Re: Packet loss when reaches 1Mb traffic

I agree 100%, ask them to clarify how they are doing the policing. They may
need to shape instead of policing for example.

CCIE # 23962

On Mar 11, 2010 10:04 AM, "Dale Shaw" <dale.shaw_at_gmail.com> wrote:

Hi Elbert,

On Thu, Mar 11, 2010 at 6:38 PM, Elbert Caibigan <xybert_gwapo_at_yahoo.com>
wrote: >

> I'm experiencing a problem (intermittent connection and choppy voice) with
our > client. Our clien...
I've seen lots of problems with carrier transmission equipment (e.g.
SDH) dropping packets between your L3 device and theirs. In my
experience, it's usually caused by relatively small buffers being
quickly filled up at the point of interconnect.

Does your NSP provide QoS on this service? If so, are markings
observed/honoured in the L2 network or only at L3? Do you know what
type of transmission network they have? How are they policing your
traffic? (i.e. which exact parameters are they using for things like
burst size or measurement interval and on what type of device?)

In one extreme case, we were losing ~6Mbps of traffic between the CE
and PE. Interfaces were running clean. Comparing the egress bitrate at
the CE and the ingress bitrate at the PE told a different story, as
did a packet sniffer.

You might find if you send a steady stream of traffic at 2,000,000bps,
it all makes it, but as soon as you throw in some bursty goodness, it
all goes to mud.

The moral of the story is you need to open a dialogue with your NSP
and push them really hard to prove that they're not losing your
traffic. Make sure your interface really is running clean (no drops,
overruns, CRC/alignment errors etc.) before pointing the finger at
them, though :-)

cheers,
Dale

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Received on Thu Mar 11 2010 - 10:09:37 ART