Comnet CNGE2FE8MSPOE Technical Information Page 89

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802.1Q Configuration
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.
Note: Because the access port doesn’t have an understanding of tagged frame, the column
field of Tagged VID is not available.
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