Re: [Devmon] T or even P bits speed output in 'home made'-cisco-n7000 switch template

[W.J.M. N. <Wim...@nl...>]

Hello Peter,

> I cannot acknowledge wether there are network issues. So sorry, but several
> times (+/- 8 times a day) we experience the issue.
Do the graphs show a spike for all interfaces simultaneously (except for 
the ones which are not used)? If so, it looks like a reset of the counters 
within SNMP. You can minimise the impact of those resets by defining the 
dataset to be of type DERIVE rather than COUNTER. That should cause a 
negative spike, but as the lower limit is set to zero, this spike won't 
appear in the graph.

By using DERIVE, you will miss a measurement of the throughput if there is 
a real counter wrap. However, using 64-bit counters, this will not happen 
in your lifetime. (A 64-bit octet counter will wrap hen used on a 10 [Gb/s] 
interface transmitting at full speed after more than 460 years.) So the 
issue of counter-wraps can be ignored for 64-bit counters.

That should give you less stress in finding and solving the cause of those 
spikes.

>
> I see multiple devices with the query:
> [root@uhu-o cisco-n7000]# snmpwalk -v2c -c SECRET xxx.xxx.xxx.xxx
> .1.3.6.1.2.1.31.1.1.1.1
> IF-MIB::ifName.83886080 = STRING: mgmt0
> IF-MIB::ifName.335544320 = STRING: loopback0
> IF-MIB::ifName.385875968 = STRING: Null0
> IF-MIB::ifName.437256192 = STRING: Ethernet3/1
> IF-MIB::ifName.437260288 = STRING: Ethernet3/2
> IF-MIB::ifName.437264384 = STRING: Ethernet3/3
> IF-MIB::ifName.437268480 = STRING: Ethernet3/4
> IF-MIB::ifName.437272576 = STRING: Ethernet3/5
> IF-MIB::ifName.437276672 = STRING: Ethernet3/6
> IF-MIB::ifName.437280768 = STRING: Ethernet3/7
> IF-MIB::ifName.437284864 = STRING: Ethernet3/8
> IF-MIB::ifName.437780480 = STRING: Ethernet4/1
> IF-MIB::ifName.437784576 = STRING: Ethernet4/2
> IF-MIB::ifName.437788672 = STRING: Ethernet4/3
> IF-MIB::ifName.437792768 = STRING: Ethernet4/4
> IF-MIB::ifName.437796864 = STRING: Ethernet4/5
> IF-MIB::ifName.437800960 = STRING: Ethernet4/6
> IF-MIB::ifName.437805056 = STRING: Ethernet4/7
> IF-MIB::ifName.437809152 = STRING: Ethernet4/8
> IF-MIB::ifName.637534209 = STRING: Ethernet3/1
> IF-MIB::ifName.637534210 = STRING: Ethernet3/2
> IF-MIB::ifName.637534211 = STRING: Ethernet3/3
> IF-MIB::ifName.637534212 = STRING: Ethernet4/1
> IF-MIB::ifName.637534213 = STRING: Ethernet4/2
> IF-MIB::ifName.637534214 = STRING: Ethernet4/3
> IF-MIB::ifName.637534215 = STRING: Ethernet4/4
> IF-MIB::ifName.637534216 = STRING: Ethernet4/5
> IF-MIB::ifName.637534217 = STRING: Ethernet4/6
> IF-MIB::ifName.637534218 = STRING: Ethernet3/4
> IF-MIB::ifName.637534219 = STRING: Ethernet3/5
Very strange.  I wonder if there is a transform within Devmon which can 
remove the duplicates.

Regards,
   Wim Nelis.