Allied Telesis AT-S63 - Manual (Page 690)

Chapter 29: MAC Address-based VLANs
690 Section VI: Virtual LANs
VLAN Hierarchy
The switch’s management software employs a VLAN hierarchy when
handling untagged packets that arrive on a port that is an egress port of a
MAC address-based VLAN as well as an untagged port of a port-based
VLAN. (A port can be a member of both types of VLANs at the same time.)
The rule is that a MAC address-based VLAN takes precedence over that
of a port-based VLAN.
When an untagged packet arrives on a port, the switch first compares the
source MAC address of the packet against the MAC addresses of all the
MAC address-based VLANs on the device. If there is a match, the switch
considers the packet as belonging to the corresponding MAC address-
based VLAN and not to the port-based VLAN, and forwards it out the
egress ports defined for the corresponding MAC address-based VLAN.
If there is no match, the switch considers the packet as belonging to the
port-based VLAN and forwards the packet according to the PVID assigned
to the port. For an explanation of a PVID, refer to “Port-based VLAN
Overview” on page 600.
Steps to Creating
a MAC Address-
based VLAN
Here are the three main steps to creating a MAC address-based VLAN:
1. The first step is to assign the VLAN a name and a VID. You must also
set the VLAN type to MAC Based. This is explained in “Creating a
MAC Address-based VLAN” on page 693.
2. You assign the MAC addresses to the VLAN. This is explained in
“Adding and Deleting MAC Addresses” on page 696.
3. Finally, you assign the egress ports to the MAC addresses, as
explained in “Adding and Deleting Egress Ports” on page 698.
The steps must be performed in this order.
Table 26. Example of a MAC Address-based VLAN Spanning Switches
Switch A Switch B
VLAN Name: Sales VLAN Name: Sales
MAC Address Egress Ports MAC Address Egress Ports
Address_1 1,3,4,5 Address_1 11,12,14,16
Address_2 1 Address_2 11
Address_3 1 Address_3 11
Address_4 1 Address_4 11
Address_5 1 Address_5 11
Address_6 1 Address_6 11