Traps; Management Information Base; User Datagram Protocol; Numbering System Conventions - HP StorageWorks 8/20q Reference Manual

Traps

Traps are notification messages sent from the switch to a registered manager when a change of state
occurs within the switch. A change of state can be an alarm condition or simply a configuration change.
The Fibre Alliance MIB defines a trap table configurable through SNMP. A trap table may have up to five
entries, and can be configured using the SNMP manager, the QuickTools web applet, Simple SAN
Connection Manager, or Enterprise Fabric Management Suite.
A trap event is reported when the incoming error has a severity level that is less than or equal to the
configured severity level. The trap event types and trap severity levels are listed in
Table 1

Trap severity levels

Event
Unknown
Emergency
Alert
Critical
Error
Warning
Notify
Info
Debug
Mark

Management Information Base

The Management Information Base (MIB) defines the properties of the managed object within the device to
be managed. Every managed device keeps a database of values for each definition written in the MIB. It
is not the actual database itself; it is implementation dependent. The definition of the MIB conforms to the
Structure of Management Information (SMI) in the Request For Comment (RFC) 1 155. The latest Internet MIB
is in RFC 1213 and is sometimes called MIB-II.

User Datagram Protocol

The SN6000 and 8/20q Fibre Channel Switches support the following UDP settings:
• Agents listen on UDP port 161.
• Responses are sent back to the originating Network Management Station (NMS) port from a dynamic
port, although many agents use port 161 also for this target.
• The maximum SNMP message size is 65507 octets (maximum UDP message size).
• The minimum receive packet size for SNMP implementations is 484 octets in length.
• Agent and Network Monitoring Systems are responsible for determining error recovery.

Numbering system conventions

The conventions for numbering systems in this guide are as follows:
Decimal =101
•
• Hexadecimal = 0x101
• Binary = 101b
16 SNMP Overview
Severity Levels
1
2
3
4
5
6
7
8
9
10
Table 1.