Which queue should be assigned for control-plane and BFD traffic to ensure convergence on a WAN Edge router?

Cisco SD-WAN routers prioritize control-plane and BFD traffic to ensure network stability and fast convergence. By default, queue 0 is designated for this critical traffic, receiving the highest priority and guaranteed bandwidth. This ensures that routing updates, BFD hellos, and other essential control messages are processed quickly, even under network congestion. Assigning this traffic to other queues (1, 2, or 7) would subject it to lower priority or different scheduling policies, potentially delaying convergence and impacting network performance. While other queues are used for data plane traffic with varying priorities, queue 0 is specifically reserved for the most time-sensitive control traffic.