Replacing the SSB

Purpose

The SSB is hot-pluggable. When the SSB is removed, all packet forwarding stops immediately and the Routing Engine responds by sending alarms through the Ethernet channel to the management console. When the SSB is replaced, it is rebooted by flash EEPROM.

Action

To replace a failed SSB, follow these steps:

1. Attach an ESD wrist strap to your bare wrist, and connect the wrist strap to one of the two ESD points on the chassis.
2. Locate the SSB offline switch on the front panel and press and hold the switch for 5 seconds to take the SSB offline.
   

   CAUTION: If you take the SSB offline, packet forwarding will be affected.

   
   
3. Unscrew the thumbscrews on the left and right sides of the card carrier to unseat the SSB from the midplane.
4. Flip the ends of the two extractor clips, which are adjacent to the thumbscrews, towards the outside edges of the router.
5. Grasp both sides of the card carrier and slide the SSB about three-quarters of the way out of the router.
6. Move one of your hands underneath the SSB to support it, and slide it completely out of the chassis.
7. Replace the SSB with one that you know works.
8. Grasp the front of the SSB card carrier with both hands and align the back of the card carrier with the slide guides on the chassis.
9. Slide the SSB card carrier all the way into the card cage until it contacts the midplane.
10. Flip the extractor clips, located on the left and right sides of the card carrier, towards each other to secure the SSB in place.
11. Tighten the thumbscrews on the left and right sides of the card carrier to seat the SSB.
    

    NOTE: To seat the SSB properly, be sure to tighten the screws adequately. If the SSB is not seated properly, it will not function.

    
    
12. Verify that the SSB works by using the show chassis ssb CLI command. (See Display the Redundant SSB Detailed Status.)