RE: linkup linkdown monitoring impacts the performance

Hi
I read this mail and tried to run with the notification.c you mentioned .It
is generating the trap .But how to use netlink for this .We have to write
some code for opening the socket and what you mean by subscribe to link
change messages.I am not much familiar with this topic .Can you please put
some more light on this exactly how to implement this netlink concept in
net-snmp.

Thanks in advance .
regards
Vishakha

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Peder
Chr. Norgaard
Sent: Friday, February 24, 2006 3:00 PM
To: Dave Shield
Cc: [email protected]; [email protected]
Subject: Re: linkup linkdown monitoring impacts the performance


On Fri, 24 Feb 2006, Dave Shield wrote:

> On Fri, 2006-02-24 at 13:59 +0530, [email protected] wrote:
>
> > monitor  -r 5 -e linkUpTrap   "Generate linkUp" ifOperStatus != 2
> > monitor  -r 5 -e linkDownTrap "Generate linkDown" ifOperStatus == 2
>
> >      Since this set-up makes frequently so many system calls...
> > it affects the devices thruput rate.
>
> This is not too surprising, since you have instructed the agent
> to monitor the interfaces every 5 seconds.   This is significantly
> more frequently than the default configuration (every 10 minutes).
>
> Try increasing the delay between monitor probes to something more
> reasonable, or omit the "-r 5" options altogether.
>

The monitoring solution is inherently a terrible inefficient way of
generating data for what is basically an alarm:  you face an unholy choice
between heavy load even when everything is OK, and large delay in being
told that something is wrong.

If you work on a system with "netlink" support (a linux system, for
instance) and don't shrink from a bit of C coding you can make a solution
that gives the alarms immediately, and costs absolutely nothing on
run-time.  The trick is to open a netlink socket and subscribe to link
change messages.  Then generate the alarms using the net-snmp C API
interface.  There is an example in one of the tutorials, and it works, I
have tried it. 100-200 lines of code.

You can either put this code into the master SNMP agent or tack it on
from a separate process using the AGENT-X interface.

best regards

--
Peder Chr. Nørgaard        	Senior System Developer, M. Sc.
Ericsson Denmark A/S, Telebit Division
Skanderborgvej 232         	tel: +45 30 91 84 31
DK-8260 Viby J, Denmark         fax: +45 89 38 51 01
        e-mail: [email protected]
(old e-mail 2000-2003: [email protected])
         (old e-mail 1992-2000: [email protected])
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