Upgrade Protection From Release 9.3 To A Later Release; Procedure - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Appendix A Upgrade Information

Upgrade Protection From Release 9.3 to a Later Release

Release 9.3 includes an Upgrade Protection feature. This section provides guidelines on upgrades from
BPX switch software Release 9.3 to later releases.
Active statistics collection interferes with the software upgrade process. Prior to Release 9.3, you were
responsible for turning statistics off before beginning the software upgrade procedure.
The Upgrade Protection feature introduced in 9.3 protects you against the effects of failing to turn off
statistics. In 9.3, statistics collection is automatically turned off by the system when you enter the
loadrev 1 phase. In addition to statistics collected by Cisco WAN Manager, the local statistics collection
state machines are also disabled at this time.
Upgrade Protection applies only to "graceful upgrade," that is, upgrade to a standby controller card.
There is no change to the "non-graceful upgrade" procedure.
This feature is operational only when upgrading from release 9.3 to a later release. Upgrade from
Release 9.2 to 9.3 does not use this 9.3 feature. Upgrade Protection is used in intra-version upgrades,
such as an upgrade between 9.3.1 and 9.3.2
If you attempt to load an older release than the one currently running, you will be warned that
downgrades are not supported. You may override this warning and continue at your own risk. This
feature is meant to warn you early in case an invalid release is inadvertently loaded.
If you need to see certain statistics at this phase of the upgrade, you are allowed to restart state machines
one at a time. However, it is your responsibility to disable all these machines before entering the runrev
phase.

Procedure

The process of upgrading a network from one release of switch software to another involves several
phases:
Step 1 Load the new software image into the switches of the network by using
loadrev 1
Step 2 Upgrade the new image in standby controller cards (assuming graceful software upgrade) by using
upgrade
If you need to see certain statistics at this phase of the upgrade, you are allowed to restart state machines
one at a time. However, it is your responsibility to disable all these machines before entering the runrev
phase.
Run the new software revision, retaining the old revision and configuration for fallback protection, by
Step 3
using runrev
Step 4 Load the new revision into all controller cards in each node, purging all traces of the old revision, and
completing the upgrade. Use: loadrev 2
When you complete the upgrade by entering the loadrev 2 phase, the Upgrade Protection feature
re-enables all the statistics state machines that were active when upgrades were started. If CWM
statistics are desired, you must use CWM to restart collection.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Upgrade Protection From Release 9.3 to a Later Release
Cisco BPX 8600 Series Installation and Configuration
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