After a first Map-Register goes through the fast path, subsequent Map-Registers show this warning:

2017-02-17 19:13:01,350 | WARN | pool-16-thread-1 | MappingSystem | 293 - org.opendaylight.lispflowmapping.mappingservice.implementation - 1.5.0.SNAPSHOT | Could not update timestamp for EID 192.0.2.0/24 xTR-ID E073DF027BF20605DC9B9518BA753345, no mapping found

This needs investigation. A regression in Carbon, it doesn't happen in Boron.