User's Manual

375 | Roles and Policies Dell Networking W-Series ArubaOS 6.4.x| User Guide
position <number>
See Table 63 for descriptions of these parameters.
User-Derived Role Example
The example rule shown in Figure 37 below sets a user role for clients whose host name (DHCP option 12) has
a value of 6C6170746F70, which is the hexadecimal equivalent of the ASCII string laptop. The first two digits in
the Value field are the hexadecimal value of 12 (which is 0C), followed by the specific signature to be matched.
There are many online tools available for converting ASCII text to a hexadecimal string.
Figure 37 DHCP Option Rule
To identify DHCP strings used by an individual device, access the command-line interface in config mode and
issue the following command to include DHCP option values for DHCP-DISCOVER and DHCP-REQUEST frames
in the controller’s log files:
logging level debugging network process dhcpd
Now, connect the device you want to identify to the network, and issue the CLI command show log network.
The sample below is an example of the output that may be generated by this command.
Be aware that each device type may not have a unique DHCP fingerprint signature. For example, devices from
different manufacturers may use vendor class identifiers that begin with similar strings. If you create a DHCP-
Option rule that uses the starts-with condition instead of the equals condition, the rule may assign a role or
VLAN to more than one device type.