1-5
To do… Use the command… Remarks
Enable sending of
ICMP timeout
packets
ip ttl-expires enable
Required
Disabled by default.
Enable sending of
ICMP destination
unreachable packets
ip unreachables enable
Required
Disabled by default.
Display the routes
from source to
destination
tracert [ -a source-ip | -f first-ttl | -m max-ttl |
-p port | -q packet-numbe | -w timeout ] *
host
Required
Available in any view
System Debugging
Introduction to System Debugging
The device provides various debugging functions. For the majority of protocols and features supported,
the system provides corresponding debugging information to help users diagnose errors.
The following two switches control the display of debugging information:
z Protocol debugging switch, which controls protocol-specific debugging information.
z Screen output switch, which controls whether to display the debugging information on a certain
screen.
As Figure 1-3
illustrates, suppose the device can provide debugging for the three modules 1, 2, and 3.
Only when both the protocol debugging switch and the screen output switch are turned on can
debugging information be output on a terminal.
Figure 1-3 The relationship between the protocol and screen debugging switch
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