wfIpBaseZeroSubnetEnable 1.3.6.1.4.1.18.3.5.3.2.1.1.10

This parameter indicates whether or not 0 subnets are allowed. If they are not allowed, interfaces configured with a 0 subnet will not be allowed. Value 'rip1onasb' implies 'enabled' also RIP1 support on all one or zero subnet