Chapter 8 VLAN
Table 17 Advanced Application > VLAN > VLAN Port Setting (continued)
LABEL | DESCRIPTION |
VLAN Trunking | Enable VLAN Trunking on ports connected to other switches or routers (but not |
| ports directly connected to end users) to allow frames belonging to unknown VLAN |
| groups to pass through the Switch. |
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Apply | Click Apply to save your changes to the Switch’s |
| 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 |
| are done configuring. |
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Cancel | Click Cancel to begin configuring this screen afresh. |
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8.6 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.
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 39 Subnet Based VLAN Application Example
Tagged Frames
Internet
Untagged
Frames
172.16.1.0/24 | 192.168.1.0/24 | 10.1.1.0/24 |
VID = 100 | VID = 200 | VID = 300 |
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