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I am responsible for a project conducting a major code upgrade on our core/aggregation and distribution layer switches along with our ISP routers.

We run all Juniper Routers and switches minus a few stray Arista switches used for aggregation.

Ive already done most of the keg work, and research on the actual processes involved in this but my question is this.

When I cut over to my secondary routing engine on the MX80s which will be our first portion of the project, should I expect to see any sort of packet loss or service interruption? I am aware that making the secondary RE is supposed to avert this, however this will be my first major upgrade in a large production environment.

Thanks

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Ty,

check out ISSU options on the code version you have on the MX's

http://www.juniper.net/documentation/en_US/junos14.2/topics/reference/requirements/issu-system-requirements.html

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