3
Troubleshooting
This chapter describes how to troubleshoot your Switch 208/224. Note that if you have a Switch 208/224 Management Module, you can troubleshoot your switch using software. See the HP AdvanceStack Switch 208/224 Manage- ment Module Installation and Reference Guide for more information.
This chapter describes the following:
■solutions to common problems
■LED error indications
■diagnostic tests
■resetting the switch
■HP Customer Support Services
Solutions to Common Problems
Most problems are caused by the following situations:
■Incorrect switch-to-switch or switch-to-hub connections. If you have connected your switch to another switch or a hub by using twisted- pair cable from an RJ-45MDI-X connector on your switch to the same type of connector on the other switch or hub, you must use a crossover cable. If you have used a straight-through cable, the connection will not work. The LED for the port you are using will not come on when you connect the cable.
Use crossover twisted-pair cable for switch-to-switch or switch-to-hub connections, and straight-through cable for switch-to-end node connec- tions. See appendix A, “Cables and Connectors” for pinouts and correct cable wiring for crossover and straight-through twisted-pair cables.
■Faulty cable or cable is loose. Look for loose or obviously faulty connections. If they appear to be OK, try a different cable.
■Non-standard cables. Non-standard and miswired cables may cause numerous network collisions, and can seriously impair network perfor- mance. Use a new correctly-wired cable or compare your cable to the
