How to show interface transceiver details on Brand Switches?

Initial Published: February 2, 2023

Most brands’ ethernet switches provide features to show interface transceiver details information via CLI (Command-Line Interface). Generally, you can use those commands to view specific transceiver vendor names, types, wavelength, distance, Serial Number, Part Number, and DDM/DOM parameters. 

It’s helpful to quickly identify the plugged-in SFP transceiver hardware details. These commands also help troubleshoot faults and monitor the transceiver’s status in real-time. 

Although most of the commands were similar, they varied on different brands. Therefore, using many switches from other brands may confuse those commands.

Next, let’s take some popular switches, such as Cisco, HPE, Brocade, and Juniper, and list the commands to show the detailed transceiver information. We have compiled the most commonly used CLIs in one place, helping you save time searching for them across different brand support documents.

Show transceiver details on Cisco Switches

show interfaces transceiver

‘show interfaces transceiver‘ will display the transceiver diagnosis (DOM) information, including the below five parameters:

• Temperature  
• Voltage  
• Current   
• Tx Power  
• Rx Power

However, if the SFP transceiver has no DOM function, this command can not display that information.

Following is an output example of “show interfaces transceiver“.

C3750>show interfaces transceiver
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
Optical Optical
Temperature Voltage Current Tx Power Rx Power
Port (Celsius) (Volts) (mA) (dBm) (dBm)
------- ----------- ------- -------- -------- --------
Gi1/0/1 12.1 3.28 3.5 -4.0 N/A

Following is an output example of “show interfaces transceiver details“.

C3750>show interfaces transceiver detail
mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
A2D readouts (if they differ), are reported in parentheses.
The threshold values are calibrated.
High Alarm High Warn Low Warn Low Alarm
Temperature Threshold Threshold Threshold Threshold
Port (Celsius) (Celsius) (Celsius) (Celsius) (Celsius)
------- ------------------ ---------- --------- --------- ---------
Gi1/0/1 18.7 90.0 85.0 -5.0 -10.0
High Alarm High Warn Low Warn Low Alarm
Voltage Threshold Threshold Threshold Threshold
Port (Volts) (Volts) (Volts) (Volts) (Volts)
------- --------------- ---------- --------- --------- ---------
Gi1/0/1 3.28 3.70 3.60 3.00 2.90
High Alarm High Warn Low Warn Low Alarm
Current Threshold Threshold Threshold Threshold
Port (milliamperes) (mA) (mA) (mA) (mA)
------- ----------------- ---------- --------- --------- ---------
Gi1/0/1 3.6 15.0 12.0 2.0 1.0
Optical High Alarm High Warn Low Warn Low Alarm
Transmit Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
------- ----------------- ---------- --------- --------- ---------
Gi1/0/1 -4.0 -17788.-32768 -2.9 -9.5 -13.4
Optical High Alarm High Warn Low Warn Low Alarm
Receive Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
------- ----------------- ---------- --------- --------- ---------
Gi1/0/1 N/A 3.0 -17788.-32768 -16.9 -21.0

Show transceiver details on Cisco SMB Switches

However, the command for Cisco SMB switches differs from the above. 

The command is like this:

show fiber-ports optical-transceiver[interface interface-id]

To access the Cisco switch’s privileged EXEC mode, use the ‘fiber-ports-optical-transceiver’ CLI. The Output Power (mWatt) field in the command output represents the optical module’s transmit power. In contrast, the Input Power (mWatt) field indicates the received power.

Show transceiver details on HPE Switches

Display general transceiver information on HPE Aruba switches by using this command:

Show interfaces transceiver

This command output example is displayed below.

Display detailed interface transceiver information on HPE Aruba switches by using this command:

Show interfaces transceiver detail 

This command output example is displayed below.

Show transceiver details on Brocade Switches

sfpShow

This ‘sfpShow‘ command displays a list of all installed SFP modules without operands. It also displays the SFP type, wavelength, vendor name, serial number, and the port’s speed capability in Gbps. 

When used with a port number, this’ sfpShow’ command provides detailed information about the Serial ID SFPs in the specified port.

The sfpShow output is displayed below.

Show transceiver details on Juniper Switches

show interfaces diagnostics optics 

The sample output is displayed below.

