SNMP Configuration and Management Manual

IPX/SPX Subagent (G-Series)
SNMP Configuration and Management Manual—424777-006
13-7
Connections Between Subagent and Other
Processes
setting the value of tdmNwSaRefreshNow in the tdmNwSaConfig group to
forceDynamicRefresh.
The subagent obtains statistical values for zipx group objects from statistics maintained
by IPXPROTO processes the subagent is configured to monitor. Two objects in
tdmNwInfoTable entries provide information about these statistics:
•
The value of tdmNwInfoResetTime indicates the time at which the statistics were
last initialized (set to zero). Statistics are initialized by using the SCF STATS
PROCESS command with the RESET option.
•
The value of tdmNwInfoSampleTime indicates the time at which the statistics were
last sampled by the subagent. Use this object to determine whether the
IPXPROTO process values are current enough for your needs.
•
When the subagent retrieves values from an IPXPROTO process, it waits 10
seconds for a reply from the process. If it receives no reply, the subagent
generates a NoSuchName error in response to the request that fostered
IPXPROTO process access. The subagent also generates an object-unavailable
EMS event and sets the values of two objects in the tdmNwSaIPXPROTONames
Table:
•
The value of tdmNwSaIpxProtoState is set to disconnected.
•
The value of tdmNwSaIpxProtoStateReason is set to resourceproblem.
The timeout value is not configurable.
Connections Between Subagent and Other Processes
The IPX/SPX Subagent communicates with various processes:
One or more IPXPROTO processes
One or more SNMP agent processes
One EMS collector process
The subagent regularly monitors all the processes with which it communicates to
determine whether connections to the processes are intact. When a connection has
been lost for any reason other than an SNMP manager request, the subagent attempts
to re-establish the connection. This feature minimizes the need for your monitoring the
state of subagent connections. The rate at which the subagent attempts to re-establish
lost connections, known as the keep-alive rate, is set using the -k startup parameter or
its corresponding MIB object, tdmNwSaKeepAliveTimer.
You identify processes with which the subagent should interact when you start the
subagent. You can modify or extend process connections after startup by setting the
value of objects in the zisa group:
•
The -i startup parameter identifies IPXPROTO processes that the subagent should
monitor. After startup, you use tdmNwSaIPXPROTONamesTable group objects to
control IPXPROTO process connections.