The value of tmnxOamPingCtlVRtrID specifies the virtual router to be
used for the test. The value specified must be the index of an active
row in TIMETRA-VRTR-MIB::vRtrConfTable.
This object is applicable if tmnxOamPingCtlTestMode is 'icmpPing' or
'mrInfo'.
When directing an 'icmpPing' or 'mrInfo' test to use a virtual router
associated with a VPRN service, the virtual router can be specified
using tmnxOamPingCtlVRtrID (with the VPRN's virtual router number) or
tmnxOamPingCtlServiceId (with the VPRN's service number).
tmnxOamPingCtlServiceId is preferred, because service numbers are
constant across an SROS reboot (while virtual routers may be
renumbered). If non-default values are specified for both
tmnxOamPingCtlVRtrID and tmnxOamPingCtlServiceId,
tmnxOamPingCtlServiceId is used.
Setting this object is optional.