The value of vRtrIfCpmProtPolicyId associates a CPM Protection policy with an interface. A value of zero (0) specifies that no CPM Protection policy is associated with this interface. A value of one (1) specifies that the default CPM Protection policy is associated with this interface. If no value for vRtrIfCpmProtPolicyId is specified when the vRtrIfEntry is created, the system assigns a default value, derived from the value of the object vRtrIfType, as follows: vRtrIfType vRtrIfCpmProtPolicyId network 1 service used internally. serviceIes 1 serviceRtdVpls obsoleted. serviceVprn 1 serviceIesSubscriber 0 serviceIesGroup 0 serviceVprnSubscriber used internally. serviceVprnGroup 0 serviceIesRedundant 0 serviceVprnRedundant 0 serviceVpls 0 serviceIesCem defined on a SAP. serviceVprnCem defined on a SAP. serviceVprnIPsec 0 serviceVprnIPMirror 0 If an interface would get a default value of 'one', it is not allowed to set the value of vRtrIfCpmProtPolicyId to 'zero'. If an interface would get a default value of 'zero', it is not allowed to modify the value of vRtrIfCpmProtPolicyId. This object is not supported on SR-1 and ESS-1, where the value of TN-CHASSIS-MIB::tmnxChassisType is '5', and 7710, where the value of TN-CHASSIS-MIB::tmnxChassisType is '7' or '9'.