[SNMP4J] Community String Indexing

[Damian A Starosielsky]

Frank,

Thanks for the quick reply.
I am trying your recommended approach but I am getting the following 
exception:


org.snmp4j.agent.DuplicateRegistrationException: 
org.snmp4j.agent.DefaultMOContextScope[context=public at 1,lowerBound=1.3.6.1.2.1.17.1.4.1,lowerIncluded=false,upperBound=1.3.6.1.2.1.17.1.4.2,upperIncluded=false]
    at org.snmp4j.agent.DefaultMOServer.register(DefaultMOServer.java:154)
    at 
net.airdefense.simulator.snmp.Simulator.populateDot1dBasePortTable(Simulator.java:116)
    at 
net.airdefense.simulator.snmp.Simulator.registerManagedObjects(Simulator.java:126)
    at org.snmp4j.agent.BaseAgent.registerSnmpMIBs(BaseAgent.java:179)
    at 
net.airdefense.simulator.snmp.Simulator.registerSnmpMIBs(Simulator.java:280)
    at org.snmp4j.agent.BaseAgent.init(BaseAgent.java:160)
    at net.airdefense.simulator.snmp.Simulator.main(Simulator.java:295)

Could it be that the isOverlapping() method called from ManagedObject.lookup
is not context aware?

Thanks,
Damian

Frank Fock wrote:

> Hi Damian,
>
> Yes, what you call "community indexing" is supported
> by SNMP4J-Agent. The concept is called "contexts"
> here. This concept has been introduced in SNMPv3,
> but you can also use communities to map on contexts.
>
> The mapping is defined in the SNMP-COMMUNITY-MIB
> which is provided/implemented by SNMP4J-Agent.
> In the agent, you simply register one DefaultMOTable
> with context "public", one with context "public at 1"
> etc. Then simply map an equally named community to
> these contexts and you are done.
>
> Best regards,
> Frank
>
> Damian A Starosielsky wrote:
>
>> I am using snmp4j-agent to implement a Cisco switch simulator.
>>
>> I am particularly interested in the dot1dTpFdbTable.
>>
>> The problem is that I need to simulate what Cisco calls "Community 
>> String Indexing".
>> What is means, is that each VLAN in the switch corresponds to a 
>> different
>> agent instance, listening on the same UDP port, but responding based 
>> on which community you use.
>>
>> Example:
>>
>> community: public -> dot1dTpFdbTable will have the MACs of the 
>> default VLAN
>> community: public at 1 -> dot1dTpFdbTable will have the MACs of VLAN 1
>> community: public at 55 -> dot1dTpFdbTable will have the MACs of VLAN 55
>>
>> Is this supported in the snmp4j library? How should I approach this 
>> problem?
>>
>> More details on community string indexing can be found in:
>>
>> http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00801c9199.shtml 
>>
>>
>> Thanks!
>> Damian
>>
>>
>>
>>
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>
>