Switching

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Ask questions and share experiences about EX and QFX portfolios and all switching solutions across your data center, campus, and branch locations.

  • 1.  0mW Laser output power from one of EX4500 port

    Posted 09-25-2011 08:29

    Hi,

     

    I have a 10GE long haul link running between 2 cities and they are terminated on EX4500 switches running 10.3R2.11 code. For past couple of weeks, the link going down very often. When I was checking the port of one of my EX4500 switch where the link is terminating, I see zero mW laser power output as shown below. Anyone noticed this issue before and what could be the problem?. I changed the SFP+ (NonJuniper LR optic) and also moved the link to another xe-0/0/xx port on the switch but that doesn't help.

     

    -------------------------------

    user@city2> show interfaces diagnostics optics xe-0/0/22
    Physical interface: xe-0/0/22
        Laser bias current                        :  39.000 mA
        Laser output power                        :  0.0000 mW / - Inf dBm
        Module temperature                        :  30 degrees C / 86 degrees F
        Module voltage                            :  3.3120 V
        Receiver signal average optical power     :  0.2090 mW / -6.80 dBm
        Laser bias current high alarm             :  Off
        Laser bias current low alarm              :  Off
        Laser bias current high warning           :  Off
        Laser bias current low warning            :  Off
        Laser output power high alarm             :  Off
        Laser output power low alarm              :  On
        Laser output power high warning           :  Off
        Laser output power low warning            :  On
        Module temperature high alarm             :  Off
    :

    :

    :

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    Appreciate any feedback. Thanks.



  • 2.  RE: 0mW Laser output power from one of EX4500 port

    Posted 09-26-2011 07:08

    I dont think the diagnotic commands will work properly on all NON-JNRP optics therefore you probably can't take the results as legit information.  I have some 3rd party optic that don't give me any information at all and others that give me everything.... 

     

     



  • 3.  RE: 0mW Laser output power from one of EX4500 port

    Posted 09-26-2011 08:06

    Let me try replacing it with "juniper" branded LR optic (cost $2000 for one piece) and see if that help.



  • 4.  RE: 0mW Laser output power from one of EX4500 port

    Posted 09-26-2011 13:51

    Actually, it is not the SFP+ or switch problem. Seems like some issue at the ISP end. I will more post more when I have full detail.



  • 5.  RE: 0mW Laser output power from one of EX4500 port
    Best Answer

    Posted 12-27-2011 23:46

    I replaced non-juniper LR optic with juniper branded and also upgraded the junos to 10.4R5.5 a month back. No issues since then.