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Important OSM/ESM Functions
2-10
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
2.8 Traps
Trap Messages
If certain events occur, the OSM/ESM can generate (SNMP) trap messages and
send them to up to 10 different nodes, for example management stations. By
configuring the management station, the traps can be displayed on the user
interface. An interpreted display is possible only when the corresponding MIB files
can be evaluated by the management station. For example, to obtain a plain
language display of special OSM/ESM functions, the private OSM/ESM MIB file
must be loaded (see Section 4.7.3).
Issuing Traps
If the trap function is activated, traps are issued by the OSM/ESM automatically in
the following situations:
Standard Traps (RFC 1157)
S After powering up or restarting.
S At link up, link down; in other words, when the valid connection to the DTE at a
port is interrupted or reestablished.
S If an SNMP authentication error occurs; in other words, when a network
management station or the Internet browser attempts to access the OSM/ESM
using SNMP requests with the wrong access permission (community name).
RMON Traps (RFC 1757)
S When certain limit values are violated (high, low) that were configured earlier on
the OSM/ESM by a network management station using RMON.
OSM/ESM-Specific Traps
S When the OSM/ESM ring is opened/closed by the redundancy manager
(OSM/ESM in the RM mode), see /1/.
S When there is a switchover between the standby master and standby slave in a
redundant coupling, see /1/.
S If the error state changes, see /1/.
S When one of the two power supplies of the OSM/ESM is turned on or off during
operation.
Enabling/Disabling Traps
The issuing of traps can be enabled or disabled by WBM or the command-line
interface.
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