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Hierarchy Level


Configure parameters that affect the nonstop software upgrade (NSSU) process.


You use the request system software nonstop-upgrade command to initiate NSSU.

The rcp-count option (available only on QFX5100 switches) sets the number of parallel rcp sessions that NSSU uses to copy the new software to multiple Virtual Chassis or VCF member switches at a time.

The upgrade-group options define line-card upgrade groups for NSSU. When you initiate NSSU with at least one upgrade group configured, NSSU upgrades the line cards or Virtual Chassis or VCF members in each upgrade group to the new software version at the same time, in the order in which you configured them. Upgrade groups reduce the time required to complete an NSSU operation and control the order in which the line cards or members are upgraded.

Line-card upgrade groups are supported on some EX Series switches and EX Series Virtual Chassis that support NSSU and on a QFX5100 VCF.

These statements are all explained separately. You can also consult CLI Explorer.


If you do not configure rcp-count, NSSU uses a default algorithm to determine the number of parallel rcp sessions to use based on the number of members in the Virtual Chassis or VCF.

If you do not define any line-card upgrade groups, NSSU upgrades line cards or members of a Virtual Chassis or VCF one at a time in ascending order by slot or member number.

Required Privilege Level

interface—To view this statement in the configuration.interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 10.4.

rcp-count statement introduced in Junos OS Release 14.1X53-D40 for QFX5100 switches only.