The administritive name for this virtual router. The router
name must be unique among all virtual routers in the system.
For row creation to succeed a value must be specified for vRtrName.
When a row is created in the vRtrConfTable for a service vprn
(i.e. when vRtrType is set to 'vprn'), the agent automatically assigns
the name 'vprn<service-id>'.