Juniper QFX3000-G QFabric, Deployment Manual, Page: 475 / 652

Upgrade groups enable two or more Node devices in a Node group, or an entire Node
group, to be rebooted at the same time. If you do not create an upgrade group, the Node
devices are upgraded one at a time. Before performing a nonstop upgrade on a Node
group, create an upgrade group and include the devices you want to reboot at the same
time.
NOTE:
• Upgrade groups work best when you build in redundancy so that not all
the Node devices within the Node group restart at the same time. We
suggest using the upgrade group feature for Node groups that have at least
2 pairs of Node devices (4 or more members), such as the network Node
group.
• If you add Node devices that have links to the same link aggregation group
(LAG), there might be traffic loss.
• Create the upgrade group by issuing the set chassis node-group node-group-name
nssu upgrade-group upgrade-group-name node-devices command at the
[edit chassis]
hierarchy.
For example:
user@qfabric# set chassis node-group NW-NG-0 nssu upgrade-group upgrade1 node-devices
[ node1 node2 ]
user@qfabric# set chassis node-group NW-NG-0 nssu upgrade-group upgrade2 node-devices
[ node3 node4 ]
Performing a Nonstop Software Upgrade on a Node Group
Supported Platforms
449 Copyright © 2015, Juniper Networks, Inc.
Chapter 20: Software Upgrade and Recovery