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Configuring OTN

 

Use this topic for information about how to configure optical transport network (OTN) interfaces on specific line cards.

Configuring OTN Interfaces on P1-PTX-24-10G-W-SFPP PIC

Starting from Junos OS Release 14.2, a 24–port 10-Gigabit Ethernet OTN PIC—P1-PTX-24-10G-W-SFPP—is supported on the FPC-PTX-P1-A and FPC2-PTX-P1A FPCs in PTX5000 routers, and the FPC-SFF-PTX-P1-A and FPC-SFF-PTX-T FPCsin PTX3000 routers. To configure an OTN interface on the P1-PTX-24-10G-W-SFPP PIC, you must configure interface-specific options and the OTN-related options for the interface.

To configure the interface-specific options:

  1. Go to the [edit interface interface-name] hierarchy level, where interface-name is in the et-fpc/pic/port format.
  2. Configure the VLAN tagging option on the OTN interface to enable the reception and transmission of 802.1Q VLAN-tagged frames on the interface.
  3. Configure the maximum transmission unit (MTU) size in bytes for the interface.
  4. Configure a VLAN ID for the interface.
  5. Configure the family for the interface.
  6. Configure an IP address for the interface.

To configure the OTN-related options on the interface:

  1. Go to the [edit interface interface-name otn-options] hierarchy level:
  2. Enable the OTN mode as OTU2e, OTU1e, or OTU2 for the interface.
    Note

    fixed-stuff-bytes is for OTU2e rate, no-fixed-stuff-bytes is for OTU1e rate and oc192 is for OTU2 rate. OTU2e and OTU1e rates are applicable for LAN PHY framing mode. OTU2 is applicable for WAN PHY framing mode. Framing mode is to set through the set interfaces framing configuration statement.

  3. Enable the laser on the OTN interface. The laser is disabled by default for all OTN interfaces.
  4. Set an trail trace identifier for the source access point and for the destination access point for ODU and OTU on the OTN interface.
  5. Ignore the trigger for the defect or set the hold time.

    Configure the hold time for the defect trigger as:

    • up with a value—Wait for the hold time delay before clearing the alarm when the defect is absent on the OTN interface.

    • down with a value—Wait for the hold time delay before raising the alarm when the defect occurs for the OTN interface.

  6. Enable the threshold crossing alarms for the OTN interface along with the trigger for the defect.
  7. Set the OTN header bytes as a transmit payload type from 0 bytes through 255 bytes for the packets that are transmitted on the OTN interface.
  8. Configure the forward error correction (FEC) mode as Generic Forward Error Correction (GFEC), Enhanced Forward Error Correction (EFEC), Ultra Forward Error Correction (UFEC), or no-FEC (none) for the OTN interface.
  9. Enable a consequent action as listed in the ITU-T G.798 standard for ODU trail trace identifier mismatch (TTIM) on the OTN interface.
  10. Enable a consequent action as listed in the ITU-T G.798 standard for OTU trail trace identifier mismatch (TTIM) on the OTN interface.
  11. Configure the threshold value for signal degradation when an alarm needs to be raised. Configure the threshold value after signal degradation when the alarm needs to be cleared. When you configure the interval along with the ber-threshold-signal-degrade value statement, the bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then BER must stay below the clear threshold for the configured interval after which the alarm is cleared.
  12. Enable the following actions for the preemptive-fast-reroute statement:

    • Backward FRR—Insert the local pre-FEC status into the transmitted OTN frames and monitor the received OTN frames for the pre-FEC status.

    • Monitoring of signal degradation of pre-FEC OTN frames.

Configuring OTN Interfaces on P1-PTX-2-100G-WDM

PTX Series routers support optical transport network (OTN) interfaces, including the 100-Gigabit DWDM OTN PIC (P1-PTX-2-100G-WDM). See 100-Gigabit Ethernet OTN Options Configuration Overview.

