The value of tmnxOamPingCtlRouterInstanceName specifies the name of the service or virtual router(s) used to transmit the test's probes. Supported values vary with the test type, as follows. tmnxOamPingCtlTestMode Names Supported 'dnsPing' 'Base' '_Base_and_management' 'management' <VPRN-service-name> 'icmpPing' '' (i.e. the empty string), 'Base' 'management' 'vpls-management' <CPM-virtual-router-name> <VPRN-service-name> otherwise not relevant. '_Base_and_management' specifies the 'dnsPing' test will send back to back DNS name resolution requests to the specified DNS server (as configured using tmnxOamPingCtlTgtAddress) using the Base router and the management router. The first successful reply is used. The timeout configured using tmnxOamPingCtlTimeOut applies to the two requests simultaneously. This option exists to match the day-one behavior of 'dnsPing' (when the router-instance was not configurable). A <CPM-virtual-router-name> is a user-configured TIMETRA-VRTR-MIB::vRtrName, with TIMETRA-VRTR-MIB::vRtrType = 'vr(3)'. A <VPRN-service-name> is a TIMETRA-SERV-MIB::svcName, with TIMETRA-SERV-MIB::svcType = 'vprn(4)'. Names other than the names listed above are accepted, but will not lead to a successful test. The service or virtual router(s) used by a 'dnsPing' test can only be specified using tmnxOamPingCtlRouterInstanceName. For 'dnsPing', the default is '_Base_and_management'. The service or virtual router used by an 'icmpPing' test can be specified using tmnxOamPingCtlVRtrID, tmnxOamPingCtlServiceId, and/or tmnxOamPingCtlRouterInstanceName. The following two combinations of the three objects are supported: 1. tmnxOamPingCtlVRtrID = 0, tmnxOamPingCtlServiceId = 0, tmnxOamPingCtlRouterInstanceName != ''. This is the preferred approach. 2. One or both of tmnxOamPingCtlVRtrID and tmnxOamPingCtlServiceId has a non-zero value, tmnxOamPingCtlRouterInstanceName = ''. An attempt to change TIMETRA-SYSTEM-MIB::tmnxSysMgmtIfWriteMode.0 away from 'classic(1)' is blocked if tmnxOamPingCtlRouterInstanceName is empty for an 'icmpPing' test. When TIMETRA-SYSTEM-MIB::tmnxSysMgmtIfWriteMode.0 is not 'classic(1)', each 'icmpPing' test must continue to have a non-empty tmnxOamPingCtlRouterInstanceName.