The value of vRtrMplsTpIfNumValidation specifies whether or not the node will perform the validation of vRtrMplsTpIfNum. If the value of vRtrMplsTpIfNumValidation is 'enabled (1)', the node performs the validation of the ingress and egress if-nums received in the LSP echo request messages that ingress on this MPLS interface. It validates that the message arrives on the interface as identified by the ingress if-num, and is forwarded on the interface as identified by the egress if-num. If the value of vRtrMplsTpIfNumValidation is 'disabled (2)', no validation is performed for the ingress and egress if-nums received in the LSP echo request messages that ingress on this MPLS interface.