Cisco ACI – Flood in Encapsulation

🧠 What Is “Flood in Encapsulation”?

Flood in
encapsulation is a setting in Cisco ACI that controls how broadcast or
unknown traffic is handled within a bridge domain when multiple EPGs
use different VLANs.

📦 Example Scenario

Let’s say:

• EPG1 uses VLAN X
• EPG2 uses VLAN Y
• Both EPGs are part of the same bridge
  domain

If flood in
encapsulation is enabled, then:

• Broadcast or unknown traffic from EPG1
  will only flood within VLAN X
• It won’t reach EPG2 (VLAN Y),
  even though they share the same bridge domain

✅ Why Use It?

This helps limit
unnecessary traffic between EPGs and improves security and
performance by keeping flooding local to each VLAN.