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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.
TDR is not intended to be used 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.
To test and display TDR results, use the following commands.
1. To test for cable faults on the TenGigabitEthernet cable.
EXEC Privilege mode
tdr-cable-test tengigabitethernet slot/port/subport
Between two ports, do not start the test on both ends of the cable.
Enable the interface before starting the test.
Enable the port to run the test or the test prints an error message.
2. Displays TDR test results.
EXEC Privilege mode
show tdr tengigabitethernet slot/port/subport
Non Dell-Qualified Transceivers
The system supports Dell-qualified transceivers and only some of the non Dell-qualified transceivers.
If the system displays an error message similar to the following, the transceiver is not Dell-qualified. The Dell EMC Networking
OS places the interface in error-disabled (operationally down) state.
Apr 29 05:09:16: %S4048-ON:1 %IFAGT-2-TRANSCEIVER_UNSUPPORTED_ERROR: Transceiver in slot
1 port 50 unrecognized, putting interface in operational-down state
The following command output displays that the interface is in error-disabled state:
DellEMC#show interfaces fortyGigE 1/50
fortyGigE 1/50 is up, line protocol is down(error-disabled[Transceiver Unsupported])
Hardware is DellEMCEth, address is 34:17:eb:f2:25:c6
Current address is 34:17:eb:f2:25:c6
Non-qualified pluggable media present, QSFP type is 40GBASE-SR4
Wavelength is 850nm
No power
Interface index is 2103813
Internet address is not set
Mode of IPv4 Address Assignment : NONE
DHCP Client-ID :3417ebf225c6
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 40000 Mbit
<output truncated for brevity>
For information about which optics and transceivers are supported, contact your Dell representative.
Splitting 40G Ports without Reload
You can split 40G interfaces into 10G ports without reboot. You can also combine the split ports to create a 40G port without
reload.
● On a device, fan-out profile constructs automatically with default 24 ports
(2,4,6,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,27,29,31) . These ports can be changed to 40G to 10G mode or
vice-versa without reload.
● When a non-supported profile release is upgraded to a supported profile release, the fan-out configured ports get
automatically included in the profile. In fan-out mode, if a system is upgraded with 25 or 26 ports, only 24 ports get upgraded
to fan-out mode. The rest of the ports are put to default 40G mode.
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Interfaces