Catalyst 2960s: wrong value in ifHCOutOctets of 10Gbps ports
Hello! Sometimes my snmp monitorings gets strange value from ifHCOutOctets of 10Gbps ports (it happens randomly). Such value makes calculation of bps on port like through port gone away 150Gbps.. Calculation of bps (time between checks - 60s): evaluate value as (value-prev_value)/(time-prev_time), where value - current value value_prev - previously received value time - current timestamp prev_time - timestamp of previous value Value after calculation always ~150Gbps (it looks like counter's value was increased onto very big and unreal number). Switch: WS-C2960S-48TD-L with 15.2(1)E IOS (previous 15.0.2-SE5 had the same behaviour).
Is it known and resolved problem? I had try to find info about such problem, but without results.
>> Ideally devices takes longer than 10 seconds to update the SNMP ifTable/ifXTable objects. If the traffic related SNMP MIB objects of ifTable/ifXTable are polled aggressively, then the counters would not be updated, or sometime it may show incorrect details as well.
This should not affect most customers as it is considered one of the best practices to fetch the data over 3-5 minute poling intervals. This is considered a best practice as the data being fetched for performance monitoring and capacity planning, without impacting the performance.
>> There are certain know bugs on some of the platforms/IOS on the 10Gig ports, like :
CSCsd65958 Incorrect value for ifHCInOctets, ifHCOutOctets, ifHCInUcastPkts
CSCsw29555 ifHCInOctets and ifHCOutOctets increase abnormally
You can open a TAC case to confirm the bug ID you may be hitting and fix IOS versions.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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