Planet Networking & Communication WGSD-1022 User Manual page 287

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 3 seconds.
Command Mode
User EXEC mode
User Guidelines
The traceroute command works by taking advantage of the error messages generated by routers 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 router 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 router 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.
To find the trace to an out-of-band IP address, use the out-of-band IP address format: oob/ip-address.
Examples
console> traceroute umaxp1.physics.lsa.umich.edu
Type Esc to abort.
Tracing the route to umaxp1.physics.lsa.umich.edu (141.211.101.64)
1 i2-gateway.stanford.edu (192.68.191.83) 0 msec 0 msec 0 msec
2 STAN.POS.calren2.NET (171.64.1.213) 0 msec 0 msec 0 msec
3 SUNV--STAN.POS.calren2.net (198.32.249.73) 1 msec 1 msec 1 msec
4 Abilene--QSV.POS.calren2.net (198.32.249.162) 1 msec 1 msec 1 msec
5 kscyng-snvang.abilene.ucaid.edu (198.32.8.103) 33 msec 35 msec 35 msec
6 iplsng-kscyng.abilene.ucaid.edu (198.32.8.80) 47 msec 45 msec 45 msec
7 so-0-2-0x1.aa1.mich.net (192.122.183.9) 56 msec 53 msec 54 msec
8 atm1-0x24.michnet8.mich.net (198.108.23.82) 56 msec 56 msec 57 msec