Please be advised of the following maintenance window:
Maintenance Window: Thursday October 1st, 2020 - 11:00pm - Friday October 2nd, 2020 - 1:00am Eastern time
Affected Device(s): core03.tor2
Affected Customers: Customers who are directly connected to the affected devices above.
Service Impacting: Yes - Customers physically connected to the affected devices above will see services impacted during this maintenance window. This maintenance activity is not expected to significantly impact customers whose equipment is not directly connected.
Details: Before the maintenance work commences, we will be steering all non-local traffic away from the devices in question, by gracefully shutting down BGP sessions, and adjusting metrics to push bits over other links during the maintenance period, to ensure impact is as limited as possible. We do not expect customers in the Tor1 facility to see any discernible impact from this maintenance period.
We will be replacing the memory in core03.tor2's current supervisor card, and adding a second supervisor card to act in an active/standby (SSO/Stateful Switch-Over) configuration as was done with core04.tor2 at the end of August-2020. During this operation, the router's OS will be reloaded/rebooted in order to enable the Cisco NSF (Non-Stop Forwarding), and NSR (Non-Stop Routing) feature sets, which should allow the router to fail-over between its active/standby supervisors without dropping BGP sessions/links/etc.
After the configuration changes have been applied, we intend to simulate the active supervisor card failing to ensure the configuration applied is working properly.
While the maintenance window in question is 2 hours long to allow staff time to stage/prep/test/etc., we estimate the actual service impact will be somewhere between 10 and 20 minutes total over the course of 1-3 short interruptions.
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