Appendix C. SNMP MIB Structure

• SNMP information in a router is organized as a Management Information Base (MIB).

• A network management system can use SNMP to access data stored in the MIB.

• MIBs represent data as a hierarchical tree structure; each MIB variable is referenced by its object identifier (OID).

• OIDs are formed by concatenating the name or number of a tree branch as the tree is followed from the root to the object’s location, in dotted notation.

Figure C-1 shows the top layers of the standard MIB tree. The root layer is unnamed. All MIB variables that are useful for network management are located under the internet subtree. Following the tree structure downward, internet is referenced as OID, or ...

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