CTC Union FTH4-1000MS, User Manual

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3.5.7 Management VLAN Setting
This function is independent of any other VLAN group or per port settings. The settings here provide a very quick method to configure how
access to management is controlled.
There are three control 'states' defined as follows:
Disable
: This means that the "access control" is not enabled. When set to disable, management is allowed in the respective port. By default,
both the TP and FX ports allow full management using untagged packets.
Enable
: The access control for the effected port is now enabled. Only packets tagged with the assigned "Management VID" are allowed for
management of the Gigabit & Fast Ethernet media converter.
Drop
: No management is allowed from this port connection. If, for example, the TP port is set for 'Drop', then there will be no way to manage
this device when connected to the UTP port. The management is effectively blocked on that port. This dropped setting might be used in an
application where only management arriving from the FX port is desired and all management from TP is blocked.
Caution
: The "Apply" button is immediate and persistent. An incorrect setting here could result in 'loss of management' when applying that
setting. For example, if you are managing the device via the UTP connection, select 'Drop' for the UTP port and then click 'Apply',
management will be immediately lost. In fact, the device will no longer reply to 'ping' at its IP address. Simply rebooting the device will not be
enough to recover. To regain management control, either access management from the fiber side, or reset the device to factory default and
start over again.