49-19
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 49 Troubleshooting
Using TDR
This example shows how to perform a
traceroute
to an IP host:
Switch#
traceroute ip 171.9.15.10
Type escape sequence to abort.
Tracing the route to 171.69.115.10
1 172.2.52.1 0 msec 0 msec 4 msec
2 172.2.1.203 12 msec 8 msec 0 msec
3 171.9.16.6 4 msec 0 msec 0 msec
4 171.9.4.5 0 msec 4 msec 0 msec
5 171.9.121.34 0 msec 4 msec 4 msec
6 171.9.15.9 120 msec 132 msec 128 msec
7 171.9.15.10 132 msec 128 msec 128 msec
Switch#
The display shows the hop count, the IP address of the router, and the round-trip time in milliseconds
for each of the three probes that are sent.
To end a trace in progress, enter the escape sequence (
Ctrl-^ X
by default). Simultaneously press and
release the
Ctrl
,
Shift
, and
6
keys and then press the
X
key.
Using TDR
•
•
Running TDR and Displaying the Results, page 49-20
Understanding TDR
You can use the Time Domain Reflector (TDR) feature to diagnose and resolve cabling problems. When
running TDR, a local device sends a signal through a cable and compares the reflected signal to the initial
signal.
TDR is supported only on 10/100/1000 copper Ethernet ports. It is not supported on 10-Gigabit Ethernet
ports and on SFP module ports.
Table 49-2
Traceroute Output Display Characters
Character
Description
*
The probe timed out.
?
Unknown packet type.
A
Administratively unreachable. Usually, this output means that an access list is
blocking traffic.
H
Host unreachable.
N
Network unreachable.
P
Protocol unreachable.
Q
Source quench.
U
Port unreachable.
Summary of Contents for Catalyst 3750-E Series
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Page 52: ...lii Catalyst 3750 E and 3560 E Switch Software Configuration Guide OL 9775 08 Preface ...
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