To configure the 100-Gigabit DWDM OTN PIC:

  1. Configure the interface wavelength.

    See wavelength.

    Note

    See 100-Gigabit DWDM OTN PIC Integrated Transceiver Optical Interface Specifications for a list of wavelengths supported by the P1-PTX-2-100G-WDM PIC.

  2. Enable the laser.
  3. (Optional) Set the tca.

    See tca.

  4. (Optional) Set the trace identifiers.

    See tti.

  5. (Optional) Specify defect triggers.

    See trigger.

  6. (Optional) Enable VLAN tagging. See Enabling VLAN Tagging.
  7. (Optional) Set the media MTU. See Configuring the Media MTU.
  8. (Optional) Set the unit VLAN ID, family inet, and IP address.
  9. (Optional) Enable pre-FEC BER signal-degrade monitoring and backward fast reroute to monitor the pre-FEC BER status of the link and to insert the local pre-FEC status into transmitted OTN frames.

    See signal-degrade-monitor-enable and backward-frr-enable.

  10. (Optional) Configure the bit error rate (BER) thresholds for signal degradation used for monitoring the pre-forward error correction (pre-FEC) status of the OTN link.

    1. Set the BER signal-degrade threshold.
    2. Set the BER threshold to clear signal-degrade alarms.
    3. Set the time interval for signal-degrade collection. After the BER threshold for signal-degrade is crossed for ten consecutive intervals, an alarm is raised. If the BER threshold for signal-degrade clear is crossed for ten consecutive intervals, the alarm is cleared. For example, if the interval is configured as 10 ms, then the BER must stay above the signal degradation threshold for 100 ms (10 ms * 10 intervals) for the alarm to be raised, or below the clear threshold for 100 ms for the alarm to be cleared.
      Note

      Configuring a high BER threshold for signal degradation and a long interval might cause the internal counter register to be saturated. Such a configuration is ignored by the router, and the default values are used instead. A system log message is logged for this error.

      See ber-threshold-signal-degrade, ber-threshold-clear, and interval.

    Note

    See Understanding Pre-FEC BER Monitoring and BER Thresholds for more information about pre-FEC BER monitoring and determining BER threshold settings.

Configuring OTN Interfaces on P2-100GE-OTN PIC

To configure an OTN interface on the P2-100GE-OTN PIC you must configure interface-specific options and OTN-related options for the interface.

To configure the interface-specific options:

  1. Go to the [edit interface interface-name] hierarchy level, where interface-name is in the et-fpc/pic/port format.
  2. Configure VLAN tagging on the OTN interface to enable the reception and transmission of 802.1Q VLAN-tagged frames on the interface.
  3. Configure the maximum transmission unit (MTU) size in bytes for the interface.
  4. Configure a VLAN ID for the interface.
  5. Configure the family for the interface.
  6. Configure an IP address for the interface.

To configure the OTN-related options on the interface:

  1. Go to the [edit interface interface-name otn-options] hierarchy level:
  2. Enable the laser on the OTN interface. The laser is disabled by default for all OTN interfaces.
  3. Set an trail trace identifier for the source access point and for the destination access point for ODU and OTU on the OTN interface.
  4. Ignore the trigger for the defect or set the hold time.

    Configure the hold time for the defect trigger as:

    • up with a value—Wait for the hold time delay before clearing the alarm when the defect is absent on the OTN interface.

    • down with a value—Wait for the hold time delay before raising the alarm when the defect occurs for the OTN interface.

