Net-SNMP contains a reasonably full implementation of the AgentX agent extensibility protocol (RFC 2741) in as much as it supports all the protocol operations described in this document. The core functionality has received a reasonable amount of exposure, and is believed to be more or less stable in normal use. It will also handle the non-graceful termination of subagents - returning a 'genErr' error for three successive requests before unregistering the unresponsive subagent. A subagent will attempts to re-establish contact with a dead and resurrected master based on the agentxPingInterval setting. The default for this configuration variable is 15 seconds. It can be changed by putting the following line in your APPLICATION.conf file: agentxPingInterval 60 will make the subagent try to ping the master every 60 seconds, and if the connection is deemed broken it'll try and reconnect to the master agent after that point (once every 60 seconds). Similarly, a subagent will not be able to re-register in place of a defunct colleague until the master agent has received three requests for the dead connection (and hence unregistered it). Some of the less frequently used features (index allocation, range registration, etc), have received less thorough testing, and may well not be fully functional. Some of the omissions of the earlier release (use of GetBulk, the AgentX MIB) are still missing from this version. AgentX support is now included in the agent by default, but needs to be explicitly enabled before use. Activate it using by putting a line master agentx in the snmpd.conf file. This support is also enabled automatically when the '-x' flag is given (to specify a different master AgentX socket), or when the agent is invoked as an AgentX subagent (i.e. via the name 'agentxd' or with the '-X' flag). See the main project web page for an examples of a simple stand-alone subagent. (http://www.net-snmp.org/tutorial/tutorial-5/toolkit/) Please report any problems experienced to the net-snmp-coders list. Dave
Last modified: Thursday, 26-May-2011 23:21:31 UTC
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