If the NIC's installed in your system have a two letter prefix of either "EI" or "EW", then it is not necessary to define the logical name since those two prefixes are already built-in to the agent. The latter is contrary to the information provided in the CA System Watchdog for OpenVMS Administrators Guide, which states:
The built-in list is "XQ, XE, ET, ES, EX". The logical name definition is in the same format as the built-in list.
On the other hand, if the NIC's installed in your system have a device name prefix that is something other than "EI","EW',"XQ","XE","ET","ES", or "EX", then you must define the logical name SNS$ADD_ETHERNET_DEVNAME with an equivalence name consisting of a comma-separated list of prefixes. What follows are two hypothetical examples of how the logical name would be defined for NIC's with device name prefixes of "EN" and "EV". Note that the logical name must be defined before before the CA System Watchdog agent startup procedure, USW$AGENT$STARTUP.COM, is called.
If you have a NIC named ENA0:, then you must add the following command to your system startup procedures.:
$ DEFINE/SYSTEM SNS$ADD_ETHERNET_DEVNAME "EN"
If you also have a NIC with a device name prefix of EVA0: in addition to the one named ENA0:, the command to define the logical name is as follows:
$ DEFINE/SYSTEM SNS$ADD_ETHERNET_DEVNAME "EN,EV"
Again, the above examples above are hypothetical.