+=======+===============+========================================+
 | Value | Name          | Description                            |
 +=======+===============+========================================+
 | 0x01  | HELLO         | Node discovery and capability exchange |
 +-------+---------------+----------------------------------------+
 | 0x02  | HELLO_ACK     | Response to HELLO                      |
 +-------+---------------+----------------------------------------+
 | 0x10  | POLICY_PUSH   | Policy distribution from controller    |
 +-------+---------------+----------------------------------------+
 | 0x11  | POLICY_ACK    | Policy receipt acknowledgment          |
 +-------+---------------+----------------------------------------+
 | 0x20  | FLOW_REPORT   | Flow statistics report                 |
 +-------+---------------+----------------------------------------+
 | 0x21  | FLOW_SYNC     | Flow state synchronization (HA)        |
 +-------+---------------+----------------------------------------+
 | 0x30  | SLA_ALERT     | SLA violation notification             |
 +-------+---------------+----------------------------------------+
 | 0x31  | SLA_CLEAR     | SLA violation cleared                  |
 +-------+---------------+----------------------------------------+
 | 0x40  | APP_SIGNATURE | Application signature update           |
 +-------+---------------+----------------------------------------+
 | 0x0F  | ERROR         | Error notification                     |
 +-------+---------------+----------------------------------------+