Simple Network Management Protocol (SNMP) defines a standard way for network management stations running on PCs or workstations
to monitor the health and status of many types of devices, including switches, routers, and security appliances. You can use
the SNMP page to configure a firewall device for monitoring by SNMP management stations.
The Simple Network Management Protocol (SNMP) enables monitoring of network devices from a central location. Cisco security
appliances support network monitoring using SNMP versions 1, 2c, and 3, as well as traps and SNMP read access; SNMP write
access is not supported.
You can configure a security appliance to send “traps” (event notifications) to a network management station (NMS), or you
can use the NMS to browse the management information bases (MIBs) on the security appliance. Use CiscoWorks for Windows or
any other SNMP MIB-II-compliant browser to receive SNMP traps and browse a MIB.
The security appliance has an SNMP agent that notifies designated management stations if specified events occur, for example,
when a link in the network goes up or down. The notification includes an SNMP system object ID (OID), identifying the device
to the management stations. The security appliance SNMP agent also replies when a management station asks for information.
SNMP MIBs and OIDs
An SNMP trap reports significant events occurring on a network device, most often errors or failures. SNMP traps are defined
in Management Information Bases (MIBs), which can be either standard or enterprise-specific.
Standard traps and MIBs are created by the Internet Engineering Task Force (IETF) and documented in various RFCs. Standard
traps are compiled into the security appliance software. If needed, you can also download RFCs, standard MIBS, and standard
traps from the IETF website: http://www.ietf.org/ .
For Cisco MIB files and OIDs, refer to: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml . OIDs may be downloaded from this FTP site: ftp://ftp.cisco.com/pub/mibs/oid/oid.tar.gz.
This section contains the following topics: