On Monday, November 30th, there will be an emergency maintenance performed on the core router providing connectivity to a major portion of the network –
Cisco Systems have identified a service impacting bug in the current IOS version running on this router. A vendor recommended upgrade has been provided as a resolution and needs to be implemented immediately.
Original Issue Reference:
With the introduction of 4-byte ASNs (Autonomous System Numbers), a newly devised method of injecting a specifically crafted prefix into the global route table allows for the BGP process to be reset on older IOS code.
During this maintenance, customers will notice a complete loss of connectivity between 10:30 PM PST and 11:30 PM PST (Monday, November 30th). While the upgrade duration is scheduled for 1 hour, we only expect between 15-20 minutes of downtime as the routers reload and fully converge.
If you have any questions or concerns in regards to the above, please let us know and we will be more than happy to address them.
We do appreciate your patience and welcome any feedback.