Re: Output Drops on Gig Interface

Can you paste the QoS config for the ports and the global config? Is there
a reason you have QoS enabled on the device, but aren't trusting anything?
You do know that when you don't trust that the box will rewrite the DSCP
value to 0 right?

On Wed, May 5, 2010 at 4:53 PM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> On Wed, May 5, 2010 at 20:36, naman sharma <naman.prep_at_gmail.com> wrote:
> > nope Kambiz i am based out of US..I understand that these drops are less
> but
> > as technical person i would like to know the reason of the drops. I am
> doing
> > some tests.. Will update the group with the status.
>
> Are they seeing the counter increase, or are they observing actual
> performance degradation? That's the important thing. Also, the counter
> increasing means nothing. The dropped packet, for all we know, could
> have dropped because the destination host was no longer present
> (dropped out of ARP table just before the packet was sent, but after
> it entered the queue - though I doubt this kind of verification is
> performed in the queue)... or any corner case like that. What you
> should keep an eye on is the RATE if failure, that is ratio of
> transmitted and dropped packets. There are dropped packets in *every*
> network. If the rate is below certain threshold (and this is almost
> 10x below it), that's about it.
>
> Now... of course, there is nothing to worry about, but there are
> multiple factors that can be causing this. For starters - have you
> checked the optics? Are those OK? Have you tried replacing them with
> different ones? What are the distances involved - could you be sending
> too strong signal (I see you are using LX SFPs and sometimes those
> lasers are too strong and could cause performance degradation on the
> receiver - you may need attenuators). Could it be too long and you may
> need to replace the optics with ZX? Finally... are you using
> Cisco-branded (bleh, those were the worst for me) optics or 3rd party
> - how reliable is your vendor?
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
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Received on Fri May 07 2010 - 08:12:59 ART