1-2SNMP NMS and SNMP agent. Community name functions as password. It can limit accesses made bySNMP NMS to SNMP agent. You can perform the following community name-related configuration.z Specifying MIB view that a community can access.z Set the permission for a community to access an MIB object to be read-only or read-write.Communities with read-only permissions can only query the device information, while those withread-write permission can configure the device as well.z Set the basic ACL specified by the community name.Supported MIBsAn SNMP packet carries management variables with it. Management variable is used to describe themanagement objects of the device. To uniquely identify the management objects of the device, SNMPadopts a hierarchical naming scheme to organize the managed objects. It is like a tree, with each treenode representing a managed object, as shown in Figure 1-1. Each node in this tree can be uniquelyidentified by a path starting from the root.Figure 1-1 Architecture of the MIB treeA261521121BThe management information base (MIB) describes the hierarchical architecture of the tree and it is theset defined by the standard variables of the monitored network devices. In the above figure, themanaged object B can be uniquely identified by a string of numbers {1.2.1.1}. The number string is theobject identifier (OID) of the managed object.The common MIBs supported by devices are listed in Table 1-1.Table 1-1 Common MIBsMIB attribute MIB content Related RFCMIB II based on TCP/IP network device RFC 1213RFC 1493BRIDGE MIBRFC 2675RIP MIB RFC 1724RMON MIB RFC 2819Ethernet MIB RFC 2665OSPF MIB RFC 1253Public MIBIF MIB RFC 1573
