Home Forums MOCHAbin Forum Hardware discussions SFP module identification

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  • #50314

    If you are wondering if your SFP module is recognized, try as root or sudo “ethtool –module-info eth0”. This should display the module type, characteristics, serial number, etc.

    $ sudo ethtool -m eth0
    Identifier : 0x03 (SFP)
    Extended identifier : 0x04 (GBIC/SFP defined by 2-wire interface ID)
    Connector : 0x07 (LC)
    Transceiver codes : 0x00 0x00 0x00 0x01 0x00 0x00 0x00 0x00 0x00
    Transceiver type : Ethernet: 1000BASE-SX
    Encoding : 0x01 (8B/10B)
    BR, Nominal : 1300MBd
    Rate identifier : 0x00 (unspecified)
    Length (SMF,km) : 0km
    Length (SMF) : 0m
    Length (50um) : 550m
    Length (62.5um) : 270m
    Length (Copper) : 0m
    Length (OM3) : 0m
    Laser wavelength : 850nm
    Vendor name : CISCO-OEM
    Vendor OUI : 00:00:00
    Vendor PN : GLC-SX-MM-OSI
    Vendor rev : 2.0
    Option values : 0x00 0x1a
    Option : RX_LOS implemented
    Option : TX_FAULT implemented
    Option : TX_DISABLE implemented
    BR margin, max : 0%
    BR margin, min : 0%
    Vendor SN : ZZ201280353
    Date code : 120128

    Also, you can tell if the link is up using ethtool with no flags on the interface:

    ethtool eth0
    Settings for eth0:
    Supported ports: [ FIBRE ]
    Supported link modes: 1000baseX/Full
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes: 1000baseX/Full
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Speed: 1000Mb/s
    Duplex: Full
    Port: FIBRE
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    Cannot get wake-on-lan settings: Operation not permitted
    Link detected: yes

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