[c-nsp] CEF and multicast on a 3750

[John Neiberger]

On Tue, Jun 26, 2012 at 7:59 AM, Gert Doering <gert at greenie.muc.de> wrote:
> Hi,
>
> On Tue, Jun 26, 2012 at 06:55:41AM -0600, John Neiberger wrote:
>> > Odd. How intermittent? What's the traffic rate?
>>
>> We seem to start losing packets at around 250 Mbps of total multicast
>> traffic, as I recall. I'll double check when I get in to work.
>
> Bursty ingress from multiple sources?
>
> This could just be the "tiny buffer" syndrome... are you seeing output
> drops on the egress ports?
>
> gert

The sources are constant bit rate video sources, so they're not
bursty. We are not seeing output drops on most interfaces, but I just
noticed that we had a few thousand output discards on an interface
facing one of our monitoring devices. I'll need to figure that out
because it is our monitoring device that is reporting most of the
problems. We only have about 340 Mbps of traffic facing that probe,
though, so I have no idea why we'd be seeing output drops.

John