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8.2 SNMP Agent and MIB-2 (RFC1213)
The SNMP Agent running on the Switch manager CPU is responsible for:
Retrieving MIB counters from various layers of software modules according to the SNMP
GET/GET NEXT frame messages.
Setting MIB variables according to the SNMP SET frame message.
Generating an SNMP TRAP frame message to the Network Management Station if the threshold
of a certain MIB counter is reached or if other trap conditions (such as the following) are met:
- Warm start - Authentication failure
- Cold start - Rising alarm
- Link up - Falling alarm
- Link down - Topology change
MIB-2 defines a set of manageable objects in various layers of the TCP/IP protocol suites. MIB-2
covers all manageable objects from layer 1 to layer 4 and, as a result, is the major SNMP MIB
supported by all vendors in the networking industry. The Switch supports a complete implementation of
SNMP Agent and MIB-2.
8.3 RMON MIB (RFC 1757) and Bridge MIB (RFC 1493)
RMON is an abbreviation for the Remote Monitoring MIB (Management Information Base). RMON is a
system defined by the Internet Engineering Task Force (IETF) document RFC 1757, which defines how
networks can be monitored remotely.
RMONs typically consist of two components: an RMON probe and a management workstation:
The RMON probe is an intelligent device or software agent that continually collects statistics about
a LAN segment or VLAN. The RMON probe transfers the collected data to a management
workstation on request or when a pre-defined threshold is reached.
The management workstation collects the statistics that the RMON probe gathers The workstation
can reside on the same network as the probe, or it can have an in-band or out-of-band connection
to the probe.