D-Link DES-2108 User manual - Traps
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Managed devices that support SNMP include software (referred to as
an agent), which runs locally on the device. A defined set of variables
(managed objects) is maintained by the SNMP agent and used to
manage the device. These objects are defined in a Management
Information Base (MIB), which provides a standard presentation of
the information controlled by the on-board SNMP agent. SNMP
defines both the format of the MIB specifications and the protocol
used to access this information over the network.
The DES-2108 supports the SNMP versions 1. In SNMP v.1, user
authentication is accomplished using 'community strings', which
function like passwords. The remote user SNMP application and the
Switch SNMP must use the same community string. SNMP packets
from any station that has not been authenticated are ignored (dropped).
The default community strings for the Switch used for SNMP v.1
management access are:
public - Allows authorized management stations to retrieve MIB
objects.
private - Allows authorized management stations to retrieve and
modify MIB objects.
Traps
Traps are messages that alert network personnel of events that occur
on the Switch. The events can be as serious as a reboot (someone
accidentally turned OFF the Switch), or less serious like a port status
change. The Switch generates traps and sends them to the trap
recipient (or network manager). Typical traps include trap messages
for Device boot up, Authentication Failure, Port status change and
Abnormal transmit/receive data packet error.