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

[Mack McBride]

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.
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] 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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