ECS4660-28F_Management Guide-R03

C HAPTER 49 | IP Interface Commands
IPv4 Interface
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input errors
4 output
Console#
traceroute This command shows the route packets take to the specified destination.
SYNTAX
traceroute host
host - IP address or alias of the host.
DEFAULT SETTING
None
COMMAND MODE
Privileged Exec
COMMAND USAGE
◆ Use the traceroute command to determine the path taken to reach a
specified destination.
◆ A trace terminates when the destination responds, when the maximum
timeout (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 timeout has
been reached, may indicate this problem with the target device.
◆ If the target device does not respond or other errors are detected, the
switch will indicate this by one of the following messages:
■
* - No Response
■
H - Host Unreachable
■
N - Network Unreachable
■
P - Protocol Unreachable
■
O -Other