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])
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