RE: passing context to MIB library

Hi Dave,

Thanks for quick reply.
If you refer  function set_snmp_log_params  in file third-party/src/snmp/net-snmp-5.1/agent/snmp_agent.c

           if (asp->orig_pdu->community) {
                for (i=0;i<asp->orig_pdu->community_len;i++) {
                   if (asp->orig_pdu->community[i] == '@') {
                        if (asp->orig_pdu->community_len > i+1) {
                           memcpy(and_context_name,&asp->orig_pdu->community[i+1], ((asp->orig_pdu->community_len)-i));
                            and_context_name_len =
                                ((asp->orig_pdu->community_len)-(i+1));
                 curr_ctx_entry_p = snmp_get_context_map_entry(


As seen in above code snippet from that function. It is separating a string after "@" and saves it as and_context_name .
I wanted to know how it passes this and_context_name to the get_dot1dTpFdbTable function ?

I have iterated through the net-snmp agent code many times but couldn't figure out how this context gets passed. Would greatly appreciate your help here

Thanks and Regards
Pranali

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave Shield
Sent: Thursday, July 23, 2009 12:54 AM
To: Pranali Hande (phande)
Cc: [email protected]
Subject: Re: passing context to MIB library

2009/7/22 Pranali Hande (phande) <[email protected]>:
> snmptable -M +. -m all -v 2c -c public@vlan3  172.23.231.28 dot1dTpFdbTable

That is sending a community-based request, using the community string
   "public@vlan3"

This has no connection with contexts, which are primarily an SNMPv3 concept.

There may be SNMP agents that use this syntax to specify contexts for
community-based requests, but the Net-SNMP agent isn't one of them (AFAIK).
It's certainly not part of the SNMP protocol.

Dave

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