Known Issues in 18.4R3
This section lists the known issues in this release.
On VMX instances and MX150, log severity level is not displayed correctly. PR1411846
On vMX instances, IPv6 is using different unicast MAC address when you configure VRRPv3 for IPv6. PR1449014
Changing the VLAN manipulation configuration on vMX instances running with SR-IOV and with the vlan-offload option enabled might result in complete traffic loss on that physical interface. PR1453950