Configuring the Remote Loopback

On the local equipment, the external physical port of the Ethernet service processing board can request the interconnected equipment to perform the loopback. By analyzing the loopback data, the local equipment can realize the fault locating and the link performance detection.

Prerequisites

  • Applicable to the LEM18 board of the OptiX OSN 1800(NA).
  • Applicable to the TBE board of the OptiX OSN 6800A and OptiX OSN 3800A.
  • Applicable to the 11LEX4, 11LEM24 board of the OptiX OSN 6800A, OptiX OSN 3800A, OptiX OSN 8800 T32(NA) and OptiX OSN 8800 T64(NA).
  • Make sure that the OAM auto-discovery succeeds, refer to Enabling the Auto-Discovery Function of IEEE 802.3ah OAM.
  • For the equipment where the loopback is initiated, OAM Working Mode must be set to Active.
  • The equipment that responds to the loopback must have the capability of supporting the remote loopback.

Background Information

  • If a port is capable of responding to loopback, it enters the Respond Loopback of Remote state and reports the loopback responding alarm when receiving the command of enabling the remote loopback function sent from the opposite OAM port. In this case, the equipment that initiates the loopback enters the initiate loopback at local state and reports the loopback initiating alarm.
  • If the port receives the command of disabling the remote loopback function sent by the opposite OAM port, it exits from the respond loopback of remote state and ends the loopback responding alarm. In the meantime, the equipment that initiates the loopback ends the loopback initiating alarm.
  • After the remote loopback function is enabled, normally, service packets, except the OAMPDU, are looped back at the remote end.
  • After using the remote loopback function to complete the fault locating and the link performance detection, you should disable the remote loopback function at the end where the loopback is initiated and then restore the services. At this time, the alarm is automatically cleared.

Procedure

  1. In the NE Explorer, select an Ethernet board and choose Configuration > Ethernet Maintenance > Ethernet Port OAM.
  2. Click OAM Parameter tab. Select the port that needs to initiate a loopback, and click OAM and select Enable Remote LoopbackRemote Side Loopback Enabled.

    After a loopback is initiated at the local port, query the following information on the U2000 Web LCT to determine whether the loopback status of the local port is normal.
    • Loopback status: Normally, the value of the Loopback Status should be Initiate Loopback at Local.
    • The local end reports the ETHOAM_RMT_LOOP alarm, and parameter 4 of the alarm is 0x01 in the Alarm Details dialog box.
    After a loopback is initiated at the opposite port, query the following information on the U2000 Web LCT to determine whether the loopback status of the local port is normal.
    • Loopback status. Normally, the value of the Loopback Status parameter should be Respond Loopback of Remote.
    • The local end reports the ETHOAM_RMT_LOOP alarm, and parameter 4 of the alarm is 0x02 in the Alarm Details dialog box.

Parent topic: Configuring IEEE 802.3ah OAM
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