Aruba 8325 Series, Руководство по установке и началу работы

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Chapter 5 Troubleshooting 49
Chapter 5
Troubleshooting
This chapter describes how to troubleshoot your switch. This document describes troubleshooting mostly from a
hardware perspective. You can perform more in-depth troubleshooting on these devices using the software tools
available with the switches, including the full-featured console interface, the built-in web browser interface, and
IMC, the SNMP-based network management tool, or Aruba AirWave.
This chapter describes the following:
• Basic troubleshooting tips (see Basic troubleshooting tips )
• Diagnosing with the LEDs (see Diagnosing with the LEDs )
• Hardware diagnostic tests (see Hardware diagnostic tests )
• Downloading new software to the switch (see Downloading new switch software )
• Hewlett Packard Enterprise Customer Support Services (see Hewlett Packard Enterprise Customer
Support Services )
Basic troubleshooting tips
Most problems are caused by the following situations. Check for these items first when starting your
troubleshooting:
• Faulty or loose cables. Look for loose or obviously faulty connections. If the cables appear to be OK, make
sure the connections are snug. If that does not correct the problem, try a different cable.
• Non-standard cables. Non-standard and miswired cables may cause network collisions and other network
problems, and can seriously impair network performance. Use a new correctly-wired cable or compare your
cable to the cable in chapter 6,
Cabling and technology information for pinouts and correct cable wiring.
• Improper network topologies. It is important to make sure you have a valid network topology. Common
topology faults include excessive cable length and excessive repeater delays between end nodes. If you have
network problems after recent changes to the network, change back to the previous topology. If you no longer
experience the problems, the new topology is probably at fault.
In addition, you should make sure that your network topology contains
no data path loops . Between any two
end nodes, there should be only one active cabling path at any time. Data path loops can cause broadcast
storms that will severely impact your network performance.
For your switch, if you want to build redundant paths between important nodes in your network to provide some
fault tolerance, you should enable
Spanning Tree Protocol support on the switch. This ensures that only one
of the redundant paths is active at any time, thus avoiding data path loops. Spanning Tree can be enabled
through the switch console or the web browser interface. For more information on Spanning Tree, see the
Layer 2 Bridging Guide for your switch at www.hpe.com/networking/ResourceFinder .