TAP Series Switch Command Line Reference
Default
None
Usage
You can use IP traceroute to identify the path that packets take through the network on a
hop-by-hop basis. The command output displays all network layer (Layer 3) devices, such as
routers, that the traffic passes through on the way to the destination.
Your switches can participate as the source or destination of the traceroute privileged EXEC
command and might or might not appear as a hop in the traceroute command output. If the
switch is the destination of the traceroute, it is displayed as the final destination in the
traceroute output. Intermediate switches do not show up in the traceroute output if they are
only bridging the packet from one port to another within the same VLAN. However, if the
intermediate switch is a multilayer switch that is routing a particular packet, this switch
shows up as a hop in the traceroute output.
The traceroute privileged EXEC command uses the Time To Live (TTL) field in the IP header to
cause routers and servers to generate specific return messages. Traceroute starts by sending
a User Datagram Protocol (UDP) datagram to the destination host with the TTL field set to 1.
If a router finds a TTL value of 1 or 0, it drops the datagram and sends back an Internet
Control Message Protocol (ICMP) time-to-live-exceeded message to the sender. Traceroute
determines the address of the first hop by examining the source address field of the ICMP
time-to-live-exceeded message.
Examples
The following example is sample dialog from the traceroute command using default values.
Switch# traceroute 10.108.1.29
traceroute to 10.108.1.29 (10.108.1.29), 30 hops max, 38 byte packets
1 10.108.1.27 (10.108.1.27) 2998.076 ms !H 3000.361 ms !H 3007.748 ms !H
Related Commands
ping
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