It is not possible to set a higher mtu value of 1504 on the sfp1 port in combination with a S+RJ10 and a CCR1036 8G 2S+
Two CCR directly connected with a ethernet cable (3 meter) on a SFP1 port with module S+RJ10 can not go higher than 1504 mtu value
MTU Values greater than 1504 dont work