Override IF-MIB::ifAlias.<x> Values from AgentX Sub-Agent

[David Hauck]

Hi,

I'd like to leverage the agent's "override" configuration directive to implement custom control of the IP-MIB::ifAlias values. The agent target has its own "aliases" for the standard interface names, for e.g., "Interface 1" might be an alias for "eth0". It's easy to hardcode this information in the agent's configuration file:

# IF-MIB::ifAlias.4
override override 1.3.6.1.2.1.31.1.1.1.18.4 octet_str "Interface 1"

The issue I'm having is how to dynamically determine the ifAlias instances and then to add these to the configuration file. Ideally, I'd like to determine this from my AgentX sub-agent that's running on the agent target, but I don't believe there's any equivalent to a programmatic get request from the sub to the master (i.e., to retrieve ifNumber and then to query the set of ifAlias.x values). Is this correct? I can't rely on running any of the client-based shell applications (snmpget, snmpwalk, etc.) on the target (to retrieve this information) as there may be no known MIB access available to these clients (i.e., no community based access and no access to any v3 user passphrases).

Of course I could try to mimic the heuristic that the master uses to enumerate the interfaces and construct the if[X]Table, but that seems like cheating (and also results in far too much coupling for my liking).

I'm hoping someone might have some ideas for how to do this?

Thanks,
-David


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