[c-nsp] Fun problem affecting only even-numbered ports

[John Neiberger]

On Thu, Oct 28, 2010 at 10:10 AM, Tim Stevenson <tstevens at cisco.com> wrote:
> On the fiber (SFP) card, ports are indeed mapped in groups of 12 consecutive
> odd/12 consecutive even ports per rohini, with 24 odd ports on one janus &
> 24 even ports on the other.
>
> I'd guess you're just running out of replication bandwidth. A bit more
> detail about the traffic pattern etc would help. How many L3 replications
> are occurring here, and for what input rate? Ingress or egress replication?
>
> As a general rule you should spread the receivers as evenly as possible
> among odd & even ports to spread the replication load.
>
> Hope that helps,
> Tim

Tim,

We haven't been able to find any drops on the Janus or fabric for this
module. I'd have to tally up the total amount of traffic on this
blade, but my guess is that we're seeing close to 3 or 4 Gbps of
multicast video crossing through that module. I'll verify that later
and let you know.

John