Executing Ip Traceroute - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 19 Checking Port Status and Connectivity
To determine when a datagram reaches its destination, traceroute sets the UDP destination port in the
datagram to a very large value which the destination host is unlikely to be using. When a host receives
a datagram with an unrecognized port number, it sends an ICMP port unreachable error to the source.
This message indicates to the traceroute facility that it has reached the destination.
Switches can participate as the source or destination of the traceroute command but will not appear as
a hop in the traceroute command output.

Executing IP Traceroute

To trace the path that packets take through the network, perform this task in privileged mode:
Task
Execute IP traceroute to trace the Layer 3 path
that packets take through the network.
This example shows how to use the traceroute command:
Console> (enable) traceroute 10.1.1.100
traceroute to 10.1.1.100 (10.1.1.100), 30 hops max, 40 byte packets
1 10.1.1.1 (10.1.1.1)
2 10.1.1.100 (10.1.1.100)
Console> (enable)
This example shows how to perform a traceroute with six queries to each hop with packets of
1400 bytes each:
Console> (enable) traceroute -q 6 10.1.1.100 1400
traceroute to 10.1.1.100 (10.1.1.100), 30 hops max, 1440 byte packets
1 10.1.1.1 (10.1.1.1)
2 10.1.1.100 (10.1.1.100)
Console> (enable)
78-13315-02
Command
traceroute [-n] [-w wait_time] [-i initial_ttl]
[-m max_ttl] [-p dest_port] [-q nqueries] [-t tos]
host [data_size]
1 ms 2 ms 1 ms
2 ms 2 ms 2 ms
2 ms 2 ms 2 ms 1 ms
2 ms 4 ms 3 ms 3 ms
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
2 ms 2 ms
3 ms 3 ms
Using IP Traceroute
19-11