Redes

SNMP
RFC1157 http://www.cis.ohio-state.edu/htbin/rfc/rfc1157.html
SNMP Protocol Overview: http://service.baltnet.ru/info/CIE/Topics/108.htm
IETF RFCs 1155, 1156, and 1157 define the Simple NetworkManagement Protocol (SNMP). The Internet community developed SNMP to allow diverse network objects to participate in a global network management architecture. Network managing systems can pollnetwork entities implementing SNMP for information relevant to a particular network management implementation. Network management systems learn of problems by receiving traps or change notices from networkdevices implementing SNMP.
SNMP Message Format

SNMP is a session protocol which is encapsulated in UDP. The SNMP message format is shown below:
|Version |Community|PDU |
|SNMP message format |

Version
SNMP version number. Both the manager and agent must use the same version of SNMP. Messagescontaining different version numbers are discarded without further processing.
Community
Community name used for authenticating the manager before allowing access to the agent.
PDU
There are fivedifferent PDU types: GetRequest, GetNextRequest, GetResponse, SetRequest, and Trap. A general description of each of these is given in the next section.
PDU Format

The format for GetRequest,GetNext Request, GetResponse and SetRequest PDUs is shown here.
|PDU type |

PDU type
Specifies the type of PDU:
|0|GetRequest. |
|1 |GetNextRequest. |
|2 |GetResponse.|
|3 |SetRequest. |

Request ID
Integer field which...