Ok - I see what you are saying - a getnext has to find the next instance for any given oid. So I guess having empty tables back to back is what is timely.
-----Original Message----- From: dave.shi...@gmail.com [mailto:dave.shi...@gmail.com] On Behalf Of Dave Shield Sent: Friday, October 19, 2012 2:22 PM To: Joan Landry Cc: net-snmp-users@lists.sourceforge.net Subject: Re: get-next question On 19 October 2012 18:50, Joan Landry <joan.lan...@overturenetworks.com> wrote: > When I walk a column in one table, and that table is empty I see that > net-snmp is calling handlers for tables that are next in the oid table > sequence. That is correct. > Is there a reason why net-snmp goes to the next table - when a next > was requested for a given column in one table. No - a GetNext request was issued for a given OID (which just happens to fall within a particular table). The defined behaviour of the GetNext request is that it will return the next valid instance that the agent supports. Not the next instance within a particular range or within the same table - the next valid instance. The agent is working as expected. The SNMP protocol has no idea about the logical structure of MIB information - that's why it can work even without MIB files being available. (That's also why "snmpwalk" will always issue one "extra" GetNext request, and discard the result) > This can take a long time to respond if the subsequent tables are also > empty. If a table is empty, then processing requests for it ought to be quick, surely? If that's taking a long time, then this is probably the thing to address. Dave This email and attachments may contain privileged or confidential information intended only for the addressee(s) indicated. The sender does not waive any of its rights, privileges or protections respecting this information. If you are not the named addressee, an employee, or agent responsible for sending this message to the named addressee (or this message was received by mistake), you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If received in error, please notify us immediately by e-mail, discard any paper copies and delete all electronic files of the email. Computer viruses can be transmitted via email. The recipient should check this email and any attachments for viruses. Email transmission cannot be guaranteed to be secured or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender accepts no liability for any damage caused by any transmitted viruses or errors or omissions in the contents of this message. Overture Networks, Inc. 637 Davis Drive, Morrisville, NC USA 27560 www.overturenetworks.com ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Net-snmp-users mailing list Net-snmp-users@lists.sourceforge.net Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
