Hello Chris
Thanks for catching that, that’s great. Looking further into the issue, it is the case that UDP port 4342 is used by LISP, while 4343 is used by something called Unicall. I wasn’t able to find more information about Unitcall, however, there is extensive Cisco documentation that mentions that EIGRP OTP uses port 4343 and not 4342 for LISP. Extensive decodes and captures of exchange packets repeatedly indicate the use of 4343 in this related Cisco documentation concerning OTP architecture. (search for 4343). Additionally, unicall is mentioned as the use of 4343 in this documentation while also being indicated as the port for LISP. It seems these ports are somewhat related. Let’s see if @ReneMolenaar can shed any more light on it.
I hope this was helpful!
Laz