Dell PowerConnect 3548 Command Line Interface Guide - Page 418

• ip-address - One of the device's interface addresses to use as a source address for the probes. The device normally selects what it feels is the best source address to use. • tos - The Type-Of-Service byte in the IP Header of the packet. (Range: 0 - 255) Default Configuration • The default number of bytes in a packet is 40. • The default maximum TTL value is 30. • The default number of probes to be sent at each TTL level is 3. • The default timeout interval in seconds is 3. Command Mode User EXEC mode. User Guidelines • The traceroute command takes advantage of the error messages generated by the 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 by pressing Esc. 418 System Management