User's Manual

Components 177
order in Table 25). For example, 3Com Network Director will not be able
to determine the User Name for a cloud, and so will use the Custom
Name if it is set, or the System Name otherwise.
Vendor Translation of MAC Addresses
The MAC address of a device is divided into two 24-bit halves. The first
half is known variously as the Organizationally Unique Identifier (OUI), the
“company_id” or the vendor ID, and can be used to identify the device’s
manufacturer. The second half is a unique ID provided by the device’s
manufacturer.
3Com Network Director can automatically determine the manufacturer of
each device on the network that has a MAC address by translating the
OUI portion of the MAC address from its hexadecimal representation to
the manufacturer’s name. This changes the display, when the MAC
Address label type is selected from View
> Labels, as follows:
Figure 60 MAC Address label display (1)
becomes: