[c-nsp] Weird Multicast microburst amplification issue

Phil Mayers p.mayers at imperial.ac.uk
Sun Dec 11 06:23:01 EST 2011

On 12/09/2011 06:48 PM, Matthew Huff wrote:
> We have a multicast data stream (real-time ticker data) that by its
> nature is very bursty.
> When we connect a source server via gigabit Ethernet to our
> 6500/sup720 switch via a 6748 module and a destination server via
> gigabit to  the same or different module in the same switch,
> everything works fine. If the destination server is on a different
> switch connected by a layer3 10GB connection then we have significant
> output drops on the Ethernet connected to the destination server.
> All switches are 6509/sup720 with 6748 line cards. QoS is disabled
> globally. The servers are identical. The output drops only occur on
> the Ethernet drop connected to the server.

That's very peculiar.

Which 10g cards and IOS versions are you using?

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