The value of tmnxRadProxSrvLoadBVendorId1 specifies
the RADIUS Vendor-Id associated with tmnxRadProxSrvLoadBAttr3.
If the value of tmnxRadProxSrvLoadBVendorId1 is equal to zero, the
attribute type specified by tmnxRadProxSrvLoadBAttr3 must be
used if it appears outside of a Vendor-Specific attribute.
If the value of tmnxRadProxSrvLoadBVendorId1 is not equal to zero, the
attribute type specified by tmnxRadProxSrvLoadBAttr3 must be
used if it appears as a sub-attribute within a Vendor-Specific attribute
with Vendor-Id equal to the value of tmnxRadProxSrvLoadBVendorId3.