user@switch> show interfaces diagnostics optics ge-0/1/0
Physical interface: ge-0/1/0
Laser bias current : 5.444 mA
Laser output power : 0.3130 mW / -5.04 dBm
Module temperature : 36 degrees C / 97 degrees F
Module voltage : 3.2120 V
Receiver signal average optical power : 0.3840 mW / -4.16 dBm
Laser bias current high alarm : Off
Laser bias current low alarm : Off
Laser bias current high warning : Off
Laser bias current low warning : Off
Laser output power high alarm : Off
Laser output power low alarm : Off
Laser output power high warning : Off
Laser output power low warning : Off
Module temperature high alarm : Off
Module temperature low alarm : Off
Module temperature high warning : Off
Module temperature low warning : Off
Module voltage high alarm : Off
Module voltage low alarm : Off
Module voltage high warning : Off
Module voltage low warning : Off
Laser rx power high alarm : Off
Laser rx power low alarm : Off
Laser rx power high warning : Off
Laser rx power low warning : Off
Laser bias current high alarm threshold : 15.000 mA
Laser bias current low alarm threshold : 1.000 mA
Laser bias current high warning threshold : 12.000 mA
Laser bias current low warning threshold : 2.000 mA
Laser output power high alarm threshold : 0.6300 mW / -2.01 dBm
Laser output power low alarm threshold : 0.0660 mW / -11.80 dBm
Laser output power high warning threshold : 0.6300 mW / -2.01 dBm
Laser output power low warning threshold : 0.0780 mW / -11.08 dBm
Module temperature high alarm threshold : 109 degrees C / 228 degrees F
Module temperature low alarm threshold : -29 degrees C / -20 degrees F
Module temperature high warning threshold : 103 degrees C / 217 degrees F
Module temperature low warning threshold : -13 degrees C / 9 degrees F
Module voltage high alarm threshold : 3.900 V
Module voltage low alarm threshold : 2.700 V
Module voltage high warning threshold : 3.700 V
Module voltage low warning threshold : 2.900 V
Laser rx power high alarm threshold : 1.2589 mW / 1.00 dBm
Laser rx power low alarm threshold : 0.0100 mW / -20.00 dBm
Laser rx power high warning threshold : 0.7939 mW / -1.00 dBm
Laser rx power low warning threshold : 0.0157 mW / -18.04 dBm

Show transceiver details on Dell Switches

show interfaces [interface number] transceiver

Like the above CLI, you must add “interface number” to the command to check the detailed transceiver information.

Show transceiver details on UniFi Switches

show fiber-ports optics all

This command allows you to check the SFP optics diagnostics.

Show transceiver details on MikroTik Switches

interface ethernet monitor 

Users can access link rate, duplex mode, and detailed diagnostic information by entering this command in the MikroTik switches.

Show transceiver details on Arista Switches

show interfaces transceiver dom 

This CLI command shows the transceiver’s Digital Optical Monitoring (DOM) parameters on Arista switches.

show interfaces transceiver dom thresholds 

This CLI command shows the transceiver’s Digital Optical Monitoring (DOM) parameters and thresholds on Arista switches. The threshold includes the high alarm, high warning, low alarm, and low warning value of temperature, voltage, bias current, TX power, RX power, etc.

Show SFP details on Netgear Switches

This CLI command “show fiber-ports optics” helps you check the SFP Digital Optical Monitoring (DOM) parameters on Netgear switches.

This CLI command “show fiber-ports optics-diag” allows you to display the SFP’s diagnostic data in raw format.

This CLI command, “show fiber-ports optics-eeprom,” allows you to check the SFP’s EEPROM information, including the vendor_name, serial number, date code, and part number.

show fiber-ports optics
show fiber-ports optics-diag
show fiber-ports optics-eeprom
show fiber-ports optics-info

Show SFP details on Fortinet Switches

This CLI command, “# get system interface transceiver,” helps you check the SFP module details on some Fortinet FortiGate D-series that run FortiOS 5.4.x.    

# get system interface transceiver

This CLI command below allow you check the SFP module summary on FortiSwitch interface or switchport. The second CLI allow you check the detailed information of this fiber SFP.

diagnose switch-controller switch-info modules summary
diagnose switch-controller switch-info modules detail

Show transceiver details on Nvidia/Mellanox Switches

Nvidia completed its purchase of Mellanox Technologies in 2020. With this acquisition, Nvidia gained Mellanox’s InfiniBand and Ethernet product lines, which were added to Nvidia’s networking division. As a result, the switches we now call Nvidia switches are actually based on Mellanox switches. Many switch commands from Mellanox are still being used.

Use this command to show the transceiver DDM/DOM paramters.

show interfaces ethernet transceiver diagnostics

The sample output is displayed below.

