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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
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
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.
Operation Command
Display current running state and statistic
information of the interface (in all views)
display interfaces [type number
]
display interfaces brief
Clear interface statistic information (in system
view)
reset counters interface [ type
number ]
Shut down interface (in interface view) shutdown
Restart interface (in interface view) undo shutdown
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
DOWN
The physical state of the interface is
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,
changed state to DOWN
The protocol state of the interface is
changed to DOWN
%01:11:34: Line protocol ip on interface Serial0,
changed state to UP
The protocol state of the interface is
changed to UP