We help IT Professionals succeed at work.

Clock issue with Cisco ISR 4000K Series routers

totaram asked
Cisco has advised BT of an issue relating to a component manufactured by one of their suppliers that affects some Cisco Optical Networking, Routing, Security & Switching products. In some hardware units, the clock signal component degrades over time. Cisco expects product failures to increase over time, beginning after the unit has been in operation for approximately 18 months.

Can anyone advise how to spot the issue and what symptom to look for if the unit has suffered such a defect?
Watch Question

Hi totaram,

This was announced earlier this year. The symptoms are as follows:  after approximately 18 months of operation the system will stop functioning, will not boot, and is not recoverable. There are multiple porducts affected - ASA firewalls, 2900 ISR routers and more.

 If you have a Cisco account you can find more details here - https://www.cisco.com/c/en/us/support/web/clock-signal.html#~faqs. In the Ordering Information tab you can find a spreadsheet which can help you identify if your products are effaced. You will need the serial # and the model number of your device. I hope that helps.

Please let me know if you have any other questions.

Thank You


So, does Cisco change the entire unit or just a card?
I believe Cisco will replace the entire unit if it the device is covered by any active service contract or was covered by warranty prior of November 16, 2016 and any device shipped after that date is not affected by the bug.

Thank You