Due to an issue in VOSS 4.2.1 and later releases, the port number for an IPv6 static neighbor is saved with the wrong value in the configuration file if the port is part of an MLT or SMLT. You can view the incorrect port number by using the show running-config command.
If performing a named boot (e.g. boot config.cfg), the configuration loading fails and the switch remains in a default configuration. You can manually source the configuration file (e.g. source config.cfg) to retrieve/reapply the configuration (minus the IPv6 neighbor configuration with the invalid port value).
If you boot the switch without a specified configuration (e.g.reset -y), the primary configuration fails to load and the backup configuration file is loaded instead.
Caution
You should never configure an IPv6 static neighbor on a port belonging to an MLT or SMLT.