[c-nsp] 6500 / 7600 output drops

[Colin Whittaker]

Hi All, 

We are seeing some very serious with output drops on our 6500 / 7600
platforms. We have sup720-3b with 6748 series lines cards, rj45 and sfp.

We have our IPTV headend connected via a single interface (int 1)  and is
producing 400 - 450 Mbit/sec of multicast traffic. 
We have a downstream network connected to a second interface (int 2)
that is watching all the tv channels at the same time and so all groups
are forwarded out int 2
With just multicast traffic flowing between two interfaces everthing works 
fine but as soon as we add any unicast traffic to the downstream network
which enters the 7600 via a different ingress interface we start to see
output drops on interface 2 and the associated problems in the video.

The unicast traffic is about 200Mbit/sec so the total traffic on the
link is 600Mbit/sec at 50kpps

Disabling QOS / giving the video queue the highest priority don't seem
to make a difference. 

Is there anything else I should try.

Colin
-- 
Colin Whittaker						+353 (0)86 8211 965
http://colin.netech.ie				   colin@(magnet|netech).ie