TDR is an online test that displays the connected wire pairs of the port and the distances to their breaks (if present) upon the completion of the test.
TDR test is supported on most Cisco Catalyst series switches.
Below shows the execution of the commands on a Catalyst 6500 WS-X6748-GE-TX switch port interface:
C6500#test cable-diagnostics tdr int gi1/1 TDR test started on interface Gi1/1 A TDR test can take a few seconds to run on an interface Use 'show cable-diagnostics tdr' to read the TDR results. C6500# C6500#sh cable-diagnostics tdr int gi1/1 TDR test last run on: August 23 10:48:23 Interface Speed Pair Cable length Distance to fault Channel Pair status --------- ----- ---- ------------------- ------------------- ------- ------------ Gi1/1 1000 1-2 0 +/- 6 m N/A Pair B Terminated 3-6 0 +/- 6 m N/A Pair A Terminated 4-5 0 +/- 6 m N/A Pair D Terminated 7-8 0 +/- 6 m N/A Pair C Terminated C6500#
Detailed command output capture:
C6500#sh ver Cisco IOS Software, s72033_rp Software (s72033_rp-ADVENTERPRISE_WAN-M), Version 12.2(33)SXJ, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2011 by Cisco Systems, Inc. Compiled Thu 17-Mar-11 15:10 by prod_rel_team ROM: System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1) C6500 uptime is 1 hour, 37 minutes Uptime for this control processor is 1 hour, 37 minutes Time since C6500 switched to active is 1 hour, 36 minutes System returned to ROM by reload at 07:23:18 UTC Tue Jun 21 2011 (SP by reload) System image file is "disk0:s72033-adventerprise_wan-mz.122-33.SXJ.bin" Last reload reason: Unknown reason cisco WS-C6509-E (R7000) processor (revision 1.4) with 458720K/65536K bytes of memory. Processor board ID SMC1237001T SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache Last reset from s/w reset 1 Virtual Ethernet interface 48 FastEthernet interfaces 146 Gigabit Ethernet interfaces 1917K bytes of non-volatile configuration memory. 8192K bytes of packet buffer memory. 65536K bytes of Flash internal SIMM (Sector size 512K). Configuration register is 0x2102 C6500# C6500#sh int gi1/1 GigabitEthernet1/1 is up, line protocol is up (connected) Hardware is C6k 1000Mb 802.3, address is 0023.5d23.f000 (bia 0023.5d23.f000) MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 1000Mb/s, media type is 10/100/1000BaseT input flow-control is off, output flow-control is on Clock mode is auto ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:03, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec L2 Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes 11 packets input, 1632 bytes, 0 no buffer Received 3 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 0 input packets with dribble condition detected 3 packets output, 1770 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped out C6500# C6500#sh int gi1/1 capabilities GigabitEthernet1/1 Model: WS-X6748-GE-TX Type: 10/100/1000BaseT Speed: 10,100,1000,auto Duplex: half,full Trunk encap. type: 802.1Q,ISL Trunk mode: on,off,desirable,nonegotiate Channel: yes Broadcast suppression: percentage(0-100) Flowcontrol: rx-(off,on,desired),tx-(off,on,desired) Membership: static Fast Start: yes QOS scheduling: rx-(1q8t), tx-(1p3q8t) QOS queueing mode: rx-(cos), tx-(cos) CoS rewrite: yes ToS rewrite: yes Inline power: no Inline power policing: no SPAN: source/destination UDLD yes Link Debounce: yes Link Debounce Time: no Ports-in-ASIC (Sub-port ASIC) : 1-24 (1-12) Remote switch uplink: no Dot1x: yes Port-Security: yes C6500# C6500#conf t Enter configuration commands, one per line. End with CNTL/Z. C6500(config)#logging event link-status default C6500(config)#end C6500# C6500#test ? aaa AAA Authentication, Authorization and Accounting accelerated-cef Test accelerated cef (Gemini) appletalk APPLETALK diagnostic code autoshut Autoshut test command beep BEEP agents cable-diagnostics Cable Diagnostics on Interface cef Cisco Express Forwarding test command checkpoint Checkpoint Facility test commands cisp Test CISP protocol cwoir CWAN OIR test commands diagnostic Diagnostic commands dsp Test DSP functions em Event Manager Test epm EPM CTS test fallback Fallback test fm Test FM glbp Gateway Load Balancing Protocol test commands heartbeat Heartbeat test commands hw-module Test hardware module commands icc ICC test commands iccshim ICCSHIM test commands ifs IFS TEST code interfaces Network interfaces ip IP test commands iphc IPHC testing ipmobile IP Mobility Test commands l3-mgr Test l3 mgr API lacp Link Aggregation Control Protocol lbl-sync Line by Line command sync info lcc linecard configuration commands mcm MDR Card Manager monitor monitor test commands mpls MPLS test commands oer Test Optimized Edge Routing (OER) oir OIR test commands pasvc PPP over ATM SVC Test Driver platform Test platform information pm Port Manager test commands rpc RPC test commands sasl Test SASL code. scp SCP test commands snmp snmp set test command ssm SSM test commands sw-vlan Test VLAN Manager feature track Object