HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 119
Configuring MAC-based VLANs, Introduction to MAC-based VLAN, Static MAC-based VLAN assignment
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[DeviceA-GigabitEthernet1/0/3] display vlan 200 VLAN ID: 200 VLAN Type: static Route Interface: not configured Description: VLAN 0200 Name: VLAN 0200 Tagged Ports: GigabitEthernet1/0/3 Untagged Ports: GigabitEthernet1/0/2 Configuring MAC-based VLANs Introduction to MAC-based VLAN The MAC-based VLAN feature assigns hosts to a VLAN based on their MAC addresses. This feature is usually used in conjunction with security technologies such as 802.1X to provide secure, flexible network access for terminal devices. Static MAC-based VLAN assignment Static MAC-based VLAN assignment applies to networks containing a small number of VLAN users. In such a network, you can create a MAC address-to-VLAN map containing multiple MAC address-to-VLAN entries on a port, enable the MAC-based VLAN feature on the port, and assign the port to MAC-based VLANs. With static MAC-based VLAN assignment configured on a port, the device processes received frames by using the following guidelines: • When the port receives an untagged frame, the device looks up the MAC address-to-VLAN map based on the source MAC address of the frame for a match. a. The device first performs a fuzzy match. In the fuzzy match, the device searches the MAC address-to-VLAN entries whose masks are not all-Fs and performs a logical AND operation on the source MAC address and each mask. If the result of an AND operation matches the corresponding MAC address, the device tags the frame with the corresponding VLAN ID. b. If the fuzzy match fails, the device performs an exact match. In the exact match, the device searches the MAC address-to-VLAN entries whose masks are all-Fs. If the MAC address of a MAC address-to-VLAN entry matches the source MAC address of the untagged frame, the device tags the frame with the corresponding VLAN ID. c. If no match is found, the device assigns a VLAN to the frame by using other criteria, such as IP subnet or protocol, and forwards the frame. d. If no VLAN is available, the device tags the frame with the PVID of the receiving port and forwards the frame. • When the port receives a tagged frame, the port forwards the frame if the VLAN ID of the frame is permitted by the port, or otherwise drops the frame. Dynamic MAC-based VLAN assignment When you cannot determine the target MAC-based VLANs of a port, you can use dynamic MAC-based VLAN assignment on the port. To do that, you can create a MAC address-to-VLAN map containing 110