Re: constant FEC errors juniper mpc10e 400g

[Aaron Gould <aaron1 () gvtc com>]

i did.  Usually my NANOG and J-NSP email list gets me a quicker solution 
than JTAC.

-Aaron

On 4/17/2024 2:37 PM, Dominik Dobrowolski wrote:
> Open a JTAC case,
> That looks like a work for them
>
>
> Kind Regards,
> Dominik
>
> W dniu śr., 17.04.2024 o 21:36 Aaron Gould <aaron1 () gvtc com> napisał(a):
>
>     We recently added MPC10E-15C-MRATE cards to our MX960's to upgrade our core to 400g.  During initial testing of the 400g 
> interface (400GBASE-FR4), I see constant FEC errors.  FEC is new to me.  Anyone know why this is occurring?  Shown below, is an 
> interface with no traffic, but seeing constant FEC errors.  This is (2) MX960's cabled directly, no dwdm or anything between 
> them... just a fiber patch cable.
>
>
>
>     {master}
>     me@mx960> clear interfaces statistics et-7/1/4
>
>     {master}
>     me@mx960> show interfaces et-7/1/4 | grep rror | refresh 2
>     ---(refreshed at 2024-04-17 14:18:53 CDT)---
>        Link-level type: Ethernet, MTU: 1514, MRU: 1522, Speed: 400Gbps, BPDU Error: None, Loop Detect PDU Error: None, 
> Loopback: Disabled, Source filtering: Disabled,
>          Bit errors                             0
>          Errored blocks                         0
>        Ethernet FEC statistics              Errors
>          FEC Corrected Errors                    0
>          FEC Uncorrected Errors                  0
>          FEC Corrected Errors Rate               0
>          FEC Uncorrected Errors Rate             0
>     ---(refreshed at 2024-04-17 14:18:55 CDT)---
>        Link-level type: Ethernet, MTU: 1514, MRU: 1522, Speed: 400Gbps, BPDU Error: None, Loop Detect PDU Error: None, 
> Loopback: Disabled, Source filtering: Disabled,
>          Bit errors                             0
>          Errored blocks                         0
>        Ethernet FEC statistics              Errors
>          FEC Corrected Errors                 4302
>          FEC Uncorrected Errors                  0
>          FEC Corrected Errors Rate               8
>          FEC Uncorrected Errors Rate             0
>     ---(refreshed at 2024-04-17 14:18:57 CDT)---
>        Link-level type: Ethernet, MTU: 1514, MRU: 1522, Speed: 400Gbps, BPDU Error: None, Loop Detect PDU Error: None, 
> Loopback: Disabled, Source filtering: Disabled,
>          Bit errors                             0
>          Errored blocks                         0
>        Ethernet FEC statistics              Errors
>          FEC Corrected Errors                 8796
>          FEC Uncorrected Errors                  0
>          FEC Corrected Errors Rate             146
>          FEC Uncorrected Errors Rate             0
>     ---(refreshed at 2024-04-17 14:18:59 CDT)---
>        Link-level type: Ethernet, MTU: 1514, MRU: 1522, Speed: 400Gbps, BPDU Error: None, Loop Detect PDU Error: None, 
> Loopback: Disabled, Source filtering: Disabled,
>          Bit errors                             0
>          Errored blocks                         0
>        Ethernet FEC statistics              Errors
>          FEC Corrected Errors                15582
>          FEC Uncorrected Errors                  0
>          FEC Corrected Errors Rate             111
>          FEC Uncorrected Errors Rate             0
>     ---(refreshed at 2024-04-17 14:19:01 CDT)---
>        Link-level type: Ethernet, MTU: 1514, MRU: 1522, Speed: 400Gbps, BPDU Error: None, Loop Detect PDU Error: None, 
> Loopback: Disabled, Source filtering: Disabled,
>          Bit errors                             0
>          Errored blocks                         0
>        Ethernet FEC statistics              Errors
>          FEC Corrected Errors                20342
>          FEC Uncorrected Errors                  0
>          FEC Corrected Errors Rate             256
>          FEC Uncorrected Errors Rate             0
>
>     {master}
>     me@mx960> show interfaces et-7/1/4 | grep "put rate"
>        Input rate     : 0 bps (0 pps)
>        Output rate    : 0 bps (0 pps)
>
>     {master}
>     me@mx960> show interfaces et-7/1/4
>     Physical interface: et-7/1/4, Enabled, Physical link is Up
>        Interface index: 226, SNMP ifIndex: 800
>        Link-level type: Ethernet, MTU: 1514, MRU: 1522, Speed: 400Gbps, BPDU Error: None, Loop Detect PDU Error: None, 
> Loopback: Disabled, Source filtering: Disabled,
>        Flow control: Enabled
>        Pad to minimum frame size: Disabled
>        Device flags   : Present Running
>        Interface flags: SNMP-Traps Internal: 0x4000
>        Link flags     : None
>        CoS queues     : 8 supported, 8 maximum usable queues
>        Schedulers     : 0
>        Last flapped   : 2024-04-17 13:55:28 CDT (00:36:19 ago)
>        Input rate     : 0 bps (0 pps)
>        Output rate    : 0 bps (0 pps)
>        Active alarms  : None
>        Active defects : None
>        PCS statistics                      Seconds
>          Bit errors                             0
>          Errored blocks                         0
>        Ethernet FEC Mode  :                 FEC119
>        Ethernet FEC statistics              Errors
>          FEC Corrected Errors               801787
>          FEC Uncorrected Errors                  0
>          FEC Corrected Errors Rate            2054
>          FEC Uncorrected Errors Rate             0
>        Link Degrade :
>          Link Monitoring                   :  Disable
>        Interface transmit statistics: Disabled
>
>        Logical interface et-7/1/4.0 (Index 420) (SNMP ifIndex 815)
>          Flags: Up SNMP-Traps 0x4004000 Encapsulation: ENET2
>          Input packets : 1
>          Output packets: 1
>          Protocol inet, MTU: 1500
>          Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 1, Curr new hold cnt: 0, NH drop cnt: 0
>            Flags: Sendbcast-pkt-to-re
>            Addresses, Flags: Is-Preferred Is-Primary
>              Destination:10.10.10.76/30  <http://10.10.10.76/30>, Local: 10.10.10.77, Broadcast: 10.10.10.79
>
>     -- 
>     -Aaron
--
-Aaron