User manual

Virtual Local Area Network (VLAN)
6874_en_09 PHOENIX CONTACT 7-3
Tagging In "Tagging" mode, incoming packets are received according to the specified VLAN rules,
a VLAN tag is added, if required, and the packet is then processed by the switch and the
management level according to the information in the tag. When transmitting Ethernet
packets, the switch observes the rules for the relevant VLAN or the relevant output port.
Figure 7-1 "General VLAN Configuration" menu
GVRP protocol The GVRP protocol (GARP VLAN Registration Protocol) can be activated in "VLAN
Tagging" mode for dynamic registration of the VLANs at the relevant neighbor. The GVRP
switch indicates the selected user setting or enables the setting.
GVRP is used to dynamically create VLANs across several switches. If GVRP is set to
"Disable", the switch is transparent for GVRP BPDUs (GVRP data packets).
If GVRP is active, the switch sends GVRP BPDUs every ten seconds. If the VLAN
assignment of a port to a specified VLAN is changed, the adjacent switches will be
informed of this change within the next 10 seconds.
When the GVRP is disabled, the adjacent switches also remove the dynamically learned
ports within the next 10 seconds. If GVRP packets are missing, the learned group
assignments are rejected after approximately 20 seconds.
If a static VLAN is installed on a switch, a port can be added to this VLAN via GVRP. The
port is listed in the Current VLANs Table. However, only statically created group members
are saved.
The management VLAN ID specifies in which VLAN the switch can be accessed if it is
operating in "Tagging" VLAN mode.
The switch supports a maximum of 32 different VLANs.
After switching the VLAN mode from "Tagging" to "Transparent" or vice versa, the active
configuration must be saved and a device reset triggered so that the modification
becomes active. The current valid state can be read in the "Current Tagging Status" line.