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100-Gigabit Ethernet OTN Options Configuration Overview

PTX Series routers support optical transport network (OTN) interfaces, including the 100-Gigabit Ethernet DWDM OTN PIC, and support:

  • Transparent transport of two 100-Gigabit Ethernet signals with Optical Channel Transport Unit 4 (OTU4) framing

  • International Telecommunications Union (ITU)-standard OTN performance monitoring and alarm management

  • Dual polarization quadrature phase shift keying (DP-QPSK) modulation and soft-decision forward error correction (SD-FEC) for long haul and metro applications

  • Pre-forward error correction (pre-FEC)-based bit error rate (BER). Fast reroute (FRR) uses the pre-FEC BER as an indication of the condition of an OTN link

Use the set optics-options statement at the [edit interfaces interfaceType-fpc/pic/port] hierarchy level to configure the optics options.

You can optionally configure pre-FEC BER monitoring as a condition for MPLS FRR. Pre-FEC BER FRR uses pre-FEC BER as an indication of the condition of an optical transport network (OTN) link. When the pre-FEC BER degrade threshold is reached, the PIC stops forwarding packets to the remote interface and raises an interface alarm. Ingress packets continue to be processed. When Pre-FEC BER FRR is used with MPLS FRR or another link protection method, traffic is then rerouted to a different interface. The BER threshold and duration for calculating the BER can be configured by the user. Use the set signal-degrade statement at the [edit interfaces interfaceType-fpc/pic/port otn-options] hierarchy level to configure the BER threshold. Use the set signal-degrade-monitor-enable statement at the [edit interfaces interfaceType-fpc/pic/port otn-options preemptive-fast-reroute] hierarchy level to enable signal degrade monitoring.

You can optionally enable backward FRR to inject local pre-FEC status into the transmitted OTN frames, notifying the remote interface. The remote interface then reroutes traffic to a different interface. When you use pre-FEC BER FRR and backward FRR, notification of signal degradation and rerouting of traffic can occur in less time than through a Layer 3 protocol. Use the set backward-frr-enable statement at the [edit interfaces interfaceType-fpc/pic/port otn-options preemptive-fast-reroute] hierarchy level.

Note:

The backward FRR feature works only between two Juniper Networks 100-Gbps DWDM OTN PICs.

MX2020, MX2010, MX960, MX480, and MX240 routers support OTN interfaces on MPC5E and MPC6E. MPC5E-100G10G and MPC5EQ-100G10G support 100-Gigabit Ethernet OTN interfaces and 10-Gigabit Ethernet OTN interfaces on MX240, MX480, and MX960 routers. The OTN MIC MIC6-100G-CFP2 on MPC6E supports OTN on 100-Gigabit Ethernet interfaces on MX2020 and MX2010 routers. OTN support on the specified MX Series routers includes:

  • International Telecommunications Union (ITU)-standard OTN performance monitoring and alarm management

  • Transparent transport of two 100-Gigabit Ethernet signals with optical channel transport unit 4 (OTU4) framing.

  • Generic forward error correction (Generic FEC)

To configure the OTN options for PTX Series routers and specific MX Series routers, use the set otn-options statement at the [edit interfaces interfaceType-fpc/pic/port] hierarchy level.

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