1         How Channels Are Formed
         F.6.2         Techniques for Troubleshooting
     F.7     Retransmission Problems
         F.7.1         Why Retransmissions Occur
         F.7.2         Techniques for Troubleshooting
     F.8     Understanding NISCA Datagrams
         F.8.1         Packet Format
         F.8.2         LAN Headers
         F.8.3         Ethernet Header
         F.8.4         Datagram Exchange (DX) Header
         F.8.5         Channel Control (CC) Header
         F.8.6         Transport (TR) Header
     F.9     Using a LAN Protocol Analysis Program
         F.9.1         Single or Multiple LAN Segments
         F.9.2         Multiple LAN Segments
     F.10     Data Isolation Techniques
         F.10.1         All OpenVMS Cluster Traffic
         F.10.2         Specific OpenVMS Cluster Traffic
         F.10.3         Virtual Circuit (Node-to-Node) Traffic
         F.10.4         Channel (LAN Adapter--to--LAN Adapter) Traffic
         F.10.5         Channel Control Traffic
         F.10.6         Transport Data
     F.11     Setting Up an HP 4972A LAN Protocol Analyzer
         F.11.1         Analyzing Channel Formation Problems
         F.11.2         Analyzing Retransmission Problems
     F.12     Filters
         F.12.1         Capturing All LAN Retransmissions for a Specific OpenVMS Cluster
         F.12.2         Capturing All LAN Packets for a Specific OpenVMS Cluster
         F.12.3         Setting Up the Distributed Enable Filter
         F.12.4         Setting Up the Distributed Trigger Filter
     F.13     Messages
         F.13.1         Distributed Enable Message
         F.13.2         Distributed Trigger Message
     F.14     Programs That Capture Retransmission Errors
         F.14.1         Starter Program
         F.14.2         Partner Program
         F.14.3         Scribe Program
Appendix G
Appendix G NISCA Transport Protocol Congestion Control
     G.1     NISCA Congestion Control
         G.1.1         Congestion Caused by Retransmission
             G.1.1.1             OpenVMS VAX Version 6.0 or OpenVMS AXP Version 1.5, or Later
         G.1.2         HELLO Multicast Datagrams
         G.1.3         HELLO IP Unicast and IP Multicast Datagrams

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