Basic Troubleshooting Tips - HP Series 200 Installation Manual

Troubleshooting

Basic Troubleshooting Tips

Basic Troubleshooting Tips
N o t e
Some of the router's console commands are used for the troubleshooting
instructions in this chapter. Refer to "Connect a console" (page 1-10) for
details on connecting to the console port. For information on the
Configuration Editor and the Network Command Language Interpreter
(NCL), refer to the User's Guide for your router.
Make sure that you have a valid network topology. If you have
trouble after a recent change to the network, switch back to the
previous topology. If you no longer have trouble, the new topology
is probably at fault.
Make sure that the router is plugged in and that cable connections
are secure.
If the console port does not work, refer to "Connect a console" (page
1-10), and then check "Troubleshooting a Terminal or Modem
Connection" (page 3-12).
Check LEDs. For descriptions, see "Interpreting Back-Panel LEDs"
(page 2-6). LED patterns that indicate a router or network error are
shown in tables 3-1 and 3-2 (pages 3-2 through 3-4).
N o t e
This chapter describes basic troubleshooting for hardware problems
indicated by the Power, Self-test, Fault, and Net Fail LEDs appearing on
all routers described in this manual. For the operating diagnosis
indicated by other LEDs on a router, refer to "Meanings of Port Status
LEDs" (page 2-9).
3-3