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That's a ~~difficult question~~.

That's not easy to answer in general.

If there's an existing agent that already implements the desired new

MIB, then it makes sense to re-use that, via whatever extension protocol

that agent might support. Note that the SMUX protocol has essentially

been superceded by AgentX, which provides a fuller and more reliable

mechanism than either SMUX or proxied SNMP. So ideally, this would

be the preferred extension approach.

But if the target subagent only supports SMUX or basic SNMP, then that

would dictate the extension protocol to use.

Implementing the module in C within the main agent (directly or via

dlmod) is probably the most efficient and reliable, closely followed

by embedded perl (or python) extensions. These have the advantage of

minimal overheads between the code implementing the MIB module, and

the agent framework, and no inter-process communication issues. But

this does assume that there's a suitable mechanism for retrieving the

necessary information.

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