Veritas Cluster Server Bundled Agents Reference Guide
Veritas⢠Cluster Server Bundled Agents Reference Guide - Symantec
Veritas⢠Cluster Server Bundled Agents Reference Guide - Symantec
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52<br />
Network agents<br />
NIC agent<br />
Note: The NIC agent supports Internet Protocol Version 6 (IPv6) networks.<br />
However, the support is limited to mixed mode (IPv4 and IPv6) configurations<br />
only. The NIC agent does not work in a pure IPv6 network environment.<br />
Agent functions<br />
This agent supports intelligent resource monitoring and uses Intelligent<br />
Monitoring Framework (IMF) for resource state change notifications. The agent<br />
relies on the network and hardware events raised by the operating system. For<br />
example, an event is raised when a network adapter is disabled.<br />
For more information about IMF, refer to the <strong>Veritas</strong> <strong>Cluster</strong> <strong>Server</strong> Administrator's<br />
<strong>Guide</strong>.<br />
online<br />
offline<br />
monitor<br />
Not applicable.<br />
Not applicable.<br />
If the NIC maintains its connection status, the agent reads the<br />
system-defined variable to determine the status of the resource.<br />
If the NIC does not maintain its connection status, the agent verifies that<br />
the NIC has been assigned an IP address, and sends a ping to all the hosts<br />
listed in the attribute PingHostList. The agent counts the number of<br />
packets received by the NIC before and after the ping. If the count<br />
increases, the resource is marked ONLINE. If the count remains unchanged,<br />
the agent broadcasts a UDP echo request to the address derived from the<br />
administrative IP address and the associated subnet mask. The agent<br />
counts the number of packets received by the NIC before and after the<br />
broadcast. If the count increases, the resource is marked ONLINE. If the<br />
count remains the same or decreases, the resource is marked FAULTED.<br />
The NIC agent also calculates the percentage of erroneous packets<br />
transmitted during each monitor interval. If this percentage exceeds the<br />
value in the MaxTxErrorPercentage attribute for the number of<br />
consecutive monitor intervals specified by the value in the<br />
MaxTxErrInterval attribute, the NIC resource is marked FAULTED.<br />
State definitions<br />
ONLINE<br />
FAULTED<br />
UNKNOWN<br />
Indicates the NIC resource is online.<br />
Indicates a problem with the NIC or that a network link failed.<br />
Indicates the agent encountered errors while monitoring the NIC resource.
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