C
HAPTER
41
| IP Interface Commands
IPv4 Interface
– 921 –
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
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.
EXAMPLE
Console#traceroute 192.168.0.1
Press "ESC" to abort.
Source address: 192.168.0.9
Destination address: 192.168.0.1
Hop IP Address Packet 1 Packet 2 Packet 3
---------------------------------------------------------------------------
1 192.168.0.1 <10 ms <10 ms <10 ms
Trace completed.
Console#
ping This command sends (IPv4) ICMP echo request packets to another node on
the network.
SYNTAX
ping host [count count] [size size]
host - IP address or IP alias of the host.
count - Number of packets to send. (Range: 1-16)
size - Number of bytes in a packet. (Range: 32-512)
The actual packet size will be eight bytes larger than the size
specified because the router adds header information.
DEFAULT SETTING
count: 5
size: 32 bytes
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