: Ensure your Cisco Connection Online (CCO) ID is associated with a valid Service Contract . Without an active contract for your serial number, the download link may be grayed out or restricted.
It started with a subtle jitter. A few dropped packets here, a malformed TCP header there. Then, three nights ago, the router crashed during a routine BGP table refresh. When it rebooted, the console vomited a cascade of hex errors:
Router# show version | include IOS Router# show flash:
Cisco IOS 15.7(3) was released in 2016. The base version (M1) contained hundreds of caveats. By M9, Cisco had resolved: