The value of tmnxRadProxSrvLoadBVendorId5 specifies
the RADIUS Vendor-Id associated with tmnxRadProxSrvLoadBAttr5.
If the value of tmnxRadProxSrvLoadBVendorId5 is equal to zero, the
attribute type specified by tmnxRadProxSrvLoadBAttr5 must be
used if it appears outside of a Vendor-Specific attribute.
If the value of tmnxRadProxSrvLoadBVendorId5 is not equal to zero, the
attribute type specified by tmnxRadProxSrvLoadBAttr5 must be
used if it appears as a sub-attribute within a Vendor-Specific attribute
with Vendor-Id equal to the value of tmnxRadProxSrvLoadBVendorId5.