ACE Module SNMP limits

Question

I am monitoring an ACE module using snmp. The values returned from certain OIDs are graphed using Cacti. I found the 64 bit counters on interfaces for the ACE wrap at 10,000,000,000 instead of 2^64. Now that I have configured cacti to expect the wrap at 10 billion, I am concerned about the 32 bit counters. I am querying this snmp oid to get L7 connection counter
cslbxStatsL7PolicyConns
1.3.6.1.4.1.9.9.254.1.1.1.1.8
Should I expect this counter to wrap at 2^32 or a lower value?

Answer 1

The maximum value for a 32bit OID should be 4294967296, I do have a value in my lab that is above 1 billion for that counter, so I wouldn't think there is an issue immediately. One common issue - when you clear stats manually, the counter will reset to 0. As well, I found an internal bug that that suggested some pocket case within the code could have cleared stats incorrectly, but it has never been seen since. There is a guess that someone logged into the test bed and cleared it without permission, but it was not able to be verified. Hence the bug was created to investigate the code, turned up nothing, and was junked accordingly.
What you might want to do is keep a sharp eye on the counter. When it looks like it rolls, login to the context you are polling and take a look at the accounting log. If you find that someone cleared the logging, that answers the question. If not - log a TAC case and we can replicate your exact configuration/code version in our lab to see if there what the deviation is that causes it to clear. A bug would be logged and fixed.
Regards,
Chris Higgins