[c-nsp] 3750-E + CVR-X2-SFP10G + SFP-10G-SR = disappearing media

[Matthew White (MAWHI)]

> -----Original Message-----
> From: Holemans Wim [mailto:wim.holemans at ua.ac.be] 
> Sent: 10 May, 2010 23:13
> To: Matthew White (MAWHI); cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] 3750-E + CVR-X2-SFP10G + SFP-10G-SR = 
> disappearing media
> 
> We have a similar setup but with X2 interfaces, so no X2 to 
> SFP+ convertors and that works just fine. Have you checked 
> the transceiver parameters ?

Hi Wim,

Thanks for your reply.

It appears that all of the values are withing normal operating parameters:

#show int ten2/0/2 trans det
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.
++ : high alarm, +  : high warning, -  : low warning, -- : low alarm.
A2D readouts (if they differ), are reported in parentheses.
The threshold values are calibrated.

                              High Alarm  High Warn  Low Warn   Low Alarm
          Temperature         Threshold   Threshold  Threshold  Threshold
Port       (Celsius)          (Celsius)   (Celsius)  (Celsius)  (Celsius)
--------- ------------------  ----------  ---------  ---------  ---------
Te2/0/2     44.2                75.0        70.0         0.0       -5.0

                              High Alarm  High Warn  Low Warn   Low Alarm
           Voltage            Threshold   Threshold  Threshold  Threshold
Port       (Volts)            (Volts)     (Volts)    (Volts)    (Volts)
---------  ---------------    ----------  ---------  ---------  ---------
Te2/0/2    3.29                  3.63        3.46        3.13       2.97

           Optical            High Alarm  High Warn  Low Warn   Low Alarm
           Transmit Power     Threshold   Threshold  Threshold  Threshold
Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)
---------  -----------------  ----------  ---------  ---------  ---------
Te2/0/2     -2.5                 1.7        -1.3        -7.3      -11.3

           Optical            High Alarm  High Warn  Low Warn   Low Alarm
           Receive Power      Threshold   Threshold  Threshold  Threshold
Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)
-------    -----------------  ----------  ---------  ---------  ---------
Te2/0/2     -2.9                 2.0        -1.0        -9.9      -13.9




> Maybe they are not within limit causing a shutdown of the 
> interface ? (temperature, input power, output power). The 
> first batch of (non-cisco) X2 transceivers we got, all gave 
> wrong information about thresholds e.d. After replacing them, 
> everything was fine.
> sh int te1/0/1 transc detail
> should give you this info. We are running version 122-50.SE2.
> 
> Wim Holemans
> Network/Security Manager
> University of Antwerp
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of 
> Matthew White (MAWHI)
> Sent: dinsdag 11 mei 2010 0:03
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] 3750-E + CVR-X2-SFP10G + SFP-10G-SR = 
> disappearing media
> 
> Greetings,
> 
> I have an open TAC case about this but I figured I'd ask here as well.
> 
> I recently installed 10 3750-Es in 5 2-member stacks. Each 
> stack has 2 uplinks to a 6509-VSS. I'm using X2 to SFP+ 
> converters and 10G SFP+ modules on both ends of the links 
> between the stacks and the VSS. In each stack I'm using 
> interface Ten1/0/1 and Ten2/0/1. There is currently no "real" 
> traffic on any of the links. The plan is to do a forklift 
> upgrade of our existing production network and I've set the 
> 3750/VSS up in a test environment. With the exception of two 
> hosts talking iperf to each other, the network is quiet.
> 
> The problem I'm seeing is this: after about 6 to 8 hours a 
> 10G interface on the 3750 side will go down. Saying 'show int 
> Ten2/0/1' will show the media type as "Not Present":
> 
> Full-duplex, 10Gb/s, link type is auto, media type is Not Present
> 
> as opposed to:
> 
> Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-SR
> 
> I am seeing this behavior on three individual switches and in 
> each case it is ten2/0/1 that fails. I've replaced the X2 
> converter, the SFP+ module and moved the converter to 
> Ten2/0/2 but the symptoms persist. I RMA'd one of the 
> switches and just installed the replacement, hopefully this 
> will solve the problem.
> 
> I also checked software compatibilty and the switches are 
> running (C3750E-UNIVERSALK9-M), Version 12.2(53)SE2
> 
> Has anyone seen this before?
> 
> -mtw
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