10GbE/100GbE Link Fault Signaling(LFS) syslog indication for various card types

10GbE LAN-PHY/100GbE supports Link Fault Signaling (LFS) for the purpose of detecting and reporting physical layer fault conditions on transmit and receive ports. 10GbE WAN-PHY uses SONET/SDH LOS and RDI alarms for the same purpose. This article describes how LFS works for each router and FPC card type.

10GbE LAN-PHY/100GbE LFS operates between remote Reconciliation Sublayers (RS) and local RS. Link faults detected between remote RSs and local RSs are received by local RSs. Only the RS originates Remote Fault signals. When this Local Fault status reaches an RS, the RS stops sending MAC data, and continuously generates a Remote Fault status on the transmit data path. When Remote Fault status is received by an RS, the RS stops sending MAC data, and continuously generates Idle control characters. When the RS no longer receives fault status messages, it returns to normal operation, sending MAC data. Junos OS 10GbE LAN-PHY/100GbE interfaces support LFS feature, but it seems that there is remarkable difference on syslog indication of the LFS for various FPC card types.

RS: Reconciliation Sublayer
LOS: Loss of Signal
RDI: Remote Defect Indication

  • MX 10GbE LAN-PHY for both DPC and MPC(MQ based Trio) supports LFS; but local-fault and remote-fault are not logged on syslog.
  • MX/T4000 10GbE LAN-PHY for MPC(XM based Trio) supports LFS and logs its activity on syslog.
  • MX/T4000 100GbE for MPC(XM based Trio) supports LFS and log its activity on syslog.
  • T640/1600 10GbE LAN-PHY for both XENPAK/10GBASE-LR PIC supports LFS and logs its activity on syslog.
  • Finally, MX 10GbE WAN-PHY uses SONET/SDH LOS and RDI alarms for the same purpose, which gets logged on syslog.

No workaround is available. MX MQ based Trio 10GbE LAN-PHY does not log local-fault and remote-fault activity on syslog. We have to set the proper syslog level to see the LF/RF event on syslog.

10GbE LAN-PHY

On MX 10GbE LAN-PHY, both DPC and MPC (MQ based Trio) support LFS. However, they do not log

MX240/480/960

  • FPC:DPCE 4x 10GE R
  • PIC:1x 10GE(LAN/WAN)

MX240/480/960

  • FPC:MPC Type 1 3D Q
  • MIC:3D 2x 10GE XFP

MX80

  • FPC:MPC BUILTIN
  • MIC:4x 10GE XFP

Router xe-1/0/0 Rx cable down:

Router xe-1/0/0 Rx cable connected:

On MX 10GbE LAN-PHY, MPC (XM based Trio) supports LFS, and logs local-fault and remote-fault on syslog.

MX2020

  • FPC:MPCE Type 3 3D
  • MIC:10X10GE SFPP

Router xe-0/2/1 Rx cable down:

Router xe-0/2/1 Rx cable connected:

MX2020

  • FPC: MPC4E 3D 2CGE+8XGE
  • MIC: 4x10GE SFPP

Router xe-9/2/3 Rx cable down:

Router xe-9/2/3 Rx cable connected:

Both XENPAK and 10GBASE-LR support LFS; they log local-fault and remote-fault on syslog.

T640/1600

  • FPC: E-FPC Type 3
  • PIC: 1x 10GE(LAN)/XENPAK-LR

Router ge-6/0/0 Rx cable down:

Router ge-6/0/0 Rx cable connected

T640/1600

  • FPC:E-FPC Type 3
  • PIC:1x 10GE(LAN),10GBASE-LR

Router ge-6/1/0 Rx cable down:

Router ge-6/1/0 Rx cable connected:

T4000

  • FPC: Type 5-3D
  • PIC: 12x10GE (LAN/WAN) SFPP/24x10GE (LAN/WAN) SFPP

On T4000 10GbE LAN-PHY, MPC (XM based Trio) supports LFS, and logs local-fault and remote-fault on syslog.

Router xe-0/1/1 Rx cable down:

Router xe-0/1/1 Rx cable connected:

10GbE WAN-PHY

Both DPC and MPC use SONET/SDH LOS/RDI alarms; they log messages on syslog.

MX240/480/960

  • FPC: DPCE 4x 10GE R
  • PIC: 1x 10GE(LAN/WAN)

MX240/480/960

  • FPC: MPC Type 1 3D Q
  • MIC: 3D 2x 10GE XFP

MX80

  • FPC:MPC BUILTIN
  • MIC:4x 10GE XFP

Router xe-1/2/0 Rx cable down:

Router xe-1/2/0 Rx cable connected:

100GbE

On MX 100GbE, MPC (XM based Trio) supports LFS, and logs local-fault and remote-fault on syslog.

MX2020

  • FPC: MPCE Type 3 3D
  • MIC: 1X100GE CFP

Router et-1/0/0 Rx cable down:

Router et-1/0/0 Rx cable connected:

MX2020

  • FPC: MPC4E 3D 2CGE+8XGE
  • MIC: 1X100GE CFP

Router et-9/1/0 Rx cable down:

Router et-9/1/0 Rx cable connected:

On T4000 100GbE, MPC (XM based Trio) supports LFS, and logs local-fault and remote-fault on syslog.

T4000

  • FPC: Type 5-3D
  • PIC: 1x100GE

Router et-2/0/0 Rx cable down:

Router et-2/0/0 Rx cable connected:

 

About the author

Prasanna

Leave a Comment