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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 (PM) 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) to use 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.

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

You can optionally configure pre-FEC BER FRR signal degrade monitoring. With signal degrade monitoring enabled, when the pre-FEC BER threshold is reached, the interface stops forwarding packets to this interface and raises an interface alarm, ingress packets continue to be processed. Traffic is rerouted to a different interface, and the link is shown as down, but the laser is on and OTN frames are still being exchanged. 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 transmitted OTN frames, notifying the remote interface of errors. If backward FRR is also configured on the remote interface, the remote interface reroutes traffic to a different interface. When backward FRR is enabled, notification of signal degradation occurs 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.

You use the show interfaces extensive, show interfaces diagnostics optics (Gigabit Ethernet, 10-Gigabit Ethernet, 40-Gigabit Ethernet, and 100-Gigabit Ethernet), and show interfaces interval commands to view optics and OTN PM information.