eSNMP API Routines esnmp_register2

When restarting the eSNMP protocol by calling esnmp_init, all MIB subtree registrations are cleared. All MIB subtrees must be reregistered.

A MIB subtree is identified by the base MIB variable name and its corresponding OID. This tuple represents the parent of all MIB variables that are contained in the MIB subtree; for example, the MIB II tcp subtree has an OID of 1.3.6.1.2.1.6. All elements subordinate to this (those that have the same first 7 identifiers) are included in the subtree’s object table. A MIB subtree can also be a single MIB object (a leaf node) or even a specific instance.

By registering a MIB subtree, the subagent indicates that it will process SNMP requests for all MIB variables (or OIDs) within that MIB subtree’s region. Therefore, a subagent should register the most fully qualified (longest) MIB subtree that still contains its instrumented MIB variables.

A subagent using the esnmp_register2 routine can register the same MIB subtree for the local node and for a cluster. To register the MIB subtree for both, you must call the esnmp_register2 routine twice: once with the ESNMP_REG_OPT_CLUSTER bit set in the options field and once with the ESNMP_REG_OPT_CLUSTER bit clear in the options field. Alternatively, you can register a MIB subtree for the cluster only or for the local node only, by setting or clearing the ESNMP_REG_OPT_CLUSTER bit, respectively, in the options field.

A subagent can also register MIB subtrees that overlap the OID range of MIB subtrees that it previously registered or the OID ranges of MIB subtrees registered by other subagents.

For example, consider the two subagents os_mibs and gated. The os_mibs subagent registers the ip MIB subtree (1.3.6.1.2.1.4), and the gated subagent registers the ipRouteEntry MIB subtree (1.3.6.1.2.1.4.21.1). Both of these registrations are made with the ESNMP_REG_OPT_CLUSTER bit set in the options field. Requests for ip MIB variables within ipRouteEntry, such as ipRouteIfIndex (1.3.6.1.2.1.4.21.1.2), are passed to the gated subagent. Requests for other ip variables, such as ipNetToMediaIfIndex (1.3.6.1.2.1.4.22.1.1), are passed to the os_mibs subagent. If the gated subagent terminates or unregisters the ipRouteEntry MIB subtree, subsequent requests for ipRouteIfIndex go to the os_mibs subagent. This occurs because the ip MIB subtree, which includes all ipRouteEntry MIB variables, is now the authoritative region of requests for ipRouteIfIndex.

Return Values

SNMP_LIB_OK

The esnmp_register2 routine has completed

 

successfully.

ESNMP_LIB_BAD_REG

The esnmp_init routine has not been called, the

 

timeout parameter is invalid, a registration slot

 

is not available, or this MIB subtree has already

 

been queued for registration. A message is also

 

in the log file.

ESNMP_LIB_LOST_

The subagent lost communication with the

CONNECTION

master agent.

Note that the return value indicates only the initiation of the request. The actual status returned in the master agent’s response will be returned in a subsequent call to the esnmp_poll routine in the state field.

eSNMP API Routines 5–9

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Compaq AAR04BCTE manual Esnmpregister2 routine has completed
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