3Com 10014299 Display and Debug Interface, Please use the following commands in all views, Number

Display and Debug Interface 109

■If a firewall is to be established on this interface, please configure parameters about related message filtering or address conversion.

There are lots of parameters to be configured in the interface view. So, this part will mainly introduce configurations of some parameters specific to the physical interface, and briefly introduce the logical interface definition. Configurations about the link layer protocol, network layer protocol, parameter and some special functions (such as dial, standby center, and firewall) will be introduced specifically in other parts of this manual and no further details are provided here.

Display and Debug Interface

Please use the following commands in all views.

Table 83 Display and debug interface

Operation	Command
Display current running state and statistic	display interfaces [type number
information of the interface (in all views)	]
	display interfaces brief
Clear interface statistic information (in system	reset counters interface [ type
view)	number ]
Shut down interface (in interface view)	shutdown
Restart interface (in interface view)	undo shutdown

When the physical or protocol state of the interface changes, the system will automatically output related prompt information of the interface (e.g., Serial0) as shown in following table.

Table 84 Interface state information

Interface state information	Meaning
% Interface Serial0 is down	The interface is shut down by the user.
% Interface Serial0 is reset	The interface is restarted by the user.
%01:10:34: Interface Serial0 changed state to	The physical state of the interface is
DOWN	changed to DOWN
%01:11:03: Interface Serial0 changed state to UP	The physical state of the interface is
	changed to UP
%01:12:02: Line protocol ip on interface Serial0,	The protocol state of the interface is
changed state to DOWN	changed to DOWN
%01:11:34: Line protocol ip on interface Serial0,	The protocol state of the interface is
changed state to UP	changed to UP

If a physical interface on the router is idle and not connected with cable, use the shutdown command to disable the interface in case that the interface goes abnormal due to some interference.