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10 CHAPTER 1: OVERVIEW
Figure 1 shows the typical upgrade process.
Figure 1 Upgrade Process
How the Utilities Work The software on your bridge/router or switch consists of a bootable image file and
configuration files that store all your settings. The Enterprise OS Upgrade
Management Utilities update all your software files after copying them to a UNIX
or Windows NMS. Because the upgrade occurs on a copy of the files on the NMS,
the bridge/router remains operational during the upgrade. The utilities then copy
the new image and updated files back to the bridge/router.
Primary, Secondary, and Test Boot Sources
The NETBuilder bridge/router or PathBuilder switch boots from a default directory,
called the primary boot source, which can be set using the SysconF command in
the Enterprise OS user interface. If you have more than one set of boot images,
you can specify a backup directory, called the secondary boot source. There is also
a test boot source, which the utilities use to test a new upgrade before making it
the primary boot source. Because the boot sources are only pointers to particular
directories, the utilities can dynamically change the boot sources without having
to move any files.
Automatic or Manual Recovery
If your switch or bridge/router has enough flash memory, you can have both sets
of software: the old version and the new version. After a successful test boot with
the new software, the primary boot source is changed to the new version. If the
test boot is not successful, the system automatically reboots with the old version.
Dual-image support is described in the procedures for automatic recovery.
If you have only enough flash memory for the new version, you can still recover
the old version from the NMS using the utilities. Single-image support is described
in the procedures for manual recovery.
For memory requirements for automatic or manual recovery, see Chapter 3.
Perform
hardware
upgrade
Verify
upgrade
Do final cleanup
Accept
upgrade?
Reboot bridge/router,
test software images
and config files
Install software
and utilities
on NMS*
Yes
Yes
No
Reject
No
Back up config
and boot files
from bridge/router
to NMS
Update
config files
Is hardware
upgrade
required?
Restore old
software
version
If hardware
upgrade, reinstall
old hardware
Begin
Done!
?
?
Reset IP
config and
SNMP
Copy config
and boot files
to bridge/router
*NMS = network management station