[c-nsp] 6506 reporting incorrect vlan traffic stats via SNMP.

[Tassos Chatzithomaoglou]

Are you refering to vlan interfaces of physical interfaces?
We have this problem only on vlan interfaces on many L2/L3 platforms (3550, 3750, 6500/MSFC2).

Also 1" snmp polling would most probably "kill" our switches and i don't think it would change 
anything. A smaller polling interval could possibly help in situations where counters are wrapped 
twice between pollings because of very high traffic.

Tassos


R.L. Nevot wrote on 24/9/2006 12:11 πμ:
> We are performing snmp without problems, at least not noticed it.
> Have you did some test with a 'real time' snmp tool (1 second
> pooling?) like solarwinds or router ip console... ?
> 
> On 9/23/06, Tassos Chatzithomaoglou <achatz at forthnet.gr> wrote:
>> We have the same behaviour on all our L2/L3 switches and i think this is excactly what happens.
>>
>> Tassos
>>
>>
>> Dean Smith wrote on 23/9/2006 10:18 μμ:
>>>  > have set two graphing packages (Cacti & RTG) polling the vlan interfaces
>>> ever 30 seconds, and the correct traffic is simply not being reported.  For
>>> example, a vlan that typically has 5mbps inbound consistentally is only
>>> reporting 40kbps.
>>>
>>> I've seen this often in the past on my 6500s. I assumed the counters weren't
>>> picking up layer3 swithced traffic - and what I was seeing was actually only
>>> those packets being initially routed etc by the MSFC. Never proved it so I
>>> could be wrong.
>>>
>>> Dean
>>>
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