Re: OT: Transmit drops

Your Cisco Account team may be able to review the HP buffers and drop test
they perform against HP switches; part of their competitive teams. What I
saw when I looked at the tests, was a test where HP dropped packets with
only 2% utilization ... the HP shared memory across the ports is a poor one
model IMO when you are using all the ports. That particular test was w/
voice, video, and data and bursts. The HP switch could not protect the
voice. I would ask your Cisco team.

As Jay mentions, bursts happen on the msec level ... so it can be very hard
to catch.

I would suggest to check with your Cisco team about swapping out the HP for
a Cisco, and consider QoS for the important traffic (if possible). Perhaps
you can convince them to let you swap it out as some sort of trial or try
and buy' ... get creative and do not worry about asking for a trial...

HTH,
Andrew Lee Lissitz, CCIE 31840

.

On Thu, Mar 8, 2012 at 5:34 PM, Jay McMickle <jay.mcmickle_at_yahoo.com> wrote:

> Packet bursts, maybe?
> Do you have NetFlow turned on? A wireshark will show you millisecond
> spikes, as opposed to, NetFlow with 30second samples.
>
> Regards,
> Jay McMickle- CCNP,CCSP,CCDP
> Sent from iJay
>
> On Mar 8, 2012, at 12:05 PM, marc abel <marcabel_at_gmail.com> wrote:
>
> > I have an hp switch uplinked to a Cisco 4506R over 10GB ethernet. This
> link
> > averages about 600Mb of traffic but spikes up to around 1.5Gb. I've never
> > seen it spike over 2Gb per sec. The thing is this connection seems to
> have
> > a high number of transmit drops. Looking at the current statistics on the
> > interface statistics I see 3.5 Billion total frames with 440 million
> > transmit drops so over 10%. Why would an interface that is never maxed
> seem
> > to be dropping so many packets?
> >
> > I don't see any errors that would make me suspect a bad cable or
> anything,
> > no FCS runts, giants, or collisions.
> >
> > There is no queuing on this interface, would that help the situation?
> >
> > -Marc
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net