[widar-wg] Finished with B108-b-XX boards; test results; H/W faults found :-(

[James Robnett]

   That comes up when a board is switched from one rack to another but
only affects the 100mbit control interfaces and that switch fabric, the
mac/ip mapping is an issue since the switches are layer 2 and 3.

   For the gbit Blb output there's a separate switch fabric and it
only switches; no routing.  The only entries in the MAC address table
are the cbe-node input interfaces.  Those exist so the switch knows
which port to send the packets to since the only thing in the packet
headers was dst IP.

   That never applied to the output interfaces of the Blbs since switching
doesn't really care about src MAC.

   I don't see anything wrong at all at the moment.  I take it MCCC still
isn't getting packets from that Blb but is from others and we the cbe-nodes
are getting packets from that BlB.

James

> Right.  Now I think I remember...maybe it is at the switch end where the
> switch must ping the board...I recall James saying.
> Brent
>
> On 08/06/2011 4:54 PM, Brent Carlson wrote:
>> Ken,
>>
>> On 08/06/2011 4:25 PM, Ken Sowinski wrote:
>>
>>> On Wed, 8 Jun 2011, Brent Carlson wrote:
>>>
>>>
>>>> 5. Board b108-b-4 seems to have a transmit connection problem with the
>>>> CBE switch, probably due to a cabling fault, but could be anywhere
>>>> including traces on the PCB, or the SFP module itself.  The outgoing
>>>> packets are all addressed fine, but the CRM/mccc packet reader thing
>>>> fails to detect them, whereas it is fine for other boards.  The "SFP1"
>>>> LED in the GigE GUI is green, but this just means the receiver is
>>>> getting good signal and codes from the switch.  Can someone look at
>>>> the
>>>> switch port for b108-b-4?  If it is ok, then it is a b108-b-4 PCB
>>>> problem (because the SFP module can still put out good codes even if
>>>> the
>>>> signal into from the GigE FPGA is dead), if not it is a cabling or SFP
>>>> module problem.
>>>>
>>> I think that this is a CRM configuration problem.  Data from this
>>> board arrives happily at the CBE.  I learned last week that when
>>> baseline boards are swpped the CRM must "re-probe" the configuration;
>>> perhaps this was not done.
>>>
>> Hmmm....that would be nice if that were the case.  The board configured
>> ok, and all of the output packets had the right addresses...strange if
>> it now works!
>>
>> --Brent
>>
>>
>
> --
> Brent R. Carlson
> Brent.Carlson at nrc-cnrc.gc.ca
> Tel: 250-497-2346                  |  Fax: (250) 497-2355
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>
> "When and where humans are involved, mistakes inevitably happen"
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