Alex ,
Thank u very much for tht . But how do i pass the enterprise
variable (say hostname and ip address ) to my perl program and how do i
access it . i try to access it using command line arguments ( sth like
ARGV[0] ,ARGV[1] ) but tht attempt failed .
As of now iam redirecting my snmptrapd output ( using a format string ) to
a log file and reading the interface details from there using AWK to
determine the interface name . It works fine but iam sure we have a better
way of doing it !!!
can u pls suggest me how do we directly pass the arguments to my Perl
program ??
Thanx in advance
regards ,
rajasekaran C
Alex Burger
<[EMAIL PROTECTED]
rceforge.net> To
[EMAIL PROTECTED]
01/24/2005 11:03 cc
PM [EMAIL PROTECTED]
et
Subject
Re: Need help regarding
snmptrapd.conf
[EMAIL PROTECTED] wrote:
> hi friends ,
>
> Is it possible to send the name of the interface as an argument to the
> perl script we call in TRAPHANDLE command??
>
> I have something like this in my snmptrapd.conf file and it works fine .
>
> traphandle IF-MIB::linkDown /home/rchand/mail/sendmail.pl down
>
> But i also like to know which interface caused this trap as i recieve
traps
> from multiple interface...
The index of the interface is available in the trap and is passed to
your trap handler by snmptrapd. Snmptrapd passes the following to your
script:
hostname
ip address
uptime
trapname / OID
enterprise variables (one per line)
ip address from trap agent
trap community string
enterprise
The above are passed as variable name [space] variable value pairs,
except for the first two.
If you parse the enterprise variables, you will be able to find the
interface index number. You will then need to retrieve the actual
interface text name from the router or device using an snmpget in your
script.
For example, the following is a linkDown trap (using numeric OIDs -
snmptrapd was running with the -On switch).
router01
192.168.1.1
.1.3.6.1.2.1.1.3.0 31:18:27:02.00
.1.3.6.1.6.3.1.1.4.1.0 .1.3.6.1.6.3.1.1.5.3
.1.3.6.1.2.1.2.2.1.1.3 3
.1.3.6.1.2.1.2.2.1.7.3 2
.1.3.6.1.2.1.2.2.1.8.3 3
(Note: The above example is missing the ip address, community string
and enterprise which is usually the last three lines.)
You want to look at these three lines, which are the 'enterprise
variables':
.1.3.6.1.2.1.2.2.1.1.3 3
.1.3.6.1.2.1.2.2.1.7.3 2
.1.3.6.1.2.1.2.2.1.8.3 3
If you look in IF-MIB.txt, you will see under 'linkDown NOTIFICATION-TYPE':
OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
The three objects above are the three variables that are passed, which
you see above. ifIndex has a value of 3, ifAdminStatus is 2 and
ifOperStatus is 3.
If I had run snmptrapd without the -On, it would have been:
.
.
IF-MIB::ifIndex.3 3
IF-MIB::ifAdminStatus.3 2
IF-MIB::ifOperStatus.3 3
.
.
which is easier to read..
To get the name of the interface on a (Cisco) router for the above, you
would something like:
snmpget -v 1 -c public router01 .1.3.6.1.2.1.2.2.1.2.index
for example:
snmpget -v 1 -c public router01 .1.3.6.1.2.1.2.2.1.2.3
IF-MIB::ifDescr.1 = STRING: FastEthernet0/3
The tutorial should also help:
http://www.net-snmp.org/tutorial/tutorial-5/commands/snmptrap.html
Alex
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