Understanding snmp traps – Dell POWEREDGE M1000E User Manual
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Fabric OS MIB Reference
53-1001768-01
Understanding SNMP basics
1
Use a MIB browser to access the MIB variables: all MIB browsers perform queries and load MIBs.
Since different vendors vary the information in their private enterprise MIBs, it is necessary to verify
their information. The Fibre Channel MIB standards dictate that certain information be included in
all MIBs: it is the vendors’ responsibility to follow the standards. The standards are as follows:
•
FibreAlliance (FA) MIB: Brocade supports v3.0. and later releases.
•
Fabric Element (FE) MIB: accepted by the Internet Engineering Task Force (IETF).
Brocade supports FE_RCF2837.mib under the MIB-II branch in Fabric OS v6.4.0, v6.3.0,
v6.2.0, v6.1.2_CEE, v6.1.0, v6.0.0, v3.2.0, and v3.1.x and the experimental version,
FE_EXP.mib, in Fabric OS v2.6.x and 3.0.x. This latest version of the FE MIB references the
FRAMEWORK.MIB and, based on the MIB browser, it is necessary to load this MIB before the
FE.MIB. Refer to
on page 6 for more information.
Once loaded, the MAX-ACCESS provides access levels between the agent and management station.
The access levels are as follows:
•
not-accessible
You cannot read or write to this variable.
•
read-create
Specifies a tabular object that can be read, modified, or created as a new row in a table.
•
read-only - Public
You can only monitor information.
•
read-write - Private
You can read or modify this variable.
•
accessible-to-notify
You can read this information only through traps.
Understanding SNMP traps
An unsolicited message that comes to the management station from the SNMP agent on the
device is called a trap. Brocade switches send traps out on UDP port 162 and to any configured
port. In order to receive traps, the management station IP address and severity level must be
configured on the switch. Up to six trap recipients can be configured using Web Tools or the
snmpConfig command. You can define a different message severity level for each recipient so that
some recipients receive all trap messages and others receive only the most critical.
There are two main MIB trap choices:
•
FibreAlliance MIB trap - Associated with the Fibre Alliance MIB (FA-MIB), this MIB manages SAN
switches and devices from any company that complies with Fibre Alliance specifications.
•
Brocade-specific MIB trap - Associated with the Brocade-specific Brocade MIB (SW-MIB),
manages Brocade switches only.
There is some overlap in the functionality of these MIBs. If you enable both SW-MIB and FA-MIB
traps, you could receive duplicate messages for the switch events that trigger the trap.
You can also use these additional MIBs and their associated traps: HA-MIB; FICON-MIB; and
SWEXTTRAP. In FOS v6.4.0, you can use the snmpConfig command to enable or disable all the
MIBs.