NPM Discover behind Public VPN cloud

Question

Hello

Who can NPM (or Lansurveyor) discover devices behins a public VPN network cloud like IP_VPN or MPLS ?

HPOpenView NNM has a command line (loadhosts) to force discover such devices. Please advise.

NMS Server __(H/O Router1)...((( MPLS /VPN cloud ))) ... (Brch Router)

Thank you

kiwi · Answer

Hi Denny,

It would be suitable to instantly graph the performance of the NPM process that monitors the interfaces status both (ICPM when it pings the interface and the SNMP query to refresh its DB for an existing Dev / Interface). This will help trace how such process is performing and will guide us what is the smallest polling interval we can set without overloading the process operation and timely manner.

King regards

FormerMember · Answer

Q1- How to limit the discovery process based on OID or Vendor type ? for example default SNMP string for server is "public", which is the same for HP LAN printers. Now we do not want HP printer to get discovered. I do not want to delete them after discovery.

You can't block thiem from being discovered, but you can block them from being imported.  So you wouldn't need to delete.

Q2- In a largre network (SLX license type), how to make sure the network process that checks up/down interfaces is not behind schedule, i.e it's able to finish its check for all interfaces within one polling cycle ?

NPM can handle 7k-10k elements, depending on your hardware, what else is on the box, and your polling frequency.  You'll know it's overloaded if you start to see gaps in data.

kiwi · Answer

Denny Thanks for the reply.

Couple of more questions, in a large network:

Q1- How to limit the discovery process based on OID or Vendor type ? for example default SNMP string for server is "public", which is the same for HP LAN printers. Now we do not want HP printer to get discovered. I do not want to delete them after discovery.

Q2- In a largre network (SLX license type), how to make sure the network process that checks up/down interfaces is not behind schedule, i.e it's able to finish its check for all interfaces within one polling cycle ?

Thanks

kiwi