16.1 Introduction to SNMP
SNMP is a kind of simple network management protocol and the most popular protocol with five
functions i.e.: failure control, accounting management, configuration management, performance
management, and safety management. It provides communication format between
network-management application software and agent. There are 4 elements in SNMP network
management protocol: management workstation, agent, information bank, and network
management protocol. The agent is in switch, is the service end to visit the switch by workstation
whose information presents in MIB format, to form management information bank. There are
three operation for SNMP: GET operation, SET operation, and TRAP operation. GET operation
gets the object value agented for workstation. SET operation sets the object value for
workstation. TRAP operation helps agent to inform important events for workstation. TRAP
message is automatically sent to the workstation when something happens in swithch, including
cold-start, hot-start, link up and link down for the port, failed certification of share name, STP
status conversion, and trigger information of EVENT of RMON.
At present there are three editions for SNMP: SNMPV1, SNMPV2, and SNMPV3, the latter
edition is the upgrading edition for the front edition, functions are increased and the safety
performance is improved. iSpirit 3026 switch supports all three SNMP editions, and can make
analysis for SNMP protocol packet of the three editions. One of the SNMPV1, SNMPV2 and
SNMPV3 can be used for sending TRAP messages.
iSpirit 3026 switch supports MIB1 and MIB2, and supports great RFC, BRIDGE, and private MIB
object, and the switch can be managed through SNMP. Following has listed some MIB
supported by iSpirit 3026 switch: RFC 1213
RFC1213-MIB
MIB II All groups except egp and
transmission. RFC 1493
BRIDGE-MIB dot1dBase
and
dot1dStp
groups. RFC 1724
RIPv2-MIB
Conformance groups 1, 2, 3. RFC 1757
RMON-MIB
RMON-Lite (4 RMON1
groups)1-statistics, 2-history, 3-alarm, and 9-event. RFC 1850
OSPF-MIB
OSPFv2 MIB.
Conformance groups 1to 4 and 6 to 13 (traps are notsupported). RFC 1907
SNMPv2-MIB
Conformance groups 5, 6, 7, 8, 9.Also used for SNMPv3. RFC 2233
IF-MIB
Interface group
extension for SMIv2CG= 4, 5, 6, 7, 10, 11, 13. RFC 2571
SNMP-FRAMEWORK-MIB
SNMPv3
MIB. SNMP ManagementFrameworks. CG=1. RFC 2572
SNMP-MPD-MIB
SNMPv3 MIB.
SNMP Message Processing and Scheduling. CG=1. RFC 2573
SNMP-TARGET-MIB
SNMPv3
MIB. Define management targets. CG=1, 2, 3.
SNMP-NOTIFICATION-MIB
SNMPv3 MIB. Notification generation configuration. CG=1, 2.