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| IP Interface Commands
C
45
HAPTER
IPv4 Interface
traceroute
timestamp reply messages
source quench messages
address mask request messages
address mask reply messages
UDP Statistics:
2 input
no port errors
other errors
output
TCP Statistics:
4698 input
input errors
5867 output
Console#
This command shows the route packets take to the specified destination.
S
YNTAX
traceroute host
host - IP address or alias of the host.
D
S
EFAULT
ETTING
None
C
M
OMMAND
ODE
Privileged Exec
C
U
OMMAND
SAGE
◆
Use the traceroute command to determine the path taken to reach a
specified destination.
A trace terminates when the destination responds, when the maximum
◆
time out (TTL) is exceeded, or the maximum number of hops is
exceeded.
The traceroute command first sends probe datagrams with the TTL
◆
value set at one. This causes the first router to discard the datagram
and return an error message. The trace function then sends several
probe messages at each subsequent TTL level and displays the round-
trip time for each message. Not all devices respond correctly to probes
by returning an "ICMP port unreachable" message. If the timer goes off
before a response is returned, the trace function prints a series of
asterisks and the "Request Timed Out" message. A long sequence of
these messages, terminating only when the maximum time out has
been reached, may indicate this problem with the target device.
E
XAMPLE
Console#traceroute 192.168.0.1
Press "ESC" to abort.
Traceroute to 192.168.0.99, 30 hops max, timeout is 3 seconds
– 1166 –
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Troubleshooting
