[j-nsp] Junos 12.3 more strict about 3rd party optics?

[Scott Granados]

Wow, peeks and pokes, I feel like I woke up in 1982 with an Apple 2E.:)
Good times.


On Jun 24, 2014, at 9:17 AM, Chuck Anderson <cra at WPI.EDU> wrote:

> On Wed, Jun 11, 2014 at 03:49:16PM +0100, Phil Mayers wrote:
>> On 11/06/14 15:01, Chuck Anderson wrote:
>> 
>>> Jun 10 11:40:54  ex4200 chassism[1293]: XCVR: Unit 0, SFP+ of type 0 EEPROM is Mis Programmed!!
>> 
>> Yeah, this was the one that caught my eye. I wonder if it's choking
>> on unknown values in the EEPROM.
> 
> After much investigation, and thanks to Juniper not locking down
> access to the internal debugging tools on JUNOS, I was able to
> determine that bytes 3-10 of the SFP ID EEPROM of optic I'm using are
> coded as all 0's.  My reading of the SFF-8472 MSA says that this is
> invalid:
> 
> "Transceiver Compliance Codes [Address A0h, Bytes 3-10]
> 
> The following bit significant indicators define the electronic or
> optical interfaces that are supported by the transceiver. At least one
> bit shall be set in this field."
> 
> The top half of byte 3 is defined as follows, and I would expect any
> MSA Ethernet optic to have at least one of these bits set, even
> CWDM/DWDM optics:
> 
> Byte	  Bit	 Description
> 3	  7	 10G Base-ER
> 3	  6	 10G Base-LRM
> 3	  5	 10G Base-LR
> 3	  4	 10G Base-SR
> 
> My optic vendor doesn't agree and says that those bits only refer to
> "grey" optics--standard wavelengths 850nm or 1310nm, and says that it
> is VALID to have no bits set all all in bytes 3-10.  I'm guessing that
> the SFP driver in EX4200 doesn't like this, but the one in MX doesn't
> care.
> 
> I tried changing the values using "xcvrpeek" and "xcvrpoke" (and
> "i2cpeek"/"i2cpoke").  Reads work fine, writes fail with -EIO in dmesg
> and the values don't change when read back.  I guess the optic is
> "locked" from writing changes to the EEPROM without some sort of OEM
> password or something.
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