Appendix B. Run-time switching software default settings .......117
Appendix C. Cable lengths ...................119
Appendix D. Understanding and troubleshooting the Spanning Tree
Protocol ..........................121
STP operation levels ......................121
Bridge protocol data units ....................122
Creating a stable topology ....................122
STP port states .......................122
Setting user-changeable STP parameters .............124
Illustration of STP ......................125
Blocking state .........................127
Listening state ........................128
Learning state .........................129
Forwarding state ........................130
Disabled state .........................132
Troubleshooting STP ......................133
Spanning Tree Protocol Failure .................133
Full/half duplex mismatch ...................133
Unidirectional link ......................134
Packet corruption ......................135
Resource errors .......................135
Identifying a data loop .....................136
Avoiding network problems ...................136
Appendix E. Getting help and technical assistance ..........141
Before you call ........................141
Using the documentation .....................141
Getting help and information from the World Wide Web .........141
Software service and support ...................142
Hardware service and support ...................142
Appendix F. Warranty information.................143
Warranty period ........................143
Problem determination ....................143
Running diagnostics ....................143
Checking software .....................143
Warranty service and support ..................144
International Warranty Service ..................144
Purchasing additional services..................145
IBM Statement of Limited Warranty Z125-4753-06 8/2000 ........146
Part 1 - General Terms ....................146
Part 2 - Country-unique Terms..................148
Appendix G. Notices ......................155
Edition notice .........................155
Trademarks..........................156
Important notes ........................156
Electronic emission notices ....................157
Federal Communications Commission (FCC) statement ........157
Industry Canada Class A emission compliance statement ........158
Australia and New Zealand Class A statement ............158
United Kingdom telecommunications safety requirement ........158
European Union EMC Directive conformance statement ........158
Taiwanese Class A warning statement ...............158
vi IBM BladeCenter 4-Port Gb Ethernet Switch Module: Installation and User’s Guide
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