ES10/ES26
Page 65/104
Document status: released
Operating Manual
rev. 01, 03.11.08
Trap Verify
If traps are to be transmitted via non permanent links like dial-up links (e.g. using ISDN or
standard analog modem), it is important to verify that the link to the trap receiver is working
before any SNMP traps are sent. Otherwise the traps could get lost.
Several settings have been introduced to obtain a verification of the link between the trap
transmitter (=NEC) and trap receiver:
•
Verify before trap
. If enabled, via SNMP Get Request the “sysDescr” OID of the host
having the “Trap Verify Receiver” IP address (see below) is executed before the pending
traps are sent. Only after successful reply all pending traps are sent. For permanent-on
links (e.g. LANs),
“disabled”
is the recommended setting. For other links
“enabled
” is the
recommended setting.
•
Trap verify receiver:
Here the IP address of the receiver, verifying the link, can be
entered. In many cases it might be one of the trap receiver addresses as entered in 0.
However, in dial-up links, optionally the IP address of a receiving modem (e.g. ISDN
router) could be used instead of the IP address of a real trap receiver.
•
Timeout:
A timeout time between 30 and 600 seconds might be specified, in order to
detect a link error. The NEC-E is waiting the specified time for replies on the “sysDescr”
SNMP Get Requests. After this time all pending traps are sent, regardless of a reply has
arrived or not. Important: In this case of timeout the ‘traps sent’ and the “traps discarded”
counter (see below) are incremented.
•
Trap Accumulation Time:
It is possible
to collect traps during the “
Trap accumulation
time”,
which can be set between 0 and 60 seconds,
until they are transmitted
ight ad e. This feature helps to reduce connection fees in dial up connections. In the
following cases the accumulated traps are in any case released for sending:
The internal trap memory is 3/4 filled.
The SNMP agent of the NEC-E is polled by any kind of manager.
•
Test “trap verify receiver” response:
This function is very useful to set up and test the
communication in modem links. By clicking this link it can be tested, whether the “Trap
Verify Receiver” is answering correctly on the SNMP Get Request. (Timeout after 30
seconds). This link is only visible, when “Verify before Trap” is enabled.
