Re: agent does not get called when registered at '.1'

On 04/01/2009 02:45 PM, Fulko Hew wrote:
>
> On Wed, Apr 1, 2009 at 2:26 PM, Mark Ellison <[email protected] 
> <mailto:[email protected]>> wrote:
>
>
>     On 04/01/2009 02:00 PM, Fulko Hew wrote:
>>     I've managed to get a lot farther in my universal agent/network
>>     simulator,
>>     but todays problem is:
>>
>>     "An agent registered at '.1' does not receive any requests,
>>     but agents registered at '.1.x' (and elsewhere) do receive requests"
>>
>>     For example: Lets say I query the agent with getNext
>>     ('1.3.6.1.2.1.1.1')
>>     And given the agent code:
>>
>>     my $regoid = new NetSNMP::OID('.1.3');
>>     $agent->register($0, $regoid, \&my_snmp_handler);
>>
>>     my agent receives the query, but...
>>     if I register my agent with the OID '.1'  instead (right at the
>>     top of the tree so I get _every_ request) my handler doesn't get
>>     called, but something inside the daemon does cause it to respond
>>     with 'noSuchName'.
>>
>>     Any clues?
>>     Is there something that says registering at the top of
>>     the OID tree is wrong, illegal, or a bug/feature?
>>
>     The shortest possible OID subtree is two subids in length.  If you
>     register '.1' it is likely you are really registering '.0.1'.  
>     (There are some funky rules about encoding the first subid in an OID.)
>
>
> OK.  I can live with that.  I just wanted to make sure _I_ wasn't 
> doing anything wrong.
>  
>
>     You will still get every request by registering '.1.3'. 
>     Everything published for SNMP object-types, etc. is under .1.3.6.1
>     anyway.  (See RFC 1065).
>
>
> Actually... In the course of  hunting down MIBs for stuff I've tripped 
> over,
> I have found the following from Cisco that fall outside of the normal 
> '1.3.6...' branch:
>
> IEEE8021-PAE-MIB     -    1.0.8802.1.1.1                also known 
> as:    iso.std.iso8802.ieee802dot1.ieee802dot1mibs.ieee8021paeMIB
> IEEE8023-LAG-MIB     -    1.2.840.10006.300.43    also known as:    
> iso.member-body.us.ieee802dot3.snmpmibs.lagMIB
You are doing some serious hunting.  Keep in mind that you can register 
multiple subtrees.  Here is a link to more information about the top 
level OID subtrees: http://www.alvestrand.no/objectid/top.html

Essentially, the first subid can be 0, 1 or 2.  I vaguely recall the 
second OID is limited to a range of 0..40.  Most of the top level 
subtrees are not used as a prefix for SMI definitions though.

Best of luck with your simulator effort!

Regards,

Mark
http://EllisonSoftware.com


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