244 | Interfaces
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Figure 13-24. monitor interface Command Example
Maintenance Using TDR
The time domain reflectometer (TDR) is supported on all Dell Force10 switch/routers. TDR is an
assistance tool to resolve link issues that helps detect obvious open or short conditions within any of the
four copper pairs. TDR sends a signal onto the physical cable and examines the reflection of the signal that
returns. By examining the reflection, TDR is able to indicate whether there is a cable fault (when the cable
is broken, becomes unterminated, or if a transceiver is unplugged).
TDR is useful for troubleshooting an interface that is not establishing a link, that is, when the link is
flapping or not coming up. Do not use TDR on an interface that is passing traffic. When a TDR test is run
on a physical cable, it is important to shut down the port on the far end of the cable. Otherwise, it may lead
to incorrect test results.
Note: TDR is an intrusive test. Do not run TDR on a link that is up and passing traffic.
FTOS#monitor interface tengig 3/1
Dell Force10 uptime is 1 day(s), 4 hour(s), 31 minute(s)
Monitor time: 00:00:00 Refresh Intvl.: 2s
Interface: TenGig 3/1, Disabled, Link is Down, Linespeed is 1000 Mbit
Traffic statistics: Current Rate Delta
Input bytes: 0 0 Bps 0
Output bytes: 0 0 Bps 0
Input packets: 0 0 pps 0
Output packets: 0 0 pps 0
64B packets: 0 0 pps 0
Over 64B packets: 0 0 pps 0
Over 127B packets: 0 0 pps 0
Over 255B packets: 0 0 pps 0
Over 511B packets: 0 0 pps 0
Over 1023B packets: 0 0 pps 0
Error statistics:
Input underruns: 0 0 pps 0
Input giants: 0 0 pps 0
Input throttles: 0 0 pps 0
Input CRC: 0 0 pps 0
Input IP checksum: 0 0 pps 0
Input overrun: 0 0 pps 0
Output underruns: 0 0 pps 0
Output throttles: 0 0 pps 0
m - Change mode c - Clear screen
l - Page up a - Page down
T - Increase refresh interval t - Decrease refresh interval
q - Quit
FTOS#
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