CCM                                                  NCM
 |                                                    |
 |------- MX Discover Message ----------------------->|
 |                                         +-----------------+
 |                                         | Learn CCM       |
 |                                         | IP address      |
 |                                         | and port        |
 |                                         +-----------------+
 |                                                    |
 |<----------------------------- MX System Info ------|
 |                                                    |
 |------------------------------ MX Capability REQ -->|
 |<----- MX Capability RSP ---------------------------|
 |------------------------------ MX Capability ACK -->|
 |                                                    |
 +                                                    +