Cisco 350-601 - Implementing Cisco Data Center Core Technologies (350-601 DCCOR)

The correct answer is A. Enhanced LACP.

In a Cisco ACI VMware VMM domain, the policy used for host uplink connectivity depends on how the ESXi hosts connect to the ACI leaf switches. The question states that vPC must connect to the leafs and the environment uses VMware Distributed Virtual Switch (DVS) 6.6. When hosts are dual-homed to ACI leaves using vPC, Cisco ACI uses Enhanced LACP as the preferred uplink policy because it provides active-active link utilization, fast convergence, and consistent forwarding behavior across both leaf switches.

MAC pinning is typically used when LACP is not available or not desired, but it does not provide the same standards-based port-channel negotiation and is not the best match when the requirement explicitly calls for vPC connectivity. Tag collection is related to VM attribute collection for policy mapping, not uplink formation. LLDP transmit helps with discovery and visibility, but it does not establish the host-to-leaf port-channel behavior.

Because the design specifically requires vPC attachment of VMware hosts through a supported DVS, the required ACI policy is Enhanced LACP.

The correct choices are A and D. In Cisco UCS, when the requirement is to aggregate links between the Fabric Interconnects and the I/O modules, the chassis discovery policy must use Link Grouping Preference = Port Channel. Cisco documents that for UCS 2200 I/O modules, selecting Port Channel causes the IOM-connected server ports to be automatically added to a port channel, which is exactly what provides link aggregation across the four 10-GbE connections per I/O module.

The second required step is D, because Cisco also states that after changing the link grouping preference, the chassis must be reacknowledged so the links are rediscovered and formed into the fabric port channel. Cisco’s UCS Manager infrastructure policy documentation explicitly notes that links can be added or removed by changing the link group preference and reacknowledging the chassis.

Options B and C do not create FI-to-IOM aggregation, and E is unrelated because unified ports are FI ports for Ethernet/FCoE or Fibre Channel flexibility, not a chassis-side requirement for this aggregation task.