20.1.8 Notes on Connecting with SNMP Manager

(1) Tuning MIB collection interval

To detect a new device on a network or to monitor traffic conditions, an SNMP manager extracts MIBs regularly from devices supported by the SNMP agent. If the interval for extracting MIBs is too short, the load on the network device or network itself increases. In addition, depending on the switch status or the configuration, a timeout might occur on the SNMP manager when it extracts a MIB. In particular, the possibility of a response timeout is high in the following cases:

• When too many SNMP managers are connected

  When many SNMP managers are connected to a Switch and the operations for collecting MIB information result in congestion

• When many SNMP events occur simultaneously

  When a large amount of SNMP notification is sent from the Switch, the Switch acquires MIB or acquires MIB in parallel based on SNMP notifications sent from the Switch.

If responses time out often, adjust the polling cycle or the value of the response monitoring timer for the SNMP manager. The following are the major SMNP manager tuning parameters:

• Polling interval

• Response monitoring timer

• Number of retries when a response monitoring timeout occurs