Network Reachability Monitoring

All management interfaces of managed servers and all platform interfaces are monitored by default by the N1 System Manager. Platform interfaces include the service processor's management interface, such as eth0, and data network interfaces, such as eth1 or eth2.

Reachability is verified for Linux servers and servers running the Solaris OS by using an ICMP ping to the interface IP address.

The reachability of all network interfaces is verified at regular intervals. The monitoring of network reachability is based on the IP address. If any monitored IP address is unreachable, an event is generated.

You can filter information for all servers by using the show server command with the appropriate parameters to view monitoring information. See show server in Sun N1 System Manager 1.3 Command Line Reference Manual for details.

Understanding the Differences Between Unreachable and Unknown States for Managed Servers

Distinguishing between the unreachable and unknown states for managed servers is important.

N1-ok> show server oshealth unreachable

This command lists all managed servers that are unreachable. Any managed server returned in the output of this command is unreachable due to a network problem: the server cannot be contacted about its hardware health status. The ping command to the server is unsuccessful. This behavior does not necessarily mean that the server is not transmitting hardware health status information. The server could be in standby mode.

N1-ok> show server oshealth unknown

This command lists all managed servers that are not returning any information about hardware health status. The ping command might be successful but servers returned in the output of this command are not returning any hardware health information. The agent for the monitoring feature could not be contacted on port 161.

N1-ok> show server power unreachable

This command lists all managed servers that are unreachable. Any server returned in the output of this command is unreachable due to a network problem: the server cannot be contacted about its power status. The ping command to the server is unsuccessful. This behavior does not necessarily mean that the server is not transmitting power status information. The server could be in standby mode.

N1-ok> show server power unknown

This command lists all managed servers that are not returning any information about power status. The ping command might be successful but servers returned in the output of this command are not returning any power status information. The agent for the monitoring feature could not be contacted on port 161.

N1-ok> show server oshealth unreachable

This command lists all managed servers that are unreachable. Any server returned in the output of this command is unreachable due to a network problem: the server cannot be contacted about its OS health. The ping command to the server is unsuccessful. This behavior does not necessarily mean that the server is not transmitting OS health information. The server could be in standby mode.

N1-ok> show server oshealth unknown

This command lists all managed servers that are not returning any information about OS health. The ping command might be successful but servers returned in the output of this command are not returning any OS health information. The agent for the monitoring feature could not be contacted on port 161.