Thanks for all the replies!
Martin On 7/9/15, Robson, Alan <alan.rob...@viasat.com> wrote: > I have had a little experience building subagents with mib2c. > > mib2c will provide a skeleton of an agent/subagent and it's up to the > developer to fill in the implementation-specific details (from your example, > mib2c will make a stub function for you to fill in with a real > implementation of a function to read the fan state, mib2c has no way to know > how to read fan status but if you write a function to read the fan status, > mib2c will put in place everything that is needed to arrange for that > function to be called when a manager issues an SNMPGET on the OID for that > information). > > These are things done by a developer, not automatically by the agent. > > Also, the agent does not have to be created by mib2c, you can just write > one, it may be as easy as writing a script and telling snmpd to run it at > the appropriate time. > > Alan > > -----Original Message----- > From: Stuart Kendrick [mailto:stua...@alleninstitute.org] > Sent: Thursday, July 09, 2015 5:45 AM > To: Martin T > Cc: net-snmp-users@lists.sourceforge.net > Subject: RE: correlation of MIB files and MIB support on SNMP agents > > I don't know -- you are roaming past my expertise level here. I look > forward to hearing from someone more knowledgeable about this > process.--sk-----Original Message-----From: Martin T > [mailto:m4rtn...@gmail.com] Sent: Thursday, July 09, 2015 5:43 AMTo: Stuart > KendrickCc: net-snmp-users@lists.sourceforge.netSubject: Re: correlation of > MIB files and MIB support on SNMP agentsThanks! By "imagine that developers > instruct their SNMP agent to read the MIB file(s) and to implement what they > see there" you mean that they probably use mib2c or similar utility to > convert MIB files into C source code for SNMP agent?thanks,MartinOn 7/9/15, > Stuart Kendrick <stua...@alleninstitute.org> wrote:> I would imagine that > developers instruct their SNMP agent to read the > MIB> file(s) and to > implement what they see there. But I'm speculating.>> One could certainly > imagine that there is room for disconnects here! > I have occasionally > encountered agents which return values to a query > which aren't defined in > the MIB file, for example. [e.g. the MIB file > says that a query to a > variable can return integers from 1-5, each mapped to some state ...> but an > agent returns '0' or '6'.]>> --sk>> -----Original Message-----> From: Martin > T [mailto:m4rtn...@gmail.com]> Sent: Thursday, July 09, 2015 2:08 AM> To: > Stuart Kendrick> Cc: net-snmp-users@lists.sourceforge.net> Subject: Re: > correlation of MIB files and MIB support on SNMP agents>> One more question- > how properly vendors usually keep the MIB files and > MIB support on SNMP > agent in correlation? I mean are there sometimes > features listed in MIB > files which actually are not present in device > SNMP agent and the other > way around?>>> thanks,> Martin>> On 7/9/15, Martin T <m4rtn...@gmail.com> > wrote:>> Thanks for excellent answer!>>>>>> Martin>>>> On 7/8/15, Stuart > Kendrick <stua...@alleninstitute.org> wrote:>>> Yes, I understand the > relationship between SNMP agents & MIB files >>> in the way you and DPS > describe below.>>>>>> Rephrasing using my words:>>>>>> - Manufacturer > decides to support, say, monitoring fan state. Let's >>> take Cisco as an > example>>>>>> - Cisco writes the CISCO-ENVMON-MIB file, including an Object > Value >>> which returns the state of a given fan:>>>>>> ciscoEnvMonFanState > OBJECT-TYPE>>> SYNTAX CiscoEnvMonState>>> MAX-ACCESS > read-only>>> STATUS current>>> DESCRIPTION>>> > "The current state of the fan being instrumented.">>> ::= { > ciscoEnvMonFanStatusEntry 3 }>>>>>> - Developers use the definitions in that > MIB file to write code. I >>> suspect that implementations vary widely -- > one possible way to do>>> this:>>> (1) In the Cisco IOS, include support for > talking to the hardware in >>> order to report on fan state>>> (2) In the > Cisco CLI, include support for some sort of 'show fan state'>>> command>>> > (3) In the Cisco SNMP agent, include support for querying fan state>>>>>> - > Voila: an operating system which supports reporting on fan state >>> from > both the CLI and the SNMP agent.>>>>>> --sk>>>>>> -----Original > Message----->>> From: Martin T [mailto:m4rtn...@gmail.com]>>> Sent: > Wednesday, July 08, 2015 8:30 AM>>> To: > net-snmp-users@lists.sourceforge.net>>> Subject: correlation of MIB files > and MIB support on SNMP agents>>>>>> Hi,>>>>>> I read a product pamphlet > from DPS Telecom where they had following >>> Q&A>>> section:>>>>>> ----->>> > Q: I want to use a device feature that isn’t described in the MIB.>>> What > can I do?>>>>>> A: You can ask the vendor to extend the MIB to include this > feature.>>> DPS Telecom has extended its MIB to support client needs. But > you >>> need to understand that extending a MIB is actually a software >>> > development project.>>> The MIB is not just a text file. It’s also a > software interface >>> document to the embedded firmware of your SNMP > device.>>> Making additions to the MIB requires rewriting the device > firmware.>>> This is a serious project, involving writing code, debugging > it, and >>> undergoing a thorough quality assurance process.>>> ----->>>>>> > So am I correct that vendors like Cisco or Juniper develop their MIB >>> > files which are downloadable from their web-sites tightly with their >>> MIB > support on SNMP agents? In other words MIB files and MIB support >>> on SNMP > agents is closely correlated?>>>>>>>>> thanks,>>> Martin>>>>>> > -------------------------------------------------------------------->>> ->>> > --------- Don't Limit Your Business. 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Start Your Cloud Today.>>> > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.gigenetcloud.com_&d=AwIGaQ&c=jcv3orpCsv7C4ly8-ubDob57ycZ4jvhoYZNDBA06fPk&r=xN9AnMDZvO_QvUZQZcoply6WFqSJuNcpv-dDu2fA4Ac&m=0iZT6Jw1ya3Rv1wOK6aroblC39YJQJs-zXnUqWMyFYc&s=zktFRWVIVO-9bH400nliVkZrdzxJE3kPJoPT47v2Plw&e= >>>> _______________________________________________>>> Net-snmp-users > mailing list>>> Net-snmp-users@lists.sourceforge.net>>> Please see the > following page to unsubscribe or change other options:>>> > https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.sourceforge.net_lists_listinfo_net-2Dsnmp-2Dusers&d=AwIGaQ&c=jcv3orpCsv7C4ly8-ubDob57ycZ4jvhoYZNDBA06fPk&r=xN9AnMDZvO_QvUZQZcoply6WFqSJuNcpv-dDu2fA4Ac&m=0iZT6Jw1ya3Rv1wOK6aroblC39YJQJs-zXnUqWMyFYc&s=7K6piHgqtmtto2Z5muxf8Rl3FopSbVT1YgAItkyzZJA&e= >>>>>>>------------------------------------------------------------------------------ > Don't Limit Your Business. 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