>From my experience... Any change of the mode on a protocol requires a reboot 
>of JunOS. Correct?

- Brian J.

Sent from my iPhone
Please excuse typos

> On Feb 20, 2018, at 5:59 AM, Ola Thoresen <o...@nytt.no> wrote:
> 
>> On 20. feb. 2018 11:10, Imran Kamal wrote:
>> Hi all,
>> 
>> Can anyone please confirm once I enable "IPv6 Flow mode", do I need to
>> reboot both SRX 58K boxes at the time or one after another?
>> 
>> The firewall cluster in production and we can't afford any outage window at
>> the moment
> 
> 
> 
> I have not tested it on 58k spcifically, but on other SRX-clusters, and you 
> need to reboot both nodes.
> 
> However, you can reboot them one after each other, and ensure that you 
> failover all redundancy groups gracefully between the reboots.
> 
> So I would suggest enabling IPv6 flow mode, then reboot the secondary node. 
> After it comes back up, failover all redundancy groups to the already 
> rebooted node. Then reboot the former primary node.
> 
> Then you can decide whether you want to fail back to the old primary again 
> after the second reboot.
> 
> But no matter what you do - I would do this in a service window. It SHOULD 
> work without any traffic interruptions, but better to be safe than sorry.
> 
> 
> /Ola (T)
> 
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