  5. Enable the threshold crossing alarms for the OTN interface along with the trigger for the defect.
    • In Junos OS Release 14.1R2 only:

    • In Junos OS Release 14.2 and later:

  6. Set the OTN header bytes as a transmit payload type from 0 bytes through 255 bytes for the packets that are transmitted on the OTN interface.
  7. Configure the forward error correction (FEC) mode as Generic Forward Error Correction (GFEC) or none for the OTN interface.
  8. Enable line loopback or local host loopback for the OTN interface.
  9. Enable an ODU locked maintenance signal on the OTN interface to send the signal pattern 01010101.
  10. Enable an ODU open connection indication signal on the OTN interface to send to send the signal pattern 01100110.
  11. Enable a consequent action as listed in the ITU-T G.798 standard for ODU trail trace identifier mismatch (TTIM) on the OTN interface.
  12. Enable a consequent action as listed in the ITU-T G.798 standard for OTU trail trace identifier mismatch (TTIM) on the OTN interface.
  13. Configure the OTN payload pseudorandom binary sequence (PRBS) on the OTN interface.
  14. Configure OTN mode as OTU4 for the OTN interface.
  15. Configure the threshold value for signal degradation when an alarm needs to be raised. Configure the threshold value after signal degradation when the alarm needs to be cleared. When you configure the interval along with the ber-threshold-signal-degrade value statement, the bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then BER must stay below the clear threshold for the configured interval after which the alarm is cleared.
  16. Enable the following actions for the preemptive-fast-reroute statement:

    • Backward FRR—Insert the local pre-FEC status into the transmitted OTN frames and monitor the received OTN frames for the pre-FEC status.

    • ODU backward FRR—Insert the ODU status into the transmitted OTN frames and monitor the received OTN frames for the ODU BER status.

    • Monitoring of signal degradation of pre-FEC OTN frames.

    • Monitoring of signal degradation of ODU BER in the received OTN frames.

  17. Configure the following options for ODU BER signal degradation on the OTN interface:

    • Configure the threshold for signal degradation for ODU BER when an alarm needs to be raised.

    • Configure the threshold for ODU BER after signal degradation when the alarm needs to be cleared.

    • When you configure the interval along with the ber-threshold-signal-degrade value statement, the ODU bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then ODU BER must stay below the clear threshold for the configured interval after which the alarm is cleared.

Configuring OTN Interfaces on MIC3-100G-DWDM MIC

Starting from Junos OS Release 15.1F5, the 100-Gigabit DWDM OTN MIC—MIC3-100G-DWDM—is supported on MPC3E (MX-MPC3E-3D) and MPC3E NG (MPC3E-3D-NG) on the MX240, MX480, MX960, MX2010, and MX2020 routers. To configure an OTN interface on the MIC3-100G-DWDM MIC, you must configure interface-specific options and OTN-related options for the interface.

To configure the interface-specific options:

  1. Configure VLAN tagging at the [edit interface interface-name] hierarchy level, where interface-name is in the et-fpc/pic/portformat.
  2. Configure the maximum transmission unit (MTU) size in bytes for the interface.
  3. Configure a VLAN ID for the interface.
  4. Configure the family for the interface.
  5. Configure an IP address for the interface.

To configure the optics-specific options on the interface:

  1. Specify the optical transmit laser output power in dBm at the [edit interface interface-name optics-options] hierarchy level. The default transmit laser output value is 0 dBm.
  2. Specify the wavelength of the optics in nanometers. For a list of wavelengths supported, see wavelength.

To configure the OTN-specific options on the interface:

  1. At the [edit interfaces interface-name otn-options] enable the laser on the OTN interface. The laser is disabled by default for all OTN interfaces.
  2. Set an trail trace identifier for the source access point and for the destination access point for ODU and OTU on the OTN interface.
  3. By default, triggers are ignored. Specify defect triggers and the set the trigger hold time for the trigger. Possible values for the trigger hold time are as follows: down—Delay before marking interface down when defect occurs (1..65534 milliseconds) and up—Delay before marking interface up when defect is absent (1..65534 milliseconds). Note

    The hold time value only impacts the alarm reporting time and does not mark an interface down when the defect occurs. To mark the interface up or down, you must also configure the physical interface hold time at the [edit interfaces interface-name] hierarchy level.

