Chapter 9 VLAN
GS2220 Series User’s Guide
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9.8 Pro to c o l Ba se d 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 for ARP traffic received on port 1, 2 and 3. You
also have a protocol based VLAN B with priority 2 for Apple Talk traffic received on port 6 and 7. All
upstream ARP traffic from port 1, 2 and 3 will be grouped together, and all upstream Apple Talk traffic
from port 6 and 7 will be in another group and have higher priority than ARP traffic, when they go
through the uplink port to a backbone switch C.
Fig ure 118 Protocol Based VLAN Application Example
9.8.1 C o nfig uring Pro to c o l Ba se d VLAN
Click the Pro to c o l Ba se d VLAN Se tup link in the VLAN Config ura tio n screen to display the configuration
screen as shown.
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.
Select an entry’s check box to select a specific entry. Otherwise, select the check box in the
table heading row to select all entries.
Delete Click this to delete the subnet based VLANs which you marked for deletion.
Cancel Click Ca nc e l to clear the check boxes.
Table 54 Advanced Application > VLAN > VLAN Configuration > Subnet Based VLAN Setup (continued)
LABEL DESC RIPTIO N
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