Firmware update for MES23xx-xx, MES3300-xx, MES3500I-08P, MES3500I-10P, MES3500I-8P8F, MES3500I-24F, MES5312, MES5316A, MES5324A, MES5332A, MES5300-24, MES5300-48, MES5305-48, MES5310-48, MES5320-24. Version 6.6.13.4

17 September 2026

Firmware update

Firmware version: 6.6.13.4

The firmware and detailed description of the product capabilities are available in the Downloads or on the product page.

Added

  • Added the ability to specify the as-range for remote-as dynamic BGP neighbors;
  • Added support for the PRP protocol (IEC 62439-3) for MES3510S-XX devices;
  • Added support for the PTP protocol (IEEE 1588v2) in Transparent Clock mode for MES3510S-XX devices;
  • Added the ability to create a static ARP record with a multicast MAC address;
  • Added the ability to assign a Native VLAN to Dot1x if an Access-Reject message is received from the RADIUS server;
  • Added the ability to assign a Native VLAN in Dot1x if the RADIUS server is unavailable;
  • Added the ability to track the availability of RADIUS servers;
  • Added support for option 79 in IPv6 DHCP Relay;
  • Added the ability to add the DHCP option 82 on the interface;
  • Added the ability to customize Option 82 templates for PPPoE IA;
  • Added support for the sFlow flow-sample function for outgoing traffic;
  • Added the ability to configure the loopback detection mode;
  • Added support for the local proxy ARP function;
  • Added collection of DHCP Snooping statistics;
  • Added the LLDP neighbor output command for all interfaces at once;
  • Added the ability to check the availability of the switch's IP address via VXLAN tunnels;
  • Added the ability to change the Don't Fragment bit in the external VXLAN header;
  • Increased the maximum number of OSPF neighbors to 256;
  • Added the ability to control the announcement of an aggregated route when receiving a prefix included in it;
  • Added support for the Persistent hash function for ECMP;
  • Added support for Explicit Congestion Notification function;
  • Added support for Enhanced Transmission Selection function;
  • Added automatic learning of the MAC address of a VPC neighbor via a peer-link;
  • Added support for the Micro-BFD function;
  • Added a new CPU Rate Limit tcp-other for all TCP packets except SSH, TELNET, HTTP/HTTPS.

Fixed

  • The error of switching the STP Alternate interface to the Listening and Learning state has been fixed;
  • Fixed an error when disabling routing;
  • Fixed a MAC table synchronization error that caused the VPC domain to malfunction;
  • Fixed an error that caused devices in the stack to freeze and reboot if there was no license on one of them;
  • Fixed the error of summation of interzonal routes in OSPF;
  • Incorrect tag transmission in the PPPoE session has been fixed;
  • Fixed an error that caused the switch to reboot when connecting multiple phones at the same time;
  • Fixed an error that caused the switch to reboot when deleting the ACL setting from the vlan interface;
  • Fixed sending a false SNMP trap about configuration changes;
  • Fixed an error copying the configuration to the switch when configuring the NTP server in the VRF;
  • Fixed an error in copying the configuration to candidate-config using the SFTP protocol;
  • Fixed an error that did not allow assigning a non-default VRF control from the 192.168.1.X network to the OOB address;
  • Fixed incorrect display of configuration of metric and distance parameters for static routes in VRF;
  • Fixed an error that caused the device to reboot when loading the startup configuration containing the PIM or IGMP settings on a VLAN interface that was missing from the VLAN Database;
  • Fixed an error that caused the Transfer distance to be displayed incorrectly in the DDM output;
  • Fixed the error of inverting the switchport forbidden default-vlan setting in the web interface;
  • Fixed an error where Green Ethernet settings were not applied;
  • Fixed an error where the private-vlan isolated settings were deleted after the device was rebooted;
  • Fixed an error that caused the switch to reboot when changing VXLAN nexthop;
  • Fixed an error that caused the switch to reboot while simultaneously viewing and configuring the device configuration;
  • Fixed an error displaying AF for BGP neighbors in the show ip bgp all all neighbors command;
  • Fixed an error of intercepting reject-route traffic on the CPU;
  • Fixed the error of displaying information on SNMP when polling ifOutDiscards;
  • Fixed an error that caused the new wizard to hang on the stack after transferring control;
  • Fixed an error that caused the switch to reboot when applying an ACL on the physical interface;
  • Fixed an error that caused BFD packets to continue being sent after connectivity was lost;
  • Fixed an error that causes the device to reboot when the interface is added to the port channel multiple times;
  • Fixed a system timer processing error that caused the device to reboot.

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