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.