switch (config) # show interfaces ethernet 2/5 transceiver diagnosticsPort 1/5 transceiver diagnostic data:
  Temperature (-127C to +127C):
    Temperature          : 29 C
    Hi Temp Alarm Thresh : 80 C
    Low Temp Alarm Thresh: -10 C
    Temperature Alarm    : None  Voltage ( 0 to 6.5535 V):
    Voltage              : 3.29180 V
    Hi Volt Alarm Thresh : 3.50000 V
    Low Volt Alarm Thresh: 3.10000 V
    Voltage Alarm        : None  Tx Bias Current ( 0 to 131 mA):
    Ch1 Tx Current          : 6.60000 mA
    Ch2 Tx Current          : 6.60000 mA
    Ch3 Tx Current          : 6.60000 mA
    Ch4 Tx Current          : 6.60000 mA
    Hi Tx Crnt Alarm Thresh : 8.50000 mA
    Low Tx Crnt Alarm Thresh: 5.49200 mA
    Ch1 Tx Current Alarm    : None
    Ch2 Tx Current Alarm    : None
    Ch3 Tx Current Alarm    : None
    Ch4 Tx Current Alarm    : None  Tx Power ( 0 mW to 6.5535 mW / 8.1647 dBm):
    Ch1 Tx Power             : 1.01420 mW / 0.06124 dBm
    Ch2 Tx Power             : 0.96740 mW / -0.14394 dBm
    Ch3 Tx Power             : 0.96730 mW / -0.14439 dBm
    Ch4 Tx Power             : 0.96050 mW / -0.17503 dBm
    Hi Tx Power Alarm Thresh : 3.46730 mW / 5.39991 dBm
    Low Tx Power Alarm Thresh: 0.07240 mW / -11.40261 dBm
    Ch1 Tx Power Alarm       : None
    Ch2 Tx Power Alarm       : None
    Ch3 Tx Power Alarm       : None
    Ch4 Tx Power Alarm       : None  Rx Power ( 0 mW to 6.5535 mW / 8.1647 dBm):
    Ch1 Rx Power             : 0.99160 mW / -0.03663 dBm
    Ch2 Rx Power             : 1.06080 mW / 0.25633 dBm
    Ch3 Rx Power             : 1.09810 mW / 0.40642 dBm
    Ch4 Rx Power             : 0.97500 mW / -0.10995 dBm
    Hi Rx Power Alarm Thresh : 3.46730 mW / 5.39991 dBm
    Low Rx Power Alarm Thresh: 0.04670 mW / -13.30683 dBm
    Ch1 Rx Power Alarm       : None
    Ch2 Rx Power Alarm       : None
    Ch3 Rx Power Alarm       : None
    Ch4 Rx Power Alarm       : None  Vendor Date Code (dd-mm-yyyy): 02-14-2020

Use this command to show the transceiver general information like the type, vendor, part number, distance etc.

show interfaces ethernet [<inf>] transceiver

switch (config) # show interfaces ethernet 1/1 transceiver
Port 1/1 state
        identifier             : QSFP+
        cable/module type      : Optical cable/module
        ethernet speed and type: 40GBASE - SR4
        vendor                 : Mellanox
        cable_length           : 50 m
        part number            : MC2210411-SR4
        revision               : A1
        serial number          : TT1151-00006

Show transceiver details on Check Point Switches

A bit different from other brand commands. Please use this command to show the transceiver general information.

show interfaces xcvr

However, if you want to show the detailed DDM/DOM parameters, use the following command. This command allows you to view detailed information for all transceivers and their corresponding ports.

show interfaces xcvr_detail

Show transceiver details on Nokia Switches

A bit different from other brand commands. Please use this command to show the transceiver general information.

show port port-id detail

For example, use this specific CLI to show the port transceiver details.

show port 2/1/18 detail

Show transceiver details on D-Link Switches

D-Link focuses more on home networks and small and medium-sized enterprise networks, so many users may not need to use commands to query optical transceiver information. However, some professional users and medium-sized enterprise network users may need to use this command. You can try the following commands on the switch to view specific information about SFP/QSFP and other optical transceivers.

show fiber-ports optical-transceiver

Show transceiver details on TP-Link Switches

Use the command below to check the SFP/QSFP transceivers information on TP-Link switches. Please note that this only applies to modules with DDM/DOM function. Also check if you have enable the DDM feature on the SFP port before use this command.

Switch(config)#show ddm status

Description of the output fields

The below table lists the most critical fields for the interface transceiver command. Most brands share a similar name, but others may have different descriptions.

Field Name	Field Description
Interface Name	Displays the name of the physical interface.
Transceiver Type	Displays the type the optical transceiver.
Connector Type	Displays the connector type of the optical transceiver.
Wavelength	Displays the wavelength of the optical transceiver.
Transfer Distance	Displays the transmission distance of the optical transceiver.
Vendor Name	Displays the vendor name of the optical transceiver.
Product Number	Displays the Vendor part number of the optical transceiver.
Serial Number	Displays the serial number of the optical transceiver.
Temperature	Displays the temperature of the optical transceiver.
Voltage	Displays the Current-voltage of the optical transceiver, in Volts.
Current	Displays the Tx Bias current of the optical transceiver, in milliamperes.
Tx Power	Lower bias current threshold of the optical transceiver.
RX Power	Current receive power of the optical transceiver.

Read more:

• What is SFP Module? An Ultimate Guide
• How to calculate the Fiber Link budget?
• What is Digital Diagnostic Monitoring (DDM)

Reference

• https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet-switches/topics/ref/command/show-interfaces-diagnostics-optics-ex-series.html
• https://sc1.checkpoint.com/documents/R81.20/WebAdminGuides/EN/CP_R81.20_Gaia_AdminGuide/Content/Topics-GAG/Monitoring-Transceivers.htm