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SNMP Protocol Information Notification Using Trap(v2) and InformRequest Messages
(Page 2 of 2)
Use of the SNMPv2 InformRequest Message
SNMPv2 also incorporates a second
notification message type: InformRequest-PDU. This type of message
is not the same as a trap, but it is related to traps for two reasons.
First, both message types are used to communicate information without
the recipient initiating the process, and second, the two messages are
sometimes used in conjunction.
The purpose of the InformRequest-PDU
is actually to facilitate the communication of information between network
management stations. The SNMP Manager on one NMS can choose to inform
another of some piece of information by sending an InformRequest-PDU
to that other SNMP Manager. The receiving manager then replies back
with a Response-PDU to the one that sent the InformRequest-PDU,
confirming receipt of the inform message.
A common way that this message is
used is to spread the news when a trap occurs. Suppose a
device experiences a power failure, which results in a Trapv2-PDU
being sent to NMS #1. The network administrator may want to set up NMS
#1 so that receipt of particular traps causes the information in the
trap to be forwarded to another. The InformRequest-PDU
would be used to carry that information from NMS #1 to say, NMS #2.
Key Concept: SNMP managed devices can inform a network management station of an important occurrence by sending it a Trap-PDU or Trapv2-PDU message. Network administrators determine the circumstances under which one of these messages should be transmitted. SNMPv2 adds to this capability the InformRequest-PDU message, which can be used to propagate information about an event between management stations. |
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Version 3.0 - Version Date: September 20, 2005
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