Resolution
If the router displays the system bootstrap version and hangs or falls into a booting loop, repeating the same information, the memory may not be well-seated. To address this issue, perform these steps:
- Re-seat by removing and then re-inserting the DRAM SIMM memory. A faulty or poorly-seated module can cause the router to enter a boot loop.
- Physically remove all network modules and power on the router.
- If the router goes back into a loop, replace the router chassis.
- If the router does not go back into a loop, add a network module, and boot the router. If the router loads without errors, repeat until all of the modules have been tested.
- If one of the modules causes the router to go back into a loop, try the module in another slot. This narrows the issue to either the card or the slot.
- Replace the faulty hardware.
Note: If the router does not experience the continuous loop after following the troubleshooting steps, then the problem may be caused by a mis-seated network module. Monitor the router for 24 hours to make sure that the router continues to function without experiencing the issue again.
When hardware replacement is indicated after troubleshooting:
- If you have a hardware support contract directly with Cisco for this part, use the Service Order Submit Tool to request a replacement part directly.
- For warranty service, contact the Cisco Technical Assistance Center (TAC) directly at 1-800-553-2447, or online by using the TAC Service Request Tool.
- If your product is not covered by contract or warranty, contact your Cisco partner or reseller to request a replacement part for the hardware component that is causing the issue.
