Allied Telesis AT-IFS802SP/POE - Manual (Page 57)

53 AT-IFS802SP/POE(W)-80 User Manual
Pull down the selection item and focus on • 802.1Q then press to set the VLAN Operation
Mode in 802.1Q mode.
Enable GVRP Protocol • : GVRP (GARP VLAN Registration Protocol) is a protocol that
facilitates control of virtual local area networks (VLANs) within a larger network. GVRP
conforms to the IEEE 802.1Q specification, which defines a method of tagging frames with
VLAN configuration data. This allows network devices to dynamically exchange VLAN
configuration information with other devices. For example, having enabled GVRP on two
switches, they are able to automatically exchange the information of their VLAN database.
Therefore, the user doesn’t need to manually configure whether the link is trunk or hybrid,
the packets belonging to the same VLAN can communicate across switches. Tick this
checkbox to enable GVRP protocol. This checkbox is available while the VLAN Operation
Mode is in
802.1Q mode.
Management VLAN ID • : Only when the VLAN members, whose Untagged VID (PVID)
equals to the value in this column, will have the permission to access the switch. The default
value is ‘0’ that means this limit is not enabled (all members in different VLANs can access
this switch).
Select the port you want to configure.
•
Link Type • : There are 3 types of link type.
Access Link: A segment which provides the link path for one or more stations to the
VLAN-aware device. An Access Port (untagged port), connected to the access link, has an
untagged VID (also called PVID). After an untagged frame gets into the access port, the
switch will insert a four-byte tag in the frame. The contents of the last 12-bit of the tag
is untagged VID. When this frame is sent out through any of the access port of the same
PVID, the switch will remove the tag from the frame to recover it to what it was. Those
ports of the same untagged VID are regarded as the same VLAN group members.
Trunk Link: A segment which provides the link path for one or more VLAN-aware devices
(switches). A Trunk Port, connected to the trunk link, has an understanding of tagged
frame, which is used for the communication among VLANs across switches. Which frames
of the specified VIDs will be forwarded depends on the values filled in the Tagged VID
column field. Please insert a comma between two VIDs.
802.1Q Configuration
[note]
Because the access port doesn’t have an understanding of tagged frame, the
column field of Tagged VID is not available.
>
>
[note]
1. A trunk port doesn’t insert tag into an untagged frame, and therefore the
untagged VID column field is not available.
2. It’s not necessary to type ‘1’ in the tagged VID. The trunk port will forward the
frames of VLAN 1.
3. The trunk port has to be connected to a trunk/hybrid port of the other switch.
Both the tagged VID of the two ports have to be the same.