The tmnxVrrpOperPingReply is valid only if the VRRP virtual router
instance associated with this entry is a non-owner.
By setting tmnxVrrpOperPingReply to 'true', a non-owner master is
enabled to reply to ICMP Echo requests directed to the virtual
router instance IP addresses.
A non-owner backup virtual router never responds to such ICMP echo
requests irrespective of the value of tmnxVrrpOperPingReply.