300-620 · Question #353
A Cisco ACI fabric has detected EP1 with IP address 192.168.1.1 to MAC M1 on interface Eth1/1. The fabric is designed so that when EP1 is down, a new EP2 receives the same IP address with a different
The correct answer is A. ARP Flooding D. GARP Based Detection. ARP Flooding must be enabled on the Bridge Domain so that gratuitous ARPs from the replacement host actually flood through the fabric (otherwise the leafs’ default proxy behavior would swallow them). GARP-Based Detection uses those flooded gratuitous ARP frames to detect the IP/M
Question
A Cisco ACI fabric has detected EP1 with IP address 192.168.1.1 to MAC M1 on interface Eth1/1. The fabric is designed so that when EP1 is down, a new EP2 receives the same IP address with a different MAC M2 on the same interface Eth1/1. Which two features must be enabled to meet this requirement? (Choose two.)
Options
- AARP Flooding
- BL3 Unknown Multicast Optimized Flood
- CL2 Unknown Unicast Hardware Proxy
- DGARP Based Detection
- EEPG Flood in Encapsulation
How the community answered
(54 responses)- A83% (45)
- B9% (5)
- C4% (2)
- E4% (2)
Explanation
ARP Flooding must be enabled on the Bridge Domain so that gratuitous ARPs from the replacement host actually flood through the fabric (otherwise the leafs’ default proxy behavior would swallow them). GARP-Based Detection uses those flooded gratuitous ARP frames to detect the IP/MAC change and promptly clear the old endpoint entry when the new host comes up on the same port.
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