Many elements use string names as keys in model-driven interfaces instead of the numerical identifiers used in the classic CLI and SNMP.
Note: The string name can only be assigned or modified for these elements in releases before Release
            15.1.R1. Elements without names are automatically assigned a name (the identifier
            converted to a string) during an upgrade to Release 15.1.R1 or later, and cannot be
            changed without manually deleting and recreating the element. It is recommended that the
            following elements are assigned names before an upgrade to Release 15.1 or later.
- all services (configure service vprn, vpls, epipe, and so on) 
- configure mirror mirror-dest 
- configure service pw-templates 
- configure service customer 
- configure filter ip-filter, ipv6-filter, and mac-filter 
- configure qos network, sap-ingress, and sap-egress 
- configure eth-cfm domain and association