Custom SNMP monitors

I'm not sure if this is the right place or not... But I'm looking to write a special SNMP monitor that will poll the load balanced server on a partiular OID. Can anyone help?

 

 

Here's what we are trying to accomplish:

 

 

We are load balancing to SSL VPN gateways with GTMs and LTMs. We want the F5s to make decisions based on the USER count that the SSL boxes are seeing. We believe this is at the LTM level at this point. Each SSL box can handle 2000 concurrent users. So what we want to do is, when one box is hitting 2000, we want it to drop out of the pool, and only then. When it's count goes back down, bring it back in. So we can't base it on the "connection limit" setting because that is purely TCP sessions, of which each user will have multiple (VPN tunnels, apps, etc). So we're not really worried about persistence, we have IP persistence turned on. But our customer wants to load balance based on these user counts. We have a MIB from the SSL boxes that provides the concurrent user count, we just don't know how to set up a custom SNMP monitor to pull that from each box.

 

 

So when we go to the custom SNMP_DCA_Base monitor, we need to know what to put in each field that corresponds to the MIB. So OID is ".1.3.6.1.4.1.12532.12", where do we put that? Here's the MIB output from the box itself:

 

 

iveConcurrentUsers OBJECT-TYPE

 

SYNTAX Counter32

 

MAX-ACCESS read-only

 

STATUS current

 

DESCRIPTION

 

"The Total number of Users Logged In for the IVE Node"

 

::= { juniper-ive 12 }

 

 

So how do we make that work for us? On the custom page, there's just the fields that say "Name" and "Variable". So we don't really know how to put it all together...

 

 

Thanks in Advance!