ifInDiscards & ifOutDiscards
Faycal Bennani
Could someone tell me what do ifInDiscards & ifOutDiscards exactly mean
?
What kind of trafic should I send on a FastEthernet Switch to increase
these counters?
Thanks.
Faycal
Greg Barron
<366E8CDB...@InfRes.ENST.Fr>...
Why would you want to increase them? Don't these two counters mean that bad
things are happening so if they are always zero you have nothing to worry
about! Check out rfc2233 for the definition.
Cheers,
--
Greg Barron.
GBa...@tennyson.com.au
+61 3 95589964 (ph)
+61 3 95589965 (fx)
http://www.tennyson.com.au
Mohit Tendolkar
The network adapter (interface) discards frames if the network adapter
(interface) runs out of resources such as buffers for filtering the frames,
or some such BAD things. Now if"IN"Discards means the number of IN-coming
frames that have been discarded by that interface without passing it onto
the upper network layer for further processing...similarly if"OUT"Discards
implies data units that have arrived at the Data-link layer from the network
layer to be sent out on the wire..but due to resource limitations imposed on
the interface layer, it was unable to do so...ie the packet was discarded
without reaching the wire at all.
So theoretically, these should be zero. So you needn't try and "increase "
the value of these counters... :o)
Mohit
Faycal Bennani wrote in message <366E8CDB...@InfRes.ENST.Fr>...
>Hello,
>
>Could someone tell me what do ifInDiscards & ifOutDiscards exactly mean
>?
>
>What kind of trafic should I send on a FastEthernet Switch to increase
>these counters?
>
>Thanks.
>
>Faycal
Faycal Bennani
> Why would you want to increase them? Don't these two counters mean that bad
> things are happening so if they are always zero you have nothing to worry
> about! Check out rfc2233 for the definition.
well, my question is more related to the relability aspect of my
switch... before installing my network, I want to be sure that if
precisely those "bad things" realy occur, the counters will be increased
and indicate the correct value.
Faycal
Greg Barron
> Greg Barron wrote:
>
>
> well, my question is more related to the relability aspect of my
> switch... before installing my network, I want to be sure that if
> precisely those "bad things" realy occur, the counters will be increased
> and indicate the correct value.
>
In that case, all I can suggest is getting hold of a traffic generator of
some sort (it will probably need to be dedicated hardware such as DA30 etc,
I can't imagine a workstation pushing out enough traffic) and to generate
lots of traffic into your switch. You'd want to try varying packet sizes I
guess but in general small packets will be more likely to cause your device
to run out of resources and have to drop packets (ifInDiscards).
If this occurs then the fact that the device does not have enough resources
to handle the incomming packets *may* cause it to have to drop outgoing
packets (ifOutDiscards) but that would have to depend on the design of the
device.
If the device is 3rd party you could ask the developer if they have tested
the counters (they'd probably say yes no matter what, but a reputable
company would have test results I'd hope!) and if it is yours you could run
some test code to "randomly" cause a packet to be dropped.
That's about all I can think of. I hope it helps.
Cheers.
--
Greg Barron.
GBa...@tennyson.com.au
+61 3 95589964 (ph)
+61 3 95589965 (fx)
http://www.tennyson.com.au
> Faycal
>