Hello, For solutioning my problem, I did make a loop WAN/LAN. How to work : - I put on two ports the same VLAN (level 3, create on my MX). - Enter my WAN cable (to my router) on one of this port and exit with cable on this other port to port WAN MX Don't spanning-tree or BPDU error because this loop is WAN-LAN's loop This solution of my work make good job and work since one month without problem Thank you for your help !
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