Sony FWD-S47H1 - Handbuch (Seite 11)

2-1
GXD-L52H1
Section 2
SNMP
2-1. SNMP
This unit installs SNMP (Simple Network Management Protocol). SNMP is a standard protocol for
network management that was standardized in IETF (Internet Engineer Task Force).
By using SNMP, the management information of equipment connected to a network can be gotten via a
network. The information of multiple equipment gotten using SNMP can also be unitarily managed by
using SNMP management software.
The equipment corresponding to SNMP has a “management information database” called MIB (Manage-
ment Information Base) in the inside of equipment. In SNMP, the bidirectional communication of data
contained in MIB is realized between a “management system” and “management object system” that exist
in a network.
In MIB, there is the standard MIB prescribed by RFC. Especially, MIB-II is its representative MIB.
MIB-II was established to manage a network. MIB-II is installed in much network equipment such as a
PC, router, and switch as a standard feature. This unit installs this MIB-II.
Monitoring and monitored sides exist when equipment is monitored via a network using SNMP. The
monitoring side is called an “SNMP manager”. It is mainly constituted by the software of PC. For the
monitored side, a module called an “SNMP agent” is installed. SNMP-compatible equipment transmits
MIB information to an SNMP manager via this SNMP agent. This unit installs this SNMP agent. This
unit can realize the communication with a general-purpose SNMP manager using this SNMP agent.
Basically, an SNMP agent replies only when an inquiry is sent from an SNMP manager.
The SNMP manager periodically inquires the equipment, which it manages, about MIB information. This
way to get information is called “polling”. In polling, equipment replies using a response command when
an SNMP manger sends a request command to equipment. By polling, therefore, equipment can be
monitored without applying a high load to the equipment.
On the other hand, notifi cation can also be done from the equipment side to an SNMP manager. This noti-
fi cation is called a “trap”. Using this trap, when a serious trouble occurred in equipment, it can be notifi ed
to the SNMP manager in a short time.
This unit is compatible with the two polling and trap protocols described above. Equipment can be
effi ciently monitored using these protocols.