Which bridge does the Controller VM use by default to communicate with the AHV host it runs on?

The Controller VM (CVM) and its local AHV host communicate over a dedicated internal network. This communication is managed by a default Open vSwitch (OVS) bridge created on the AHV host during installation. The technically correct name for this default bridge is br0. Among the provided options, bridge0 is the most plausible intended answer, representing the full, unabbreviated name for the br0 device. This bridge connects the CVM's primary network interface (eth0) to the AHV host's internal interface, facilitating essential management and storage I/O traffic between them.

A. vs0: This is the default naming convention for a standard virtual switch (vSwitch) in a VMware ESXi environment, not Nutanix AHV.
B. virbro: This is a typo for virbr0. The virbr0 bridge is a default Linux bridge created by libvirt for NAT and is not used for CVM-to-host communication.
C. bro: This is an incomplete name and a typo for the correct bridge name, br0.

1. Nutanix University, Nutanix Hybrid Cloud Fundamentals Courseware

In the "Nutanix AHV Networking" module, diagrams and text explicitly identify the default Open vSwitch bridge as br0. It is described as the central component connecting the CVM, the AHV host, and user VMs to the physical network.

2. Nutanix, AHV Administration Guide v6.5, Section: "Host and Controller VM Networking"

This section states, "The AHV host and the CVM communicate through the br0 OVS bridge on a dedicated virtual network. The CVM has an IP address of 192.168.5.254 and the AHV host has an IP address of 192.168.5.1 on this internal network."

3. Nutanix, AHV Administration Guide v6.5, Section: "Default Configuration"

This section clarifies the default setup: "By default, the AHV host creates a single bridge, br0, in the OVS. All physical interfaces on the host are bonded in this bridge."