No, you can't disable the LonTalk/IP traffic on the IzoT Router. The LonTalk/IP channel is fixed to port 2541. That is, you can't change the LonTalk/IP port.
The LonTalk/IP channel in the IzoT Router is used for the IzoT Router IP backbone.
This LonTalk/IP channel is also used to discover the IzoT Router IP address KB1051 when using Dynamic IP Addresses (DHCP).