dlep_router wiki page states that the default value for discovery_port is 22222

[jpo-github-work]

Looking at the source, this actually seems to be DLEP_WELL_KNOWN_MULTICAST_PORT_TXT which is 854. This also matches the RFC and the IANA registry.

/*! UDP port for DLEP multicast discovery */
#define DLEP_WELL_KNOWN_MULTICAST_PORT_TXT "854"

This is the offending section: dlep_router
discovery_port | 22222 | integer | 1-65535, no fractions