What are the ACI L2 connectivity options?

(1) Extend the application EPG out. (2) Extend the BD out (L2Out).

Cisco ACI L2 Connectivity Guide: EPG Out vs. BD Out (L2Out)

When extending the ACI L2 connectivity outside the Cisco ACI fabric, it’s essential to understand the differences between L2Out via Bridge Domain (BD) and EPG-based external connectivity (EPG Out).
This blog breaks down the technical details, ideal use cases, and configuration tips to help you deploy the right solution in your Cisco ACI environment.

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Summary

Cisco ACI L2 external network connectivity options: (1) Extend the application EPG out. (2) Extend the BD out.
When using the EPG out method, STP TCNs from the external Layer-2 switch may impact the ACI internal EPs in the same VLAN.
When using the BD out (L2Out) method, STP TCNs from the external Layer-2 switch do not impact the ACI internal EPs.
Cisco APIC Layer 2 Networking Configuration Guide.

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