1-3Subtree maskA subtree OID used with a subtree mask defines a view subtree. A subtree mask is in hexadecimalformat. After it is converted to binary bits, each bit corresponds to a node of the OID.z 1 means precise matching, that is, the OID of the MIB object to be accessed must be identical withthe subtree OID.z 0 means wildcard matching, that is, the OID of the MIB object to be accessed can be different fromthe subtree OID.For example, provided the subtree mask 0xDB (11011011 in binary) and the subtree OID 1.3.6.1.6.1.2.1,their relationship is as shown in Figure 1-3. The view determined by them includes all the nodes underthe subtree whose OID is 1.3.*.1.6.*.2.1, where * represents any number.Figure 1-3 Subtree OID and subtree maskz If the number of bits in the subtree mask is greater than the number of nodes of the OID, theexcessive bits of the subtree mask will be ignored during subtree mask-OID matching.z If the number of bits in the subtree mask is smaller than the number of nodes of the OID, the shortbits of the subtree mask will be set to 1 during subtree mask-OID matching.z If no subtree mask is specified, the default subtree mask (all Fs) will be used for mask-OIDmatching.SNMP ConfigurationConfiguration Task ListAs configurations for SNMPv3 differ substantially from those for SNMPv1 and SNMPv2c, theirconfiguration tasks are introduced separately as follows.Configuring SNMPv1 or SNMPv2cPerform the tasks in Table 1-1 to configure SNMPv1 or SNMPv2c:Table 1-1 SNMPv1 or SNMPv2c configuration task listTask RemarksEnabling SNMP RequiredThe SNMP agent function is disabled by default.Configuring an SNMP ViewOptionalAfter creating SNMP views, you can specify an SNMP viewfor an SNMP community to limit the MIB objects that can beaccessed by the SNMP community.
