103
Private VLAN Port Isolation Configuration Parameters:
Items
Description
Port Members
A check box is provided for each port of a private VLAN. When checked, port isolation is
enabled on that port. When unchecked, port isolation is disabled on that port. By default port
isolation is disabled on all ports.
MAC-Based VLAN (VCL)
MAC address-based VLAN decides the VLAN for forwarding an untagged frame based on the source MAC address of the
frame.
A most common way of grouping VLAN members is by port, hence the name port-based VLAN. Typically, the device
adds the same VLAN tag to untagged packets that are received through the same port. Later on, these packets can be
forwarded in the same VLAN. Port-based VLAN is easy to configure, and applies to networks where the locations of
terminal devices are relatively fixed. As mobile office and wireless network access gain more popularity, the ports that
terminal devices use to access the networks are very often non-fixed. A device may access a network through Port A
this time, but through Port B the next time. If Port A and Port B belong to different VLANs, the device will be assigned to a
different VLAN the next time it accesses the network. As a result, it will not be able to use the resources in the old VLAN.
On the other hand, if Port A and Port B belong to the same VLAN, after terminal devices access the network through Port
B, they will have access to the same resources as those accessing the network through Port A do, which brings
security issues. To provide user access and ensure data security in the meantime, the MAC-based VLAN technology is
developed. MAC-based VLANs group VLAN members by MAC address. With MAC-based VLAN configured, the device
adds a VLAN tag to an untagged frame according to its source MAC address. MAC-based VLANs are mostly used in
conjunction with security technologies such as 802.1X to provide secure, flexible network access for terminal devices.
To configure MAC Address- Based VLAN in the web interface:
Click Configuration / VCL / MAC-based VLAN
Specify the MAC address and VLAN ID
Click Apply and click the Save icon in the upper right corner to save the settings or click Reset to cancel. The
Form will return to the previously saved settings.