  4. Enable the threshold crossing alarms for the OTN interface along with the trigger for the defect.
  5. Set the OTN header bytes as a transmit payload type from 0 bytes through 255 bytes for the packets that are transmitted on the OTN interface.
  6. Configure the forward error correction (FEC) mode for the OTN interface. Possible values are: Generic Forward Error Correction (GFEC), or High Gain Forward Error Correction (HGFEC) or Soft Decision Forward Error Correction (SDFEC). The default forward error correction mode is SDFEC.
  7. Enable line loopback or local host loopback for the OTN interface.
  8. Enable an ODU locked maintenance signal on the OTN interface to send the signal pattern 01010101.
  9. Enable an ODU open connection indication signal on the OTN interface to send to send the signal pattern 01100110.
  10. Enable a consequent action as listed in the ITU-T G.798 standard for ODU trail trace identifier mismatch (TTIM) on the OTN interface.
  11. Enable a consequent action as listed in the ITU-T G.798 standard for OTU trail trace identifier mismatch (TTIM) on the OTN interface.
  12. Configure the OTN payload pseudorandom binary sequence (PRBS) on the OTN interface.
  13. Configure the line rate or speed of the OTN signal to OTU4 (100Gbps) for the OTN interface. Note

    If you specify a value other than OTU4, the value is ignored. To verify the line rate, use the show interfaces interface-name extensive command.

  14. Configure the threshold value for signal degradation when an alarm needs to be raised. Configure the threshold value after signal degradation when the alarm needs to be cleared. When you configure the interval along with the ber-threshold-signal-degrade value statement, the bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then BER must stay below the clear threshold for the configured interval after which the alarm is cleared.
  15. Enable the following actions for the preemptive-fast-reroute statement:
    • Backward FRR—Insert the local pre-FEC status into the transmitted OTN frames and monitor the received OTN frames for the pre-FEC status.

    • ODU backward FRR—Insert the ODU status into the transmitted OTN frames and monitor the received OTN frames for the ODU BER status.

    • Monitoring of signal degradation of pre-FEC OTN frames.

    • Monitoring of signal degradation of ODU BER in the received OTN frames.

  16. Configure the following options for ODU BER signal degradation on the OTN interface:

    • Configure the threshold for signal degradation for ODU BER when an alarm needs to be raised.

    • Configure the threshold for ODU BER after signal degradation when the alarm needs to be cleared.

    • When you configure the interval along with the ber-threshold-signal-degrade value statement, the ODU bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then ODU BER must stay below the clear threshold for the configured interval after which the alarm is cleared.

Configuring OTN Interfaces on PTX-5-100G-WDM PIC

Starting from Junos OS Release 15.1F6, the the 5-port 100-Gigabit DWDM OTN PIC—PTX-5-100G-WDM—is supported on the PTX3000 and the PTX5000 routers. To configure an OTN interface on the PTX-5-100G-WDM PIC, you must configure interface-specific options, optics-specific options and OTN-related options for the interface.

To configure the interface-specific options:

  1. Configure VLAN tagging at the [edit interface interface-name] hierarchy level, where interface-name is in the et-fpc/pic/port format.
  2. Configure the maximum transmission unit (MTU) size in bytes for the interface. Possible values: 256 through 16,000.
  3. Set the unit VLAN ID, family and the IP address of the interface. Possible values for the VLAN ID: 1 through 4094. Specify the family as inet.

To configure the optics-specific options on the interface:

  1. Specify the optical transmit laser output power in dBm at the [edit interface interface-name optics-options] hierarchy level. The default transmit laser output value is 0 dBm.
  2. Specify the wavelength of the optics in nanometers. For a list of wavelengths supported, see wavelength.

To configure the OTN-specific options on the interface:

  1. At the [edit interfaces interface-name otn-options] hierarchy level, enable the laser on the OTN interface. The laser is disabled by default for all OTN interfaces.
  2. Set a trail trace identifier for the source access point and for the destination access point for ODU and OTU on the OTN interface.
  3. Specify defect triggers and the set the trigger hold time for the trigger. By default, triggers are ignored. Possible values for the trigger hold time are as follows: down and up.
    • down—Delay before marking interface down when defect occurs (1 through 65534 milliseconds)

    • up—Delay before marking interface up when defect is absent (1 through 65534 milliseconds).

