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System Management 315
•
source
ip-address—
One of the interface addresses of the device to use as a source address
for the probes. The device will normally pick what it feels is the best source address to
use. (Range: Valid IP Address)
•
tos
tos—
The
Type-Of-Service byte in the IP Header of the packet. (Range: 0-255)
Default Configuration
size
packet_size—
The default is 40 bytes.
ttl
max-ttl—
The default is 30.
count
packet_count
—The default count is 3.
timeout
time_out—
The default is 6 seconds.
Command Mode
User EXEC mode
User Guidelines
• The
traceroute
command works by taking advantage of the error messages generated by a
device when a datagram exceeds its time-to-live (TTL) value.
• The
traceroute
command starts by sending probe datagrams with a TTL value of one. This
causes the first device to discard the probe datagram and send back an error message. The
traceroute
command sends several probes at each TTL level and displays the round-trip time
for each.
• The
traceroute
command sends out one probe at a time. Each outgoing packet may result in
one or two error messages. A "time exceeded" error message indicates that an intermediate
device has seen and discarded the probe. A "destination unreachable" error message indicates
that the destination node has received the probe and discarded it because it could not deliver
the packet. If the timer goes off before a response comes in, the
traceroute
command prints
an asterisk (*).
• The
traceroute
command terminates when the destination responds, when the maximum
TTL is exceeded, or when the user interrupts the trace with
Esc.