Nortel Networks 4050 Software Management menu includes the following options, Activate version

Chapter 14 Maintaining and managing the system 735

The Software Management menu includes the following options:

/boot/software followed by:

cur	Displays the status of the software versions on the
	particular device to which are connected. The status
	options are:
	• permanent — the software version that is
	currently operational
	• old — the software version that preceded the
	currently operational software version
	• unpacked — the software upgrade package has
	been downloaded but not yet activated
	If you activate a software version indicated as either
	unpacked or old, the status of that version is
	propagated to permanent . The software status
	change occurs after the Nortel SNAS 4050 device
	performs a reboot.
activate <version>	Activates a downloaded software upgrade package that
	the cur command indicates as unpacked. If serious
	problems occur when the new software version runs,
	you can switch back to the previous version by
	activating the software version that the cur command
	indicates as old.
	The Nortel SNAS 4050 reboots when you confirm the
	activate command.
	Note: When you activate a software upgrade on a
	Nortel SNAS 4050 device, all the Nortel SNAS 4050
	devices in the cluster reboot. All active sessions are
	lost.

Nortel Secure Network Access Switch 4050 User Guide