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

[Tim Stevenson]

At 09:00 AM 10/28/2010, Mack McBride uttered:

>The 6748-SFP use one Rohini for even and one Rohini for odd ports 
>not consecutive, IIRC.
>This could vary by revision.  I don't have one handy to check against.
>The Janus and SSA are for ports 1-24 and 25-48.

It's even/odd all the way back to the fabric on the 6748-SFP, one 
janus/SSA handles odd ports, the other even ports.

Tim


>There are four Rohini on the board, two connected to each Janus/SSA pair.
>
>You can use 'sh int <port> cap | inc Ports" to list the ports.
>And 'sh asic slot <slot>" to list the asics.
>
>This is example output of a 6724 which is consecutive.
>
>#sh int Gi1/1 cap | inc Ports
>   Ports-in-ASIC (Sub-port ASIC) : 1-24 (1-12)
>
>The first port list is the Janus and SSA.  The second is the Rohini.
>
>#sh asic-version slot 1
>Module in slot 1 has 3 type(s) of ASICs
>         ASIC Name      Count      Version
>             JANUS          1      (1.0)
>               SSA          1      (9.0)
>            ROHINI          2      (1.5)
>
>Mack
>
>-----Original Message-----
>From: cisco-nsp-bounces at puck.nether.net 
>[<mailto:cisco-nsp-bounces at puck.nether.net>mailto:cisco-nsp-bounces at puck.nether.net] 
>On Behalf Of Benjamin Lovell
>Sent: Thursday, October 28, 2010 9:38 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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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Distinguished Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
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