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Understanding the P2-100GE-OTN PIC


Starting with Junos OS Release 14.1R2 and 14.2, a 100-Gigabit Ethernet OTN PIC—P2-100GE-OTN—is supported on the FPC2-PTX-P1A FPC in PTX5000 routers. The P2-100GE-OTN PIC provides 4-port 100-Gigabit Ethernet interfaces, which are independently configurable in LAN PHY framing mode or in optical channel transport unit 4 (OTU4) mode. Each interface is terminated by means of a CFP2 transceiver. The FPC2-PTX-P1A FPC supports two P2-100GE-OTN PICs, in which each 100-Gigabit Ethernet port is mapped to a Packet Forwarding Engine in the FPC.

Starting from Junos OS Release 15.1, you can perform the following on the P2-100GE-OTN PIC on PTX5000 routers:

  • You can configure the interfaces on this PIC to be a part of the mixed rates and mixed mode aggregated Ethernet bundles.

  • Port-based pseudowire class of service (CoS) classification which includes Layer 3 IPv4, IPv6, and MPLS classification for interfaces with ethernet-ccc encapsulation.

The following sections explain this PIC in detail:

Interface Features

The following interface features are supported on a P2-100GE-OTN PIC:

  • 4-port 100-Gigabit Ethernet interfaces, which are independently configurable in LAN PHY framing mode or in OTU4 signal mode. Each interface is terminated by means of a CFP2 transceiver.

  • Each port maps to a single Packet Forwarding Engine in the FPC2-PTX-P1A FPC.

  • The interfaces are named with prefix et.

  • Gigabit Ethernet local loopback.

  • Link-level pause frames—You can halt the Ethernet interface from transmitting packets for a configured period of time.

  • Interface hold timer and interface damping—You can set the hold-time statement (in milliseconds) to damp interface transitions.

  • External clock

  • Nonstandard tag protocol identifier (TPID):

    • For each 100-Gigabit Ethernet port, you can configure up to eight TPIDs by using the tag-protocol-id statement at the [edit interfaces interface-name gigether-options ethernet-switch-profile] hierarchy level.

    • The tag-protocol-id statement can be configured only on the first port (port 0) of the PIC. If any other (nonzero) port has the tag-protocol-id configuration, the Routing Engine registers an error in the system log and the configuration is ignored.

    • The tag-protocol-id statement configured on port 0 of the PIC also applies to the rest of the ports on that PIC.

  • The interface Link Down event always generates an interrupt; however, the interface Link Up event does not generate an interrupt. Therefore, the interface link-up event is detected during the 1-second PIC periodic polling process.

  • Generic forward error correction (GFEC) (G.709) and no-FEC modes of operation.

  • Diagnostics tools:

    • Line loopback

    • Local loopback

  • Fast reroute (FRR)—Based on configurable pre-FEC, bit error rate (BER) is supported and is configured using the ber-threshold-signal-degrade statement at the [edit interfaces interface-name otn-options signal-degrade] hierarchy level.

  • jnx-ifotn.mib and otn-mib as defined in RFC 3591. Note that according to Junos OS security standard, configurable parameters are not supported through SNMP. Only the get operation is available through SNMP.

  • FEC statistics—corrected errors and corrected error ratio.

  • OTN payload pseudorandom binary sequence (PRBS) generation and checking by enabling or disabling PRBS with the prbs or no-prbs statement at the [edit interfaces interface-name otn-options] hierarchy level.

  • Optical channel data unit (ODU)-level delay measurement.

  • At the physical interface level, flexible-ethernet-service, ethernet-ccc, and ethernet-tcc encapsulations are supported. For the flexible-ethernet-service encapsulation, the logical level supports enet2, vlan-ccc, and vlan-tcc encapsulations.

  • At the logical interface level, dix, vlan-ccc, and vlan-tcc encapsulations are supported.

  • Interoperability between 100-Gigabit Ethernet interfaces with CFP transceiver and 100-Gigabit Ethernet interfaces with CFP2 transceiver in LAN PHY framing mode and in OTU4 mode.

The following features are not supported on the P2-100GE-OTN PIC:

  • Source MAC learning for accounting

  • MAC policing

  • Physical interface-level encapsulations—vlan-ccc, extended-vlan-ccc, and extended-vlan-tcc

  • Logical interface-level encapsulation—vlan-vpls

  • VLAN rewrite for ccc encapsulation

  • Per-queue flow control

  • Generic framing procedure-framed (GFP-F) mapping modes over OTN

  • General communication channel (GCC)

  • OTN interface-level Automatic Protection Switching (APS)

  • Insertion, monitoring, and display of OTN header overhead byte

  • Black link MIB for integration with transponders

  • Optical harness support

  • Transport interface and state model (GR-1093)

  • Trace tone support

  • 15-minute and 1-day performance monitoring counters and historic counters

Layer 2 and Layer 3 Features

The following Layer 2 and Layer 3 features are supported on the P2-100GE-OTN PIC:

  • MAC detect link up and link down based on local fault signal or remote fault signal.

  • MAC statistics.

  • Flow control.

  • MAC oversized packet counters based on default MTU value or user-configured MTU value.

  • Per-port destination address MAC filter.

  • Per-port source address MAC filter.

  • Per-physical interface source address MAC filter.

  • Per-logical interface source address MAC accounting.

  • Maximum of 1000 source MAC filter per physical interface.

  • Maximum of 32,000 filter terms to share across all filter features.

  • Aggregated Ethernet supports 64 child links that can be configured using the set chassis aggregated-devices maximum-links configuration command.

  • Maximum of 1024 logical interfaces on an aggregated Ethernet physical interface.

  • Support for VLAN tagging, flexible VLAN tagging, and stacked VLAN tagging.

  • LACP.

  • Link protection.

  • 802.3 ah OAM.

  • 802.1 ag OAM.


  • SNMP.

  • Supports per-VLAN queuing (using Packet Forwarding Engine).

OTN Alarms and Defects

The following OTN alarms and defects are supported on the P2-100GE-OTN PIC:

  • LOS—Loss Of Signal

  • LOF—Loss Of Frame

  • LOM—Loss Of Multiframe

  • OTU—Degrade





  • OTU—Signal Degrade

  • OTU—Signal Fail

  • ODU—Signal Fail

  • OTU-FEC—Degrade

  • OTU-FEC—Excessive errors

  • ODU—Signal Degrade







TCA Alarms

Threshold-crossing alarms (TCA) are alarms that are activated when a certain configurable threshold—near-end measurement threshold or far-end measurement threshold—is crossed and remains so until the end of the 15 minute interval for parameters such as OTU and ODU. The following alarms are supported:

  • Background block error threshold (BBE)

  • Errored seconds threshold (ES)

  • Severely errored seconds threshold (SES)

  • Unavailable seconds threshold (UAS)