A wastewater plant must extend one legacy process VLAN into the SD-Access fabric for a phased migration. Which border approach fits that use case while still requiring careful flood-domain planning?
Select an answer to reveal the explanation.
Short Explanation
Think of the plant VLAN like an old wing you temporarily connect to a new building—you need a real Layer-2 doorway, not just a routed hallway. An L2 border handoff bridges that legacy VLAN into the fabric so endpoints can keep talking during migration. The catch is you also dragged the flood domain along, so keep that broadcast blast radius on a short leash.
Full Explanation
Cisco SD-Access Layer-2 border handoff extends a traditional VLAN/broadcast domain into the fabric overlay for migrations and appliances that still require L2 adjacency. That convenience enlarges the flood domain and can reintroduce spanning-tree and broadcast risk across the handoff. Designers should limit which VLANs are extended, monitor broadcast/multicast load, and prefer Layer-3 handoff once hosts can be re-IP’d into fabric-native subnets.