3.5.5.1.1.3 Effect of Discover over Network Load Control
Discover frames are handled differently, depending on whether the enumerator is known to the responder (that is, a session already exists in the Session Table) and the responder is acknowledged.
A Discover frame is counted toward load estimation (that is, causes r to be incremented) if it results in either of the following (described in detail in section 3.5.5.1):
A new session being created in the Pending state.
An existing session transitioning to the Complete state AND the enumeration state engine simultaneously transitioning out of the Pausing state because all the session entries in the Session Table are in the Complete state (see section 3.5.5.4).
The Txc counter for the session MUST be set to TXC. If the session is causing a transition to Pausing state (see section 3.5.5.4 for how a new session impacts the state), the load control MUST be initialized as specified in section 3.5.5.1.1.1. If this new session is not causing a transition to Pausing state, the Begun flag MUST be set, which impacts load control at the end of the current block.