When the VCN works in VMU mode, it provides the following functions:
- The VMU, functioning as the master server, connects to upper- and lower-level domains or external domains to construct a multi-level and multi-domain network. As for domain A and domain B shown in the preceding networking diagram, the master server must be VMU.
- The VMU manages MPUs and performs service configuration and control in the local domain.
- The VMU forwards media streams from external domains.
