Re: cache problems with table data mib2c

Dave Shield <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
On 16 June 2010 20:14, Kathy McLeod <[email protected]> wrote:
> Problem 2:  the -1 setting is not working for me for some of the commands.

"for some of the commands" is a bit vague.
Can you be more specific?

A test such as:
    $ snmpgetnext LLDP-MIB::lldpPortConfigAdminStatus ; \
       snmpgetnext LLDP-MIB::lldpPortConfigAdminStatus ; \
       snmpgetnext LLDP-MIB::lldpPortConfigAdminStatus ; \
       snmpgetnext LLDP-MIB::lldpPortConfigAdminStatus

works as expected:

LLDP-MIB::lldpPortConfigAdminStatus.5 = INTEGER: rxOnly(2)
LLDP-MIB::lldpPortConfigAdminStatus.9 = INTEGER: rxOnly(2)
LLDP-MIB::lldpPortConfigAdminStatus.13 = INTEGER: rxOnly(2)
LLDP-MIB::lldpPortConfigAdminStatus.17 = INTEGER: rxOnly(2)

showing that the cache is being reloaded for every request,
with the index values increasing automatically.


Now that index behaviour might well confuse a command that ends up
sending multiple SNMP requests (such as snmptable or snmpbulkwalk),
since the list of valid rows is changing under its feet.
   And a command such as "snmpwalk" (or "snmptable -CB") relies
on reaching the end of the table, and moving on the next one.  Which
will never happen in this case, so the command will run indefinitely.

But that's a consequence of the re-indexing in your dummy load command.
If you replace this with a fixed allocation
     "for(i=0; i<4; i++)"  instead of  "for(i=j; i<j+4; i++)"
            then everything should work OK.

Dave

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