"4. The designated forwarder makes copies of the BUM frame and sends it to the remote sites. The destination IP address used when VXLAN encapsulating the packet is the special IP address (O-MTEP) identifying each remote site and is used specifically for the transmission of BUM traffic across sites. The O-MTEP is another anycast IP address defined on all the remote spine nodes that are connected to the intersite network (each site uses a unique O-MTEP address). The source IP address for the VXLAN-encapsulated packet is instead the anycast O-UTEP address deployed on all the local spine nodes connected to the intersite network."
A Overlay Multicast TEP: This common anycast address is shared by all the spine nodes in the same site and is used to perform head-end replication for BUM traffic.
A is the correct Answer.
Overlay Multicast TEP: This common anycast address is shared by all the spine nodes in the same site and is used to perform head-end replication for BUM traffic.
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739609.html
Answer is B
https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-multi-site-deployment-guide-for-aci-fabrics.html#:~:text=An%20Overlay%20Multicast%20TEP%20(O,originated%20from%20the%20remote%20sites.
from: https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739609.html
"Overlay Multicast TEP (O-MTEP): This common anycast address is shared by all the spine nodes in the same site and is used to perform head-end replication for BUM traffic. BUM traffic is sourced from the O-UTEP address defined on the local spine nodes and destined for the O-MTEP of remote sites to which the given bridge domain is being stretched."
So the O-MTEP performs the head-end replication but the source is actually the O-UTEP
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