Rolling Back the Integration of a T640 Router

Problem

To return the T640 router to its original state as a standalone system after you have transferred control to the TX Matrix router, you can roll back the integration. During the rollback, traffic passing through the router will be interrupted. This procedure uses LCC0 as an example.

Solution

Warning: Do not look directly into a fiber-optic array adapter or a connector at the end of a fiber-optic array cable attached to an adapter. The fiber optics emit laser light that can damage your eyes.

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Take each T640-SIB offline by using one of the following methods:
   • Press and hold the ONLINE/OFFLINE button on the T640-SIB faceplate until the OK LED is not lit.
   • On an external management device connected to the console or auxiliary port of the TX-CIP, issue the request chassis sib offline command:
     user@host> request chassis sib lcc 0 slot 0 offline
3. If the online-expected statement is included at the [edit chassis lcc number] hierarchy level, delete it:
   user@host# delete chassis lcc 0 online-expected
4. Issue the commit synchronize command, and ensure that there are no synchronization errors:
   user@host# commit synchronize
5. Take the T640 router offline:
   user@host> request chassis lcc slot 0 offline
6. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
7. Remove the control plane connections between the TX-CIPs and the T-CBs:
   1. Disconnect the Ethernet cable plugged into the port labeled LCC0 on TX-CIP-0.
   2. Disconnect the other end of the Ethernet cable plugged into the port labeled CIP on T-CB-0.
   3. Disconnect the Ethernet cable plugged into the port labeled LCC0 on TX-CIP-1.
   4. Disconnect the other end of the Ethernet cable plugged into the port labeled CIP on T-CB-1.
8. Remove the fiber-optic array cable connector from each T640-SIB adapter. Partially loosen the thumbscrew and captive screw on the fiber-optic array cable connector. (Use the supplied small slotted screwdriver to loosen the captive screw.) Alternate between the thumbscrew and captive screw until the cable connector is removed from the adapter.
9. Remove the dust covers from the dust-free resealable plastic bag and reinstall them on the fiber-optic array cable connectors. Align the dust cover with the cable connector and carefully press them together until they stop. The cover and the cable connector are keyed to ensure proper mating. Secure the dust cover by tightening the thumbscrew and captive screw on the connector. (Use the supplied small slotted screwdriver to tighten the captive screw.)
10. Dress the fiber-optic array cables so that they are not touching or blocking access to T640 router components, and that they do not drape where people could trip on them.
11. Replace each T640-SIB with a SIB. Use the standard replacement procedure described in the T640 Core Router Hardware Guide .

    Do not bring any of the SIBs online.

    Note: Ensure that the ejector handle tabs are properly mated inside their corresponding chassis slots before you tighten the captive screws on the ejector handles. You might have to close and open the handles a few times before the tabs catch the slots.

12. Set the M/S switch on each T-CB faceplate to S.
13. Set the CHASSIS ID switch on each T-CB faceplate to 0.
14. On an external management device connected to the console or auxiliary port of the T640-CIP, load the original T640 router configuration. For example:
    user@host# load override t640-config.conf
15. If graceful switchover is enabled in the original T640 router configuration, disable it as follows:
    user@host# delete chassis redundancy graceful-switchover
16. Issue the commit synchronize command and ensure that there are no synchronization errors:
    user@host# commit synchronize
17. On an external management device connected to the console or auxiliary port of T640-CIP-0, reboot the corresponding Routing Engine in the T640 router:
    user@host> request system reboot
18. On an external management device connected to the console or auxiliary port of T640-CIP-1, reboot the corresponding Routing Engine in the T640 router:
    user@host> request system reboot
19. Display the status of the SIBs by issuing the show chassis sibs command on the master Routing Engine:
    user@host> show chassis sibs

    Slot  State               Uptime
     0    Spare            255 days, 31 minutes, 12 seconds
     1    Online           255 days, 31 minutes, 12 seconds
     2    Online           255 days, 31 minutes, 12 seconds
     3    Online           255 days, 31 minutes, 12 seconds
     4    Online           255 days, 31 minutes, 12 seconds

    Verify that four SIBs are in the Online state and one SIB is in the Spare state.

20. Delete all statements associated with LCC0 from the TX Matrix router configuration. To review the T640 router configuration changes that were merged into the TX Matrix router configuration, see Creating a Configuration File on the T640 Router for Integration into the Routing Matrix.

Note: You do not need to replace the rear fan tray with the original one.