正解:B
The issue described involves intermittent traffic loss when Leaf102 rejoins the vPC during an upgrade. This happens because SVIs (interface VLANs) can come up before the vPC peer-link is fully established, leading to black-holing of traffic.
The correct solution is to delay the restoration of SVIs until the vPC peer-link is stable. The command delay restore interface-vlan <VLAN-ID>ensures the SVI (e.g., VLAN 180) remains down during the peer reconvergence period, preventing premature routing or switching decisions that cause traffic drops.
dual-active exclude interface-vlan is used in dual-active detection but doesn't solve restore delay.
delay restore orphan-portapplies to orphan ports, not SVIs.
auto-recovery reload-delayis for recovery after a reload without peer-link, unrelated to SVI restore timing.