This is the diff between 18.212 and 18.211.5 : MX appliances will now more gracefully apply firewall rule configuration changes. This will resolve several instances where updating large sets of L3 or site-to-site VPN firewall rules could impact packet processing and network control traffic. Fixed an additional issue that could result in MX75, MX85, MX95, MX105, MX250, and MX450 appliances reporting an erroneous spike in network traffic usage. Fixed an issue that resulted in Z4(C) appliances failing to properly forward STP frames received on its LAN interfaces. Corrected an issue that resulted in Z4(C) appliances failing to forward ARP messages that had a VLAN tag, even when the VLAN tagging correctly matched with the Z4(C)'s port configuration. Added proactive mitigations that should prevent new or unforeseen internal packet routing issues from resulting in MX75, MX85, MX95, MX105, MX250, and MX450 appliances continuously operating at 100% device utilization.
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