    Note

    The hold time value only impacts the alarm reporting time and does not mark an interface down when the defect occurs. To mark the interface up or down, you must also configure the physical interface hold time at the [edit interfaces interface-name] hierarchy level.

  4. Enable the threshold-crossing alarms (TCAs) for the OTN interface along with the trigger for the defect. Threshold-crossing alarms (TCAs) 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.
  5. Set the OTN header bytes as a transmit payload type from 0 bytes through 255 bytes for the packets that are transmitted on the OTN interface.
  6. Configure the forward error correction (FEC) mode for the OTN interface. Possible values are: generic forward error correction (GFEC), or high-gain forward error correction (HG-FEC) or soft-decision forward error correction (SD-FEC). The default forward error correction mode is SD-FEC.
  7. Enable line loopback or local host loopback for the OTN interface. Loopback testing enables you to verify the connectivity of a circuit. In line loopback, instead of transmitting the signal toward the far-end device, the signal is sent back to the originating router. In local loopback, the signal is transmitted to the channel service unit (CSU) and then to the far-end device.
  8. Enable an ODU locked maintenance signal on the OTN interface to send the signal pattern 01010101.
  9. Enable an ODU open connection indication signal on the OTN interface to send the signal pattern 01100110.
  10. Enable a consequent action as listed in the ITU-T G.798 standard for ODU trail trace identifier mismatch (TTIM) on the OTN interface.
  11. Enable a consequent action as listed in the ITU-T G.798 standard for OTU trail trace identifier mismatch (TTIM) on the OTN interface.
  12. Configure the OTN payload pseudorandom binary sequence (PRBS) on the OTN interface.
  13. Configure the line rate or speed of the OTN signal to otu4 (100 Gbps) for the OTN interface. Note

    If you specify a value other than otu4, the value is ignored. To verify the line rate, use the show interfaces interface-name extensive command.

  14. Configure the threshold value for signal degradation when an alarm needs to be raised. Configure the threshold value after signal degradation when the alarm needs to be cleared. When you configure the interval along with the ber-threshold-signal-degrade value statement, the bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then BER must stay below the clear threshold for the configured interval after which the alarm is cleared.
  15. Enable the following actions for the preemptive-fast-reroute statement:
    • Backward FRR—Insert the local pre-FEC status into the transmitted OTN frames and monitor the received OTN frames for the pre-FEC status.

    • ODU backward FRR—Insert the ODU status into the transmitted OTN frames and monitor the received OTN frames for the ODU BER status.

    • Monitoring of signal degradation of pre-FEC OTN frames.

    • Monitoring of signal degradation of ODU BER in the received OTN frames.

  16. Configure the following options for ODU BER signal degradation on the OTN interface:

    • Configure the threshold for signal degradation for ODU BER when an alarm needs to be raised.

    • Configure the threshold for ODU BER after signal degradation when the alarm needs to be cleared.

    • When you configure the interval along with the ber-threshold-signal-degrade value statement, the ODU bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then ODU BER must stay below the clear threshold for the configured interval after which the alarm is cleared.

Configuring OTN Interface Options on PTX10K-LC1104

The PTX10K-LC1104 line card provides up to 1.2 Tbps packet forwarding for cloud providers, service providers, and enterprises that need coherent dense wavelength-division multiplexing (DWDM) with MACsec security features. The PTX10K-LC1104 line card is supported on Junos OS Release 18.3R1 and later.

Each PTX10K-LC1104 has 6 physical interfaces (ot-x/x/x) that connect to one of three built-in flexible rate optical transponders. Each transponder connects four 100-Gigabit Ethernet logical interfaces (et-x/x/x) to one of three forwarding ASICs.

