nanog mailing list archives
Re: constant FEC errors juniper mpc10e 400g
From: Matt Erculiani <merculiani () gmail com>
Date: Wed, 17 Apr 2024 13:46:29 -0600
I'm no TAC engineer, but the purpose of FEC is to take and correct errors when the port is going so fast that errors are simply inevitable. Working as Intended. Easier (read: cheaper) to build in some error correction than make the bits wiggle more reliably. No idea if that rate of increment is alarming or not, but you've not yet hit your FEC cliff so you appear to be fine. -Matt On Wed, Apr 17, 2024 at 1:40 PM Dominik Dobrowolski < dobrowolski.domino () gmail com> 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, Local: 10.10.10.77, Broadcast: 10.10.10.79 -- -Aaron
-- Matt Erculiani
Current thread:
- constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Dominik Dobrowolski (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Tom Beecher (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Joel Busch via NANOG (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Matt Erculiani (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Matt Erculiani (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 17)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Thomas Scott (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Tom Beecher (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Mark Tinka (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Aaron Gould (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Tom Beecher (Apr 18)
- Re: constant FEC errors juniper mpc10e 400g Dominik Dobrowolski (Apr 17)