The value of tmnxOamTrCtlRouterInstanceName specifies the name of the service or router instance to be used by an 'icmpTraceRoute' test. The following values are supported: 1. '' (i.e. the empty string), 2. 'Base', 3. 'management', 4. 'vpls-management', 5. A VPRN service name (i.e. a TIMETRA-SERV-MIB::svcName, with TIMETRA-SERV-MIB::svcType = 'vprn(4)'). 6. A CPM virtual router name (i.e. a user-configured router name, with TIMETRA-VRTR-MIB::vRtrType = 'vr(3)'). Names other than the names listed above are accepted, but will not lead to a successful test. The service or virtual router to be used by an 'icmpTraceRoute' test can be specified using tmnxOamTrCtlVRtrID, tmnxOamTrCtlServiceId, and/or tmnxOamTrCtlRouterInstanceName. The following two combinations of the three objects are supported: 1. tmnxOamTrCtlVRtrID = 0, tmnxOamTrCtlServiceId = 0, tmnxOamTrCtlRouterInstanceName != ''. This is the preferred approach. 2. One or both of tmnxOamTrCtlVRtrID and tmnxOamTrCtlServiceId has a non-zero value, tmnxOamTrCtlRouterInstanceName = ''. An attempt to change TIMETRA-SYSTEM-MIB::tmnxSysMgmtIfWriteMode.0 away from 'classic(1)' is blocked if any tmnxOamTrCtlRouterInstanceName is empty for an 'icmpTraceRoute' test. When TIMETRA-SYSTEM-MIB::tmnxSysMgmtIfWriteMode.0 is not 'classic(1)', each 'icmpTraceRoute' test must continue to have a non-empty tmnxOamTrCtlRouterInstanceName.