Networklearner

I am a network professional with over 18 years of experience in enterprise and data‑center networking. I am a CCIE Data Center certified engineer with strong hands‑on expertise in Cisco Nexus and Cisco ACI design, deployment, troubleshooting, and operations. I work on production ACI fabrics and am available for Cisco ACI and Nexus freelancing or consulting work. Contact: rockingoa@gmail.com

Sunday, 31 August 2025

Cisco ACI Port Security

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   Cisco ACI Port Security – Summary Purpose : Controls the number of MAC addresses that can be learned on an interface to prevent unauth...
Saturday, 30 August 2025

Cisco ACI - Fabric Secure Mode Overview

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  Fabric Secure Mode Overview Fabric Secure Mode is a security feature in Cisco ACI that safeguards the infrastructure from unauthorized a...

Cisco ACI - Node Stateful Vs Stateless reload

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  Aspect Stateful Reload Stateless Reload Definition Reload where process sta...
Thursday, 28 August 2025

ACI Node state - undiscovered Vs Unknown

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     Undiscovered : You’ve manually added a node ID in APIC. The switch is not yet connected or powered on. Could be due to ca...
Tuesday, 26 August 2025

What is a Contract Preferred Group in ACI?

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  🔷 What is a Contract Preferred Group in ACI? In Cisco ACI,  Endpoint Groups (EPGs)  typically require  contracts  to communicate with ...

ACI Leaf Switch Replacement

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 To replace a Cisco ACI leaf switch, follow these  step-by-step instructions  to ensure a smooth transition without disrupting your fabric: ...
Sunday, 24 August 2025

Common Causes of "Unknown" Leaf State

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   Common Causes of "Unknown" Leaf State Certificate Issues : The leaf might not be presenting a valid certificate chain to the AP...
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