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Chapter 9 VLAN
MGS3700-12C User’s Guide
129
9.8 Protocol Based VLANs
Protocol based VLANs allow you to group traffic into logical VLANs based on the
protocol you specify. When an upstream frame is received on a port (configured
for a protocol based VLAN), the Switch checks if a tag is added already and its
protocol. The untagged packets of the same protocol are then placed in the same
protocol based VLAN. One advantage of using protocol based VLANs is that priority
can be assigned to traffic of the same protocol.
Note: Protocol based VLAN applies to un-tagged packets and is applicable only when
you use IEEE 802.1Q tagged VLAN.
For example, port 1, 2, 3 and 4 belong to static VLAN 100, and port 4, 5, 6, 7
belong to static VLAN 120. You configure a protocol based VLAN A with priority 3
Mask-Bits Enter the bit number of the subnet mask. To find the bit number, convert
the subnet mask to binary format and add all the 1’s together. Take
“255.255.255.0” for example. 255 converts to eight 1s in binary. There are
three 255s, so add three eights together and you get the bit number (24).
VID Enter the ID of a VLAN with which the untagged frames from the IP subnet
specified in this subnet based VLAN are tagged. This must be an existing
VLAN which you defined in the Advanced Applications, VLAN screens.
Priority Select the priority level that the Switch assigns to frames belonging to this
VLAN.
Add Click Add to save your changes to the Switch’s run-time memory. The
Switch loses these changes if it is turned off or loses power, so use the
Save link on the top navigation panel to save your changes to the non-
volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
Index This is the index number identifying this subnet based VLAN. Click on any
of these numbers to edit an existing subnet based VLAN.
Active This field shows whether the subnet based VLAN is active or not.
Name This field shows the name the subnet based VLAN.
IP This field shows the IP address of the subnet for this subnet based VLAN.
Mask-Bits This field shows the subnet mask in bit number format for this subnet
based VLAN.
VID This field shows the VLAN ID of the frames which belong to this subnet
based VLAN.
Priority This field shows the priority which is assigned to frames belonging to this
subnet based VLAN.
Delete Click this to delete the subnet based VLANs which you marked for deletion.
Cancel Click Cancel to begin configuring this screen afresh.
Table 19 Advanced Application > VLAN > VLAN Port Setting > Subnet Based VLAN
Setup (continued)
LABEL DESCRIPTION