To configure the optics-specific options on the interface:

  1. Specify the modulation format at the [edit interface interface-name optics-options] hierarchy level.
  2. Specify encoding.
  3. Specify the optical transmit laser output power in dBm. The default transmit laser output value is 0 dBm.
  4. Specify the wavelength of the optics in nanometers. For a list of wavelengths supported, see wavelength.

To configure the OTN-specific options on the interface:

  1. At the [edit interfaces interface-name otn-options] enable the laser on the OTN interface. The laser is disabled by default for all OTN interfaces.
  2. Set an trail trace identifier for the source access point and for the destination access point for ODU and OTU on the OTN interface.
  3. By default, triggers are ignored. Specify defect triggers and the set the trigger hold time for the trigger. Possible values for the trigger hold time are as follows: down—Delay before marking interface down when defect occurs (1..65534 milliseconds) and up—Delay before marking interface up when defect is absent (1..65534 milliseconds). Note

    The hold time value only impacts the alarm reporting time and does not mark an interface down when the defect occurs. To mark the interface up or down, you must also configure the physical interface hold time at the [edit interfaces interface-name] hierarchy level.

  4. Enable the threshold crossing alarms for the OTN interface along with the trigger for the defect.
  5. Set the OTN header bytes as a transmit payload type from 0 bytes through 255 bytes for the packets that are transmitted on the OTN interface.
  6. Configure the forward error correction (FEC) mode for the OTN interface. Possible values are: Generic Forward Error Correction (GFEC), or High Gain Forward Error Correction (HGFEC) or Soft Decision Forward Error Correction (SDFEC). The default forward error correction mode is SDFEC.
  7. Enable line loopback or local host loopback for the OTN interface.
  8. Enable an ODU locked maintenance signal on the OTN interface to send the signal pattern 01010101.
  9. Enable an ODU open connection indication signal on the OTN interface to send to send the signal pattern 01100110.
  10. Enable a consequent action as listed in the ITU-T G.798 standard for ODU trail trace identifier mismatch (TTIM) on the OTN interface.
  11. Enable a consequent action as listed in the ITU-T G.798 standard for OTU trail trace identifier mismatch (TTIM) on the OTN interface.
  12. Configure the OTN payload pseudorandom binary sequence (PRBS) on the OTN interface.
  13. Configure the line rate or speed of the OTN signal to OTU4 (100Gbps) for the OTN interface. Note

    If you specify a value other than OTU4, the value is ignored. To verify the line rate, use the show interfaces interface-name extensive command.

  14. Configure the threshold value for signal degradation when an alarm needs to be raised. Configure the threshold value after signal degradation when the alarm needs to be cleared. When you configure the interval along with the ber-threshold-signal-degrade value statement, the bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then BER must stay below the clear threshold for the configured interval after which the alarm is cleared.
  15. Enable the following actions for the preemptive-fast-reroute statement:
    • Backward FRR—Insert the local pre-FEC status into the transmitted OTN frames and monitor the received OTN frames for the pre-FEC status.

    • ODU backward FRR—Insert the ODU status into the transmitted OTN frames and monitor the received OTN frames for the ODU BER status.

    • Monitoring of signal degradation of pre-FEC OTN frames.

    • Monitoring of signal degradation of ODU BER in the received OTN frames.

  16. Configure the following options for ODU BER signal degradation on the OTN interface:

    • Configure the threshold for signal degradation for ODU BER when an alarm needs to be raised.

    • Configure the threshold for ODU BER after signal degradation when the alarm needs to be cleared.

    • When you configure the interval along with the ber-threshold-signal-degrade value statement, the ODU bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then ODU BER must stay below the clear threshold for the configured interval after which the alarm is cleared.

Release History Table
Release
Description
Starting from Junos OS Release 15.1F6, the the 5-port 100-Gigabit DWDM OTN PIC—PTX-5-100G-WDM—is supported on the PTX3000 and the PTX5000 routers.