Chapter 8 VLAN

Table 19 Advanced Application > VLAN > VLAN Port Setting (continued)

LABEL

DESCRIPTION

Ingress Check

If this check box is selected for a port, the Switch discards incoming

 

frames for VLANs that do not include this port in its member set.

 

Clear this check box to disable ingress filtering.

 

 

PVID

Enter a number between 1and 4094 as the port VLAN ID.

 

 

GVRP

Select this check box to allow GVRP on this port.

 

 

Acceptable

Specify the type of frames allowed on a port. Choices are All, Tag Only

Frame Type

and Untag Only.

 

Select All from the drop-down list box to accept both untagged or

 

tagged frames on this port. This is the default setting.

 

Select Tag Only to accept only tagged frames on this port. All untagged

 

frames will be dropped.

 

Select Untag Only to accept only untagged frames on this port.

 

 

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.

 

 

Apply

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.

 

 

Cancel

Click Cancel to begin configuring this screen afresh.

 

 

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 Service 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 can then 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 can 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 can configure VLAN with priority 3 and VID of 300 for traffic received from IP subnet 10.1.1.0/24 (data

88

 

GS2200-48 User’s Guide