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The 32-bit counters cause unexpected values on graphs


Core issue

Various counters in Simple Network Management Protocol (SNMP) are 32-bits wide. Once they reach the maximum value, they wrap to zero.

When a counter wraps, Network Management Software (NMS) applications display strange peaks or jumps in the graphs.

This is often seen in the interface statistics of high speed interfaces (gigabit Ethernet and higher).


To resolve this issue, instead of using the 32-bit counters, use the high capacity (64-bit) counters.

These counters will not wrap as quickly.

For example, instead of using the 32-bit ifTable, use the 64-bit ifXTable.

It’s not a good practice to poll a SNMP agent as frequently as even once every 10 or 30 seconds. 
It is recommended that the SNMP agent be polled every 5 minutes or so.

The only reason why anyone need to poll so frequently is when you use 32 bit counters to poll hi-speed interfaces (greater than 100 Mbps) 
since 32 bit counters roll over pretty quickly for high speed interfaces.
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