Upgrading to a T640 Standard SIB Version B

Note: Before you install one or more FPC4s in a T640 router that is not part of a routing matrix, you must replace each SIB in the router with a SIB version B. SIB version B is supported in Junos OS Release 7.3 and later.

Standard SIBs and SIB version B cannot be installed in the same chassis at the same time, except during upgrade. To upgrade to standard SIB version B, you prepare the router by placing it into upgrade mode, then replace each standard SIB with a standard SIB version B.

Note: During the upgrade, the T640 router might experience some packet loss, depending on the operational environment. For more information, contact your customer support representative.

To upgrade for each of the SIBs in the T640 router:

1. Preparing to Upgrade to a T640 Standard SIB Version B
2. Replacing T640 Standard SIBs with Standard SIB Version B

Preparing to Upgrade to a T640 Standard SIB Version B

To prepare to upgrade from standard SIBs to standard SIB version B:

1. Verify that you are running Junos OS Release 7.3 or later.
2. Include the fabric upgrade-mode statement in the configuration at the [edit chassis] hierarchy level.
   user@host# set chassis fabric upgrade-mode

3. Commit the configuration on both the master and the backup Routing Engines.
   user@host# commit synchronize

4. Display the status of the T640 router SIBs by issuing the show chassis sibs command:
   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. If five SIBs are installed, verify that one SIB is in the Spare state. To bring a SIB online, issue the request chassis sib online operational mode command.

Replacing T640 Standard SIBs with Standard SIB Version B

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. Select one of the SIBs to replace, and take it offline by using one of the following methods:
   • Press and hold the ONLINE/OFFLINE button on the SIB faceplate for about five seconds until the OK LED is not lit.
   • Issue the request chassis sib offline command. For example:
     user@host> request chassis sib offline slot 0

   Note: When you bring an active SIB offline, the spare SIB becomes active and transitions to the Online state.

3. Replace the SIB with a standard SIB version B. Use the replacement procedures described in Removing a T640 Standard SIB or Standard SIB Version B and Installing a T640 Standard SIB or Standard SIB Version B

   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.