Service request (los) signaling, 17560 – attention request (udp), Snmp – Thinklogical Router Interfaces User Manual
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Service Request (LOS) Signaling
Some VX, MX and HDX routers have an optional mode that can broadcast a message over the network
when a remote receiver requests attention. When enabled, the receiver will toggle its' TX pin, causing a
LOS (loss of signal) event to occur at the router. When detected, the router broadcasts an 'Attention
Request' message over the network. This message contains the IP address of the router and the port
number that detected the request. It is left up to an external system to detect, decode and act upon this
request.
17560 – Attention Request (UDP)
•
32-bits, router's primary IP address
•
16-bits, 0 for the Upper (or only) router chassis
1 for the Lower router chassis
•
16-bits, port number (list starts from 1, not 0)
•
16-bits, key code in bits 0 – 7, 0x00 and 0xff are ignored
Example:
c0 a8 0d 19 00 00 00 06 00 55
IP address = 192.168.13.25
Chassis = 0
Port number = 6
key code 85, 0x55
SNMP
The router can be monitored via SNMP. The MIB definition files can be downloaded from our ftp site and
are also located on the router in the directory
/usr/share/snmp/mibs/
. The SNMP program may
be configured by modifying the file
/etc/snmp/snmpd.conf
. Configuring SNMP is beyond the
scope of this document, but many excellent sites on the web exist that explain configuration. One such
site is:
There are a few entries in the SNMP configuration file that you may want to modify:
•
syslocation
Text to aid in locating the unit
•
syscontact
Name/Phone/email address of a contact
•
trap2sink
IP address/name of a system to receive SNMP traps
The default name used is 'snmp.trap' and is listed in
/etc/hosts
as pointing to 127.0.0.1. The easiest method to set
the trap address is to modify the
/etc/hosts
entry and not
change the trap2sink setting in the configuration file.
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