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GigWorks MkII-16 Switch Model MKII-BASE16
Installer's/User's Manual 59003-01 Rev. A
Switch Management 3-53
Managing the Switch Using SNMP
Figure 3-14 Polling-Only Data Collection
Interrupt-Based Data Collection
This method provides immediate notification to the network management station
if an extraordinary event occurs (assuming the node has not crashed and the
communication path between the node and the management station remains
intact). A drawback of this method involves the resources required to generate the
error (or trap). If the error message contains a lot of information, the managed
node expends valuable time and resources generating the error rather than
performing its primary function.
Also, if several identical events occur back-to-back, excessive network
bandwidth is tied up with repeated information. It would be particularly
unfortunate if the errors pertained to network congestion. To avoid this,
thresholds can be established for the managed node regarding when to report
problems. However, threshold monitoring also requires agent resources to
determine the appropriateness of generating a trap.
Figure 3-15 illustrates how a managed node agent interrupts its operation to
report errors to the SNMP management station.
Figure 3-15 Interrupt-Based Data Collection
Trap-Directed Polling Data Collection
This method is a combination of the polling-only and interrupt-based data
collection processes and is a highly effective and efficient means of performing
network management. The management station polls the agents in the managed
nodes to collect data and then displays the data on the console in either numeric
Switch
SNMP
Agent
Mgmt
Station
ALERT! 55% at 4:20 PM
How Much Traffic?
12.5% at 4:15 PM
Mgmt
Station
Switch
SNMP
Agent