3.10.4 Precautions when using priority determination

(1) Frame priority determination

If an operation that raises the priority of the frame is specified, communication might be disabled because protocol control frames sent to the Switch cannot be received, or frames originated by the Switch cannot be sent. In particular, IP multicast packets are packets sent to the Switch and also are frames to be relayed. Therefore, be careful when raising the priority of the frames. If such a problem occurs, perform the following:

• When the stack is configured, if communication with protocol control frames sent to the Switch is disconnected, lower the priority of the frames.

• If communication of the protocol control frame addressed to the Switch is disconnected in a standalone configuration, set the priority determination operation change.

• If communication with frames originated by the Switch is disconnected, lower the priority of the frames.