The value of vRtrPimNgIfGrpSrcAssertTimer indicates the
time remaining before the router transitions the
vRtrPimNgIfGrpSrcAssertState to 'noInfo' if
the value of vRtrPimNgIfGrpSrcAssertState is 'lostAssert'. If
the value of vRtrPimNgIfGrpSrcAssertState is 'wonAssert',
the value of vRtrPimNgIfGrpSrcAssertTimer indicates the
time remaining before it resends the ASSERT message.