Tracking test commands tunnel Test tunnel upgrade Test FPD image upgrade features vines VINES diagnostic code wism WiFi Services Module xdr Test XDR communication C6500#test cable-diagnostics ? tdr test TDR on interface C6500#test cable-diagnostics tdr ? interface Specify an interface for TDR test module Run TDR test on all the ports for the module C6500#test cable-diagnostics tdr int gi1/1 TDR test started on interface Gi1/1 A TDR test can take a few seconds to run on an interface Use 'show cable-diagnostics tdr' to read the TDR results. C6500# 10:48:23.983: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to down 10:48:23.995: %LINK-3-UPDOWN: Interface GigabitEthernet1/1, changed state to down 10:48:23.991: %LINEPROTO-SP-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to down 10:48:23.999: %LINK-SP-3-UPDOWN: Interface GigabitEthernet1/1, changed state to down 10:48:27.327: %LINK-3-UPDOWN: Interface GigabitEthernet1/1, changed state to up 10:48:27.331: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to up 10:48:27.335: %LINK-SP-3-UPDOWN: Interface GigabitEthernet1/1, changed state to up 10:48:27.339: %LINEPROTO-SP-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to up C6500# C6500#sh cable-diagnostics tdr int gi1/1 TDR test last run on: August 23 10:48:23 Interface Speed Pair Cable length Distance to fault Channel Pair status --------- ----- ---- ------------------- ------------------- ------- ------------ Gi1/1 1000 1-2 0 +/- 6 m N/A Pair B Terminated 3-6 0 +/- 6 m N/A Pair A Terminated 4-5 0 +/- 6 m N/A Pair D Terminated 7-8 0 +/- 6 m N/A Pair C Terminated C6500#
Below lists the TDR usage guidelines:
= TDR can test cables for connectivity problems for up to a maximum length of 115 meters.
= Link state will be affected during TDR test.
= Do not start the test at the same time on both ends of the cable. Starting the test at both ends of the cable at the same time can results in misleading results.
= Do not change the port configuration during the TDR test, as this may result in misleading results.
= The interface must be enabled (no shutdown) before performing the TDR test.
C3750#test cable-diagnostics tdr int gi1/0/1
% Interface Gi1/0/1 is administratively down
% Use 'no shutdown' to enable interface before TDR test start.
C3750#
= If the port speed is 1000Mbps / 1Gbps and the link is up, do not disable the auto-MDIX feature.= For fixed 10/100Mbps ports, disable the auto-MDIX feature on both sides of the cable before performing the TDR test. Failure to do so can result in misleading results.
= For all other conditions, the auto-MDIX feature must be disabled on both ends of the cable. Failure to disable auto-MDIX will interfere with the TDR test and results in misleading results.
= If the link partner has auto-MDIX enabled, it will interfere with the TDR test and results in misleading results. The workaround is to disable auto-MDIX on the link partner.
Below shows the execution of the commands on a Catalyst 3750 switch port interface:
SW2#sh run int fa1/0/1 Building configuration... Current configuration : 49 bytes ! interface FastEthernet1/0/1 no mdix auto end SW2# ================================================================================ SW1#sh cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone, D - Remote, C - CVTA, M - Two-port Mac Relay Device ID Local Intrfce Holdtme Capability Platform Port ID SW2 Gig 1/0/1 146 S I WS-C3750- Fas 1/0/1 SW1# SW1#sh run int gi1/0/1 Building configuration... Current configuration : 52 bytes ! interface GigabitEthernet1/0/1 no mdix auto end SW1# SW1#sh int gi1/0/1 GigabitEthernet1/0/1 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 0022.552d.f481 (bia 0022.552d.f481) MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:08, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 117 packets input, 17514 bytes, 0 no buffer Received 103 broadcasts (103 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 103 multicast, 0 pause input 0 input packets with dribble condition detected 43 packets output, 10677 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped out SW1# SW1#test cable-diagnostics tdr int gi1/0/1 Link state may be affected during TDR test TDR test started on interface Gi1/0/1 A TDR test can take a few seconds to run on an interface Use 'show cable-diagnostics tdr' to read the TDR results. SW1# SW100:23:47.078: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down SW100:23:48.084: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down SW100:23:51.868: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up SW100:23:52.874: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up SW1# SW1#sh cable-diagnostics tdr int gi1/0/1 TDR test last run on: March 01 00:23:46 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/1 100M Pair A N/A Pair B Normal Pair B N/A Pair A Normal Pair C 1 +/- 2 meters Pair D Short Pair D 1 +/- 2 meters Pair C Short SW1#
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