HP BL260c HP Flex-10 technology - Page 9

Figure 5. Double-tagged packets in VLAN mapping mode OS TAG OS TAG OS TAG OS TAG VM BladeSystem server Flex10 LOM/ FlexNIC FlexNIC FlexNIC FlexNIC Mezz Card port 01 Double Tagged 1Gb server VNET VNET 1Gb server VNET VNET VVNNEETT VVNNEETT VVNNEETT Uplink Data Center Switch Shared Uplink VVNNEETT Flex-10 Enet VC Module The mapping mode is more efficient and is preferred over tunneling. The primary reason to use tunneling is that more VLANs can be used on a tunneling connection than on a mapped connection. Thirty two VLANs is the current limit on a mapped connection. If more than thirty two VLANS are required on a single link, the administrator must use tunneling. Although the tunneling and mapping graphics in Figures 4 and 5 show only one 10Gb port for the LOM or mezzanine card, all FlexNIC devices have two ports as shown in Figure 2. NOTE: Mapping is supported on current VC, non-Flex-10, 1G NICs as well. Server VLAN mapping was introduced in the 1.31 version of Virtual Connect Manager firmware and that support extends to the individual FlexNICs in the Flex-10 environment. Flex-10 Components Flex-10 technology hardware consists of three components, the 10Gb Flex-10 LOM, the 10Gb Flex10 mezzanine card, and the HP Virtual Connect Flex-10 10Gb Ethernet Module. 9