Cisco 300 Series Cli Manual page 90

Small business 300 series managed switches command line interface guide release 1.3

Table of Contents

packet. The default is 3 seconds. (Range: 1–60)

a source address for the probes. The device selects the optimal source

address by default. (Range: Valid IP address)

—The Type-Of-Service byte in the IP Header of the packet. (Range:

Default Usage

Command 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 can

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.

The traceroute command is not relevant to IPv6 link local addresses.

switchxxxxxx# traceroute ip 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)

—The number of seconds to wait for a response to a probe

—One of the interface addresses of the device to use as

0 msec 0 msec 0 msec

78-21075-01 Command Line Interface Reference Guide

System Management Commands