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https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/fec-edit-interfaces-optics-options-qfx-series.html

The default value is gfec.

????? to be checked

edit interfaces interface-name optics-options fec ( sdfec | sdfec15 | none);

Ethernet FEC Mode : FEC91

Code Block

title	show command
collapse	true

{master:0}
lab@MRFB_JL_047> show interfaces terse
Interface               Admin Link Proto    Local                 Remote
. . . 
et-0/0/48               up    down
et-0/0/48.0             up    down inet     10.1.34.185/31
et-0/0/49               up    down
et-0/0/49.0             up    down inet     10.1.34.187/31
bme0                    up    up
bme0.0                  up    up   inet     128.0.0.1/2
                                            128.0.0.4/2
                                            128.0.0.63/2
cbp0                    up    up
dsc                     up    up

{master:0}
lab@MRFB_JL_047> show interfaces et-0/0/48
Physical interface: et-0/0/48, Enabled, Physical link is Down
  Interface index: 664, SNMP ifIndex: 530
  Description: SPINE - MRFB_JS_001 - et-1/0/15
  Link-level type: Ethernet, MTU: 9216, LAN-PHY mode, Speed: 100Gbps,
  BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None,
  MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
  Flow control: Disabled, Media type: Fiber
  Device flags   : Present Running Down
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 12 supported, 12 maximum usable queues
  Current address: 3c:8c:93:51:13:35, Hardware address: 3c:8c:93:51:13:35
  Last flapped   : 2020-01-22 16:59:10 UTC (00:27:53 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : LINK
  Active defects : LINK, LOCAL-FAULT
 Pre-emphasis(reg 236/237)
                       Register-value                 0
 Ctle(reg 234/235)
                    Register-value                 0
 Differential-amplitude(reg 238/239)
                        Register-value                 0
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Ethernet FEC Mode  :                  FEC91
  Ethernet FEC statistics              Errors
    FEC Corrected Errors                    0
    FEC Uncorrected Errors                  0
    FEC Corrected Errors Rate               0
    FEC Uncorrected Errors Rate             0
  PRBS Statistics : Disabled
  Interface transmit statistics: Disabled

  Logical interface et-0/0/48.0 (Index 571) (SNMP ifIndex 532)
    Flags: Device-Down SNMP-Traps 0x4004000 Encapsulation: ENET2
    Input packets : 0
    Output packets: 0
    Protocol inet, MTU: 9202
    Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 0,
    Curr new hold cnt: 0, NH drop cnt: 0
      Flags: Sendbcast-pkt-to-re
      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
        Destination: 10.1.34.184/31, Local: 10.1.34.185

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