Get a count of entries below an OID

[paulkoan]

We have a device that uses this OID:

1.3.6.1.2.1.4.35.1.4

This is where the arp cache is stored. Below this oid are entries like this:

iso.3.6.1.2.1.4.35.1.4.50.1.4.172.99.112.36 = Hex-STRING: 00 50 99 8F 14 99

Each one of these is an ARP entry, grouped by interface. The IP address forms part of the OID.

What I'd like to do is get a count of the entries below 1.3.6.1.2.1.4.35.1.4 - which will effectively give me the number of arp table entries for the device.

Is it possible to create an item that does a count of OIDs below a level?

[paulkoan]

I can probably get put together a script that sshes to the box and does a count of the arp entries, but I'd rather not introduce any additional moving parts if possible.