Technical data

6.6 SNMP Settings 129
6.6 SNMP Settings
SNMP is short for Simple Network Management Protocol . This
protocol provides functionalities for controlling and monitoring
a network. It responds to specific incidents such as errors and
notifies the administrator in an appropriate way.
To use SNMP an additional software is necessary. Here you can
enable agent and traps only.
All devices monitored have to have an agent. These agents will
send in regular intervals, on request or triggered by events data.
The structure of this data is defined in MIBs.
The SNMP community provides a simple access protection by
creating a community named public with the right “Read Only”.
A second community, named admin possesses the right “Read
Write”, i.e. members of this community can edit the settings.
Via the community string a SNMP manager discloses his af-
filiation to a certain community. Unfortunately this string is
transmitted as plaintext, making the security vulnerable.
A trap is sent each time an event happens. A trap message
contains among other things the TrapID. There are 7 different
trap IDs (see below).
The message consists among other things of the common TrapID.
7 common TrapIDs are defined:
TrapID Explanation
1. Cold boot The device had to do a cold reboot.
2. Warm boot The device had to do a warm reboot.
3. Link Down No connection to device.
4. Link Up Connection to device.
5. Authentication Error No authentication due to an error.
6. EGP neighbor lost No connection to another router in the LAN. (EGP
is short for Exterior Gateway Protocol. This pro-
tocol is used to exchange information about the
accessibility between two routers in stand-alone
systems.)
7. internal information Internal information; depends on manufacturer.
Table 6.3: SNMP TrapIDs