Exam 400-007 topic 1 question 187 discussion

Based on the provided answers I would almost go with C. The legacy network is already migrated and I assume this includes all applications. In this case it would make sense to prune the vlan from the L2 migration link to get rid of STP TCN ... . Which still could get send due to flappigng trunk port or wrong configured access ports in legacy. Looking for other opinions. -

ans is C as per https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

No mentions the endpoints network needs to be advertised/routed. But if that is the case, pruning the VLAN from the L2 interconnect will isolate the endpoints from the rest of the network. Prudent to just go with an answer covering our question's requirements.

Network is migrated already. A, B and D (if it did make sense) already happened. So, C. Ref:https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html "Decommission Layer 2 Interconnect Although the Layer 3 external connectivity or interconnect might remain necessary for the lifecycle of the remaining resources in the brownfield network, the Layer 2 interconnect for the first-hop gateway can be decommissioned once the workload migration is complete. It is a good practice not to have any Layer 2 interconnects if they are not required, to avoid any possibility of Layer 2 loops (Figure 31)."

After all hosts are migrated to fabric, you must prune the VLAN away for fault isolation purposes.

C. The migrated VLAN should be pruned from the Layer 2 interconnects.

https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

Decommission Layer 2 Interconnect Although the Layer 3 external connectivity or interconnect might remain necessary for the lifecycle of the remaining resources in the brownfield network, the Layer 2 interconnect for the first-hop gateway can be decommissioned once the workload migration is complete. It is a good practice not to have any Layer 2 interconnects if they are not required, to avoid any possibility of Layer 2 loops https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

B. his VNID provides a unique identifier for the network within the VXLAN overlay, which allows the network to be identified and properly routed within the new network. This is a key step in enabling host migration at Layer 2.

based on https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

legacy ntw is not migrated

B should be completed before D can take place