Juniper PTX5000, Hardware Manual, Page: 566 / 721

state indicates that the link between the SIB and FPC has CRC errors. However, the link is still
eligible to carry traffic.
• show chassis fabric sibs —Check the switch fabric links between the SIBs and FPCs. The value of
the Fabric management SIB state field in the command output should be Links ok . The Link error state
indicates that the link between the SIB and the FPC is not operational.
TIP: If there are errors, the show chassis fabric topology command shows more details about
the current fabric plane and link state. See "Troubleshooting the PTX5000 Switch Interface
Boards" on page 616 for more information.
3. Reset the interface statistics by using the
clear interfaces statistics all
command so that you can
easily determine whether any traffic drops are occurring during the procedure. Use the
show
interfaces statistics
command to determine whether there are any errors.
4. Include the fabric upgrade-mode default statement in the configuration of the PTX5000 at the [edit
chassis] hierarchy level.
[edit]
user@host# set chassis fabric upgrade-mode default
5. Commit the configuration on both the primary and the backup Routing Engines.
[edit]
user@host# commit synchronize
6. Use the show configuration chassis operational-mode command to verify that upgrade mode is set.
7. Place an electrostatic bag or antistatic mat on a flat, stable surface.
8. To prevent damage to the equipment caused by static discharge, attach an ESD grounding strap to
your bare wrist, and connect the strap to one of the ESD points on the chassis.
9. Take one of the old SIBs offline by using the request chassis sib offline slot
slot-number
command.
Leave the remaining SIBs online.
10. Remove the offline SIB:
a. Twist the ejector handles counterclockwise to unseat the SIB.
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