Bilingual Network-Management System

Started by VelMurugan, Dec 11, 2008, 04:30 AM

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Bilingual Network-Management System

Bilingual SNMPv2 network-management systems support both SNMPv1 and SNMPv2. To support this dual-management environment, a management application in the bilingual NMS must contact an agent.

The NMS then examines information stored in a local database to determine whether the agent supports SNMPv1 or SNMPv2. Based on the information in the database, the NMS communicates with the agent using the appropriate version of SNMP.

SNMP Reference: SNMPv1 Message Formats

SNMPv1 messages contain two parts: a message header and a protocol data unit (PDU)
SNMPv1 message headers contain two fields: Version Number and Community Name.

The following descriptions summarize these fields:

Version number--Specifies the version of SNMP used.
Community name--Defines an access environment for a group of NMSs.

NMSs within the community are said to exist within the same administrative domain. Community names serve as a weak form of authentication because devices that do not know the proper community name are precluded from SNMP operations.

SNMPv1 Protocol Data Unit:

SNMPv1 PDUs contain a specific command (Get, Set, and so on) and operands that indicate the object instances involved in the transaction. SNMPv1 PDU fields are variable in length.

SNMP Reference: SNMPv2 Message Format

SNMPv2 messages consist of a header and a PDU.

SNMPv2 Protocol Data Unit

SNMPv2 specifies two PDU formats, depending on the SNMP protocol operation. SNMPv2 PDU fields are variable in length.

PDU type--Identifies the type of PDU transmitted (Get, GetNext, Inform, Response, Set, or Trap).
Request ID--Associates SNMP requests with responses.
Error status--Indicates one of a number of errors and error types. Only the response operation sets this field. Other operations set this field to zero.
Error index--Associates an error with a particular object instance. Only the response operation sets this field. Other operations set this field to zero.
Variable bindings--Serves as the data field of the SNMPv2 PDU. Each variable binding associates a particular object instance with its current value (with the exception of Get and GetNext requests, for which the value is ignored).

Source : ExpertsForge

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