[CAUSE] The vRtrRsvpPEFailOverPriToStdBy notification is raised when primary Provider Edge (PE) has switched over to standby PE. The IP address of the primary PE can be extracted from the vRtrPimNgMvpnUMHPEAddrType and vRtrPimNgMvpnUMHPEAddr indexes of the varbinds in this notification. [EFFECT] The tunnel traffic may be affected. [RECOVERY] None required.