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EX4600-EM-8F in Virtual Chassis

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  • 1.  EX4600-EM-8F in Virtual Chassis

    Posted 07-15-2020 00:20

    Bonjour,

    Before using the expansion cards in my virtual chassis ( 3 x EX4600), i search documentation on juniper sites .... I found a document quite short, saying the cards have hot swap capabilities and no particuliar warning.

    So I've inserted the cards (1 by switch) .... and the switches begin a reboot process stoping te full VC !

    Is this the correct behavior ? if yes this should be indicated in the docs ....

     



  • 2.  RE: EX4600-EM-8F in Virtual Chassis
    Best Answer

    Posted 07-15-2020 00:39

    Hi,

     

    Here is document for adding/removing the expansion cards.

     

    https://www.juniper.net/documentation/en_US/release-independent/junos/topics/topic-map/ex4600-maintaining-expansion-module.html

     

    However, there is a note mentioned as below:

     

    The EX4600 is configured for the QFX-EM-4Q by default, but any combination of the two modules is supported. Expansion modules can be hot-inserted or hot-removed. However, when an EX4600-EM-8F is inserted instead of the default QFX-EM-4Q, the PFE reboots and all of the interfaces on the switch and expansion module temporarily go down. Likewise when an EX4600-EM-8F is running on the EX4600 and it is swapped with a QFX-EM-4Q, all of the interfaces temporarily go down, which can cause a short disruption in traffic.

     

    Was this the case in your scenario ?

     

    If this solves your problem, please consider to mark this post as "Accepted Solution".

    Best Regards,

    Mohamed



  • 3.  RE: EX4600-EM-8F in Virtual Chassis

    Posted 07-15-2020 00:46

    Hi JL Oms, 

     

    Bonjour , 

     

    I checked our documentation and this is expected behaviour. 

    • The EX4600 is configured for the QFX-EM-4Q by default, but any combination of the two modules is supported. Expansion modules can be hot-inserted or hot-removed.
    • However, when an EX4600-EM-8F is inserted instead of the default QFX-EM-4Q, the PFE reboots and all of the interfaces on the switch and expansion module temporarily go down. 
    • Link : Installing an Expansion Module in an EX4600 Switch 

     

    Hope this helps. Smiley Happy

     

    Please mark "Accept as solution" if this answers your query. 

    Kudos are appreciated too! 

      

    Regards, 

    Sharat Ainapur



  • 4.  RE: EX4600-EM-8F in Virtual Chassis

     
    Posted 07-15-2020 01:15

    Hello JL,

     

    there is always a difference in what is supported and what is working correctly. Hot-swapping a module is such a case, it CAN and SHOULD work with supported platforms, but depending on the stability of the code, sometimes it just does not work.

     

    If you want to be safe, plan a maintenance window for this, halt the device, plug in the module(s) and reboot the device. This works all of the time.



  • 5.  RE: EX4600-EM-8F in Virtual Chassis

    Posted 07-15-2020 10:16

    Ok ... I have read too quickly the doc .... thanks for the answer.