Troubleshooting Multilinks; Standard Procedure; Physical Layer; Data Link Layer - HP 7102dl - ProCurve Secure Router Configuration Manual

Increasing Bandwidth

Troubleshooting Multilinks

N o t e
2-12
Troubleshooting Multilinks
Troubleshooting multilinks is similar to troubleshooting a link carried on a
single carrier line. You can review this process in "Standard Procedure" on
page 2-12. (For more troubleshooting tips, see the Basic Management and
Configuration Guide, Chapter 6: Configuring the Data Link Layer Protocol
for E1, T1, and Serial Interfaces.)
"Troubleshooting MLPPP" on page 2-15 and "Troubleshooting MLFR" on
page 2-16 deal with special considerations for troubleshooting multilinks.
The show and debug commands that you use to troubleshoot are enable mode
commands. You can also enter them from any context except basic by adding
do to the beginning of the command.

Standard Procedure

When troubleshooting a multilink, follow the standard procedure for trouble-
shooting any PPP, Frame Relay, or Asymmetric Digital Subscriber Line (ADSL)
connection:
1. Check the Physical Layer.
2. Check the Data Link Layer.

Physical Layer

Check the Stat LED for the module slot in which the line is installed. If the
LED is green, the Physical Layer is up. If you cannot send data over the link,
you will need to troubleshoot the Data Link Layer.
If the LED is red, try changing the cable and checking the other hardware. (If
the line is in a dual-module slot, you will need to use the show interfaces
command to determine which is port down.)
Next, check the configurations for the physical interface and make sure that
they match those used by your public carrier.

Data Link Layer

Different problems arise depending on the protocol the connection uses.