300-620 · Question #236
Refer to the exhibit. An engineer is migrating legacy servers into the Cisco ACI environment. The requirement is to ensure that all endpoints and MAC addresses are learned properly in legacy and…
The correct answer is B. L2 Unknown Unicast: Flood. To ensure proper endpoint and MAC address learning across both legacy and Cisco ACI switches during a migration, the L2 Unknown Unicast policy for the bridge domain must be set to Flood.
Question
Refer to the exhibit. An engineer is migrating legacy servers into the Cisco ACI environment. The requirement is to ensure that all endpoints and MAC addresses are learned properly in legacy and Cisco ACI switches. Which configuration set must be configured under the bridge domain called bd_360 to accomplish this goal?
Exhibit
Options
- AL2 Unknown Unicast: Hardware Proxy
- BL2 Unknown Unicast: Flood
- CL2 Unknown Unicast: Hardware Proxy
- DL2 Unknown Unicast: Flood
How the community answered
(45 responses)- A2% (1)
- B82% (37)
- C11% (5)
- D4% (2)
Why each option
To ensure proper endpoint and MAC address learning across both legacy and Cisco ACI switches during a migration, the L2 Unknown Unicast policy for the bridge domain must be set to Flood.
Setting 'L2 Unknown Unicast' to 'Hardware Proxy' means that unknown unicast traffic is sent to the spine proxy, which then resolves the destination, but this can prevent legacy switches from learning MAC addresses properly during migration.
When integrating legacy switches and migrating servers into Cisco ACI, setting the 'L2 Unknown Unicast' policy to 'Flood' in the bridge domain is crucial. This ensures that unknown unicast frames are flooded out all bridge domain member ports, allowing legacy switches to learn MAC addresses and for the ACI fabric to learn MACs from legacy domains, facilitating smooth coexistence and proper endpoint learning in a mixed environment.
Setting 'L2 Unknown Unicast' to 'Hardware Proxy' means that unknown unicast traffic is sent to the spine proxy, which then resolves the destination, but this can prevent legacy switches from learning MAC addresses properly during migration.
This is a duplicate of the correct answer B and does not provide an alternative incorrect choice.
Concept tested: ACI Bridge Domain L2 Unknown Unicast policy
Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/6x/config/l2/cisco-aci-layer2-networking-configuration-guide-60x/m-l2-unicast-forwarding.html
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