Symptoms
Users attempting to browse to www.practice-labs.com will have encountered a HTTP 503 error, rendering the Practice Labs platform inaccessible.
What Went Wrong
A planned network change implemented during the maintenance window caused an outage that extended beyond the scheduled timeframe.
Who Was Impacted
All users attempting to access or use the Practice Labs platform were affected by the outage.
Why It Went Wrong
The intended modification aimed to facilitate the border switch ahead of a web layer migration. However, a spanning tree configuration on a non-Cisco device disrupted the priority on the core switch for the carrier VLAN, resulting in the outage. Upon reverting the change, we designated the core switch as the root bridge, resolving the issue successfully.
How We Fixed It
We promptly rolled back the intended network change, restoring normal functionality to the Practice Labs platform as the time exceeded the maintenance window.
