Hi, thanks you for your quick responds Paul_L but we are running since some weeks on both MXs FW 17.8. We have upgraded since march some firmware in the hope we can fix the problem but the trouble still exist.   regards Stefan ... View more

Hi, same here since end of march (Case open 28.03.2022). Update from 17.3 to 17.5 and more. If the hot spare is available the traffic is poor and ping getting lost. shutting down on of the MX network ports all run fine. We have two redundant datacenters connected as metro datacenter in the city. Meraki support and we have done a lot of scans and traffic analyze. Meraki say it´s a problem of the Juniper switches. So after a lot of work we have moved the mx to one location and connected to the same Cisco switch. Result is the same if both MX are up and running the traffic is bad and pings get lost. The cisco switch that hold both MXs you can see the flapping of the both MXs NICs every 10-20 sec.   002207: Jul  5 07:41:20.351 MEST: %SW_MATM-4-MACFLAP_NOTIF: Host cc03.d907.a4d5 in vlan XXX is flapping between port Gi0/36 and port Gi0/41   Now is no Juniper between the devices all MXs are connected to the same switch and the problem still exist. We are thinking again that the problem is on the MX Firmware ... Any (other) ideas?   regards Stefan ... View more