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

[Jim Getker (getker)]

Actually on this card one Janus handles the even ports, and the other
handles the odd ports.

Jim

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Ben Lovell
(belovell)
Sent: Thursday, October 28, 2010 11:38 AM
To: John Neiberger
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Fun problem affecting only even-numbered ports

Nothing that I can think of. One Super Santa Anna and Janus run ports  
1-24 and another pair of them run ports 25-48. One Rohini runs each  
consecutive group of 12 ports. The only thing I could guess at is the  
path take across the switchbar fabric but I don't recall how we select  
FPOE right now.

-Ben

On Oct 27, 2010, at 12:54 PM, John Neiberger wrote:

> This is a good one. I'm working with TAC on it, but I thought i'd
> share it here, too, just because it's so unusual. We're seeing
> intermittent drops on a multicast video stream and we haven't been
> able to determine why. This is the second time we've seen this bizarre
> behavior. At the urging of the TAC engineer, we tried moving receivers
> to different ports and noticed that we only see the drops when the
> receiver is connected to even-numbered interfaces! Odd-numbered
> interfaces are not affected.
>
> This is on a 7600 with SUP 720-3BXL and a 6748 linecard. What part of
> the 6748 linecard architecture is responsible for a behavior
> difference between odd- and even-numbered ports? This is a WS-6748-SFP
> with a DFC-3BXL.
>
> Any thoughts?
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