The name of the virtual router (Unisphere-Data-ROUTER-MIB.usdRouterName)
to be used for authentication on the PPP interface. Setting this object
statically binds the authenticating virtual router with the PPP interface.
If this object is not explicitly set or it is set to null string, then
this object is ignored and the virtual router used for authentication is
determined by other means. On a Set operation, if the value of this object
is not null and does not correspond to an existing virtual router, then
an inconsistentValue error is returned.
Setting this object to non null string returns inconsistentValue value error
if usdPppProfileConfigAuthentication object is none or not configured.