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Maintaining MX2020 Packet Forwarding Engine Components

 

Maintaining MX2020 MPCs

Purpose

The router can have up to 20 Modular Port Concentrators (MPCs) mounted vertically in the MPC card cage at the front of the chassis. For optimum router performance, verify the condition of the MPCs.

Action

On a regular basis:

  • Check the LEDs on the craft interface directly above each MPC slot. The green LED labeled OK lights steadily when a MPC is functioning normally.

  • Check the OK/FAIL LED on the MPC. For more information, see MX Series Interface Module Reference. If the MPC detects a failure, the MPC sends an alarm message to the Routing Engine.

  • Check the status of installed MPCs by issuing the CLI show chassis fpc command to check the status of installed MPCs. As shown in the sample output, the value Online in the column labeled State indicates that the MPC is functioning normally:

    user@host> show chassis fpc

    For more detailed output, add the detail option. The following example does not specify a slot number, which is optional:

    user@host> show chassis fpc detail
  • Issue the CLI show chassis fpc pic-status command. The MPC slots are numbered from 0 through 9 (bottom), and 10 through 19 (top), left to right:

    user@host> show chassis fpc pic-status

    For further description of the output from the command, see the Junos OS System Basics and Services Command Reference  .

Maintaining MX2020 MICs

Purpose

For optimum router performance, verify the condition of the Modular Interface Cards (MICs).

Action

On a regular basis:

  • Check the LEDs on MIC faceplates. The meaning of the LED states differs for various MICs. For more information, see the MX Series Interface Module Reference. If the MPC that houses the MIC detects a MIC failure, the MPC generates an alarm message to be sent to the Routing Engine.

  • Issue the CLI show chassis fpc pic-status command. The MIC slots in an MPC are numbered PIC 0/1 and PIC 2/3, top to bottom:

    user@host> show chassis fpc pic-status

    For further description of the output from the command, see the Junos OS System Basics and Services Command Reference  .

Maintaining the MX2020 Ethernet Switch

Purpose

For optimum router performance, verify the status of the Gigabit Ethernet ports connected to MPC devices.

Action

On a regular basis:

Maintaining Cables That Connect to MX2020 MPCs or MICs

Purpose

For optimum router performance, verify the condition of the cables that connect to the MPCs or MICs.

Action

On a regular basis:

  • Use an upper cable manager and a lower cable manager (shown in Figure 1) to support cables and prevent cables from dislodging or developing stress points.

    Figure 1: Upper and Lower Cable Manager Cable Routing
    Upper and Lower
Cable Manager Cable Routing
    Note

    The MX2020 supports both standard and extended upper and lower cable management.

  • Place excess cable out of the way in the upper and lower cable managers. Do not allow fastened loops of cable to dangle from the connector or cable manager because this stresses the cable at the fastening point. Putting fasteners on the loops helps to maintain their shape.

  • Keep the cable connections clean and free of dust and other particles, which can cause drops in the received power level. Always inspect cables and clean them if necessary before connecting an interface.

  • Label both ends of the cables to identify them.

The following guidelines apply specifically to fiber-optic cables:

  • When you unplug a fiber-optic cable, always place a rubber safety plug over the transceiver on the faceplate and on the end of the cable.

  • Anchor fiber-optic cables to avoid stress on the connectors. Be sure to secure fiber-optic cables so that they do not support their own weight as they hang to the floor. Never let fiber-optic cable hang free from the connector.

  • Avoid bending fiber-optic cable beyond its bend radius. An arc smaller than a few inches can damage the cable and cause problems that are difficult to diagnose.

  • Frequent plugging and unplugging of fiber-optic cable into and out of optical instruments can cause damage to the instruments that is expensive to repair. Instead, attach a short fiber extension to the optical equipment. Any wear and tear due to frequent plugging and unplugging is then absorbed by the short fiber extension, which is easy and inexpensive to replace.

  • Keep fiber-optic cable connections clean. Small microdeposits of oil and dust in the canal of the transceiver or cable connector could cause loss of light, reducing signal power and possibly causing intermittent problems with the optical connection.

    To clean the transceivers, use an appropriate fiber-cleaning device, such as RIFOCS Fiber Optic Adaptor Cleaning Wands (part number 946). Follow the directions for the cleaning kit you use.

    After you clean an optical transceiver, make sure that the connector tip of the fiber-optic cable is clean. Use only an approved alcohol-free fiber-optic cable cleaning kit, such as the Opptex Cletop-S Fiber Cleaner. Follow the directions for the cleaning kit you use.