HP Virtual Connect 8Gb 24-port Fibre Channel Module for c-Class BladeSystem - Manual (Page 148)

Virtual Connect server profiles 148
enter a range of locally-owned MAC addresses. HP does not recommend using the server factory default
because these addresses do not move when the server profile is assigned to a new physical server blade.
VCM assigns or migrates MAC addresses for server Ethernet ports connected to VC-Enet modules. VCM also
assigns MAC addresses to server Ethernet ports that are not connected to an I/O module because VC
modules can be added later. Server Ethernet ports connected to non-VC modules retain the server factory
default MACs addresses. Only ports that have connections assigned in the server profile are assigned MAC
addresses. Any unassigned ports, which includes Flex-10 connections, retain their factory default MAC
addresses.
When using HP pre-defined or user-defined MAC address ranges, only use each range once within the same
layer 2 network to avoid multiple servers having the same MAC addresses. After MAC addresses have been
assigned as part of creating a server profile, this setting cannot be changed.
Only users with network privileges can change this screen. No changes in MAC address ranges are
permitted after server profiles are created. You must delete all server profiles to change the MAC address
range settings.
For more information, see "MAC address settings (on page
148 )."
MAC address settings
IMPORTANT: Configuring Virtual Connect to assign server blade MAC addresses requires
careful planning to ensure that the configured range of MAC addresses is used once within the
environment. Duplicate MAC addresses on an Ethernet network can result in a server network
outage.
Each server blade Ethernet NIC ships with a factory default MAC address. The MAC address is a 48-bit
number that uniquely identifies the Ethernet interface to other devices on the network. While the hardware