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Configuring Ethernet Interfaces
Troubleshooting an Ethernet Interface
To understand the difference between the show running-config command
and the show running-config verbose command, compare Figure 3-7 to
Figure 3-8. For example, if you entered the IP address, a description, and the
no shut command to configure the Ethernet interface, only those settings are
listed when you enter the show running-config command.
When you enter show running-config verbose, other default settings that
you have not altered are also displayed. For example, the running-config
verbose command displays settings such as the Ethernet interface’s MTU,
speed and duplex settings, MAC address, as well as settings for OSPF routing
and Link Layer Discovery Protocol (LLDP).
Troubleshooting an Ethernet Interface
The first step in troubleshooting problems with any interface is to enter the
show interfaces command. This command allows you to determine, at a
glance, if the connection is up.
If the interface has not been activated, the following status is displayed:
eth 0/1 is administratively down
You should then move to the Ethernet interface configuration mode context
and enter the no shutdown command.
Two error messages indicate problems with the interface:
■ “eth 0/1 is DOWN” indicates that the Physical Layer is not active. This
problem may be caused by:
• loose or bad connection
• bad cabling
• no cabling
■ “line protocol is DOWN” indicates that the software processes that handle
the line protocol consider the interface down. Whether due to faulty
hardware, incompatible configurations, or problems at the other end of
the line, the ProCurve Secure Router cannot negotiate a link on the
interface.
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