Subnet Based Vlans - ZyXEL Communications XGS2220 Series User Manual

Table 202 SWITCHING > VLAN > VLAN Setup > GVRP (continued)
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56.7 Subnet Based VLANs

Subnet based VLANs allow you to group traffic into logical VLANs based on the source IP subnet you
specify. When a frame is received on a port, the Switch checks if a tag is added already and the IP
subnet it came from. The untagged packets from the same IP subnet are then placed in the same
subnet based VLAN. One advantage of using subnet based VLANs is that priority can be assigned to
traffic from the same IP subnet.
Note: Subnet based VLAN applies to un-tagged packets and is applicable only when you use
IEEE 802.1Q tagged VLAN.
For example, an ISP (Internet Services Provider) may divide different types of services it provides to
customers into different IP subnets. Traffic for voice services is designated for IP subnet 172.16.1.0/24,
video for 192.168.1.0/24 and data for 10.1.1.0/24. The Switch can then be configured to group incoming
traffic based on the source IP subnet of incoming frames.
You configure a subnet based VLAN with priority 6 and VID of 100 for traffic received from IP subnet
172.16.1.0/24 (voice services). You also have a subnet based VLAN with priority 5 and VID of 200 for
traffic received from IP subnet 192.168.1.0/24 (video services). Lastly, you configure VLAN with priority 3
and VID of 300 for traffic received from IP subnet 10.1.1.0/24 (data services). All untagged incoming
frames will be classified based on their source IP subnet and prioritized accordingly. That is video
services receive the highest priority and data the lowest.
Figure 274 Subnet Based VLAN Application Example
Chapter 56 VLAN
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Click Apply 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.
Click Cancel to begin configuring this screen afresh.
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