You are a senior network administrator managing your company's data center.
Upon receiving complaints from server team that yesterday there were multiple short network cuts that impacted some very sensitive applications running in the data center, you investigate and find out that one of the level 1 network engineers performed the following changes on these 4 switches:
- he created a new vlan 200 on all 4 switches
- he added vlan 200 to instance 2 on all switches in this order: Acc-1 -> Acc-2 -> Dist-1 -> Dist-2
Note: the trunks between the switches allow all vlans!
Considering the actions performed by the junior engineer,
1. how can you explain the network cuts ?
2. how could have he performed the task (to assign new vlan 200 to instance 2) without any network cut ?
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Costi is a network and security engineer with over 10 years of experience in multi-vendor environments. He holds a CCIE Routing and Switching certification and is currently pursuing same expert-level certifications in other areas. He believes that the best way to learn and understand networking topics is to challenge yourself to fix different problems, production-wise or lab-type exams. He also enjoys teaching networking and security technologies, whevever there is an opportunity for it.
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