D-Link DXS-3600 Series Reference Manual page 604

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
sees a TTL value of 1, discards the datagram, and returns the time-exceeded message to the source.
This process continues until the TTL is incremented to a value large enough for the datagram to reach the
destination host (or until the maximum TTL is reached).
To determine when a datagram has reached its destination, trace-route sets the UDP destination port in
the datagram to a very large value that 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 trace-route facility that it has reached the destination.
Use the TOS option to see if different types of service cause routes changes.
Example
This example shows how to trace-route the host 172.50.71.123.
Switch# traceroute 172.50.71.123
<10 ms 172.50.71.123
Trace complete.
Switch#
This example shows how to trace-route to the host 172.50.71.123, but the router does not reply.
Switch# traceroute 172.50.71.123
* Request timed out.
* Request timed out.
Switch#
This example shows how to trace-route to the host 172.50.71.123, but the router replies that the
destination is unreachable.
Switch# traceroute 172.50.71.123
<10 ms Network Unreachable
<10 ms Network Unreachable
Switch#
This example shows how to trace-route to the host with the IPv6 address
2001:238:f8a:77:7c10:41c0:6ddd:ecab.
Switch# traceroute 2001:238:f8a:77:7c10:41c0:6ddd:ecab
<10 ms 2001:238:f8a:77:7c10:41c0:6ddd:ecab
Trace complete.
Switch#
50-4 ip helper-address
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