Switching

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 ....

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

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. 

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

Kudos are appreciated too! 

Regards, 

Sharat Ainapur

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.

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