Downgrading Your Cisco Mds San-Os Software Image - Cisco SN6000C Release Note

S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
If you are upgrading from Cisco MDS SAN-OS Release 3.1(1) to Cisco NX-OS Release 4.2(1b) before
upgrading to NX-OS Release 5.0(4b) on a Cisco MDS 9124 or MDS 9134 Switch, follow these
guidelines:
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Performing a Disruptive Upgrade on an MDS 9000 Family Switch
If you do not follow the upgrade path when performing a disruptive upgrade on an MDS 9000 Family
switch, (for example, you upgrade directly from SAN-OS Release 2.1(2) or earlier version to NX-OS
Release 4.2(x)), the binary startup configuration is deleted because it is not compatible with the new
image, and the ASCII startup configuration file is applied when the switch comes up with the new
upgraded image. When the ASCII startup configuration file is applied, there may be errors. Because of
this, we recommend that you follow the nondisruptive upgrade path.
You cannot upgrade the software image on an MDS 9120 switch, an MDS 9140 switch, or an MDS 9216i
Note
switch to Cisco NX-OS Release 5.x. See
Release 5.0(4b).
Resetting SNMP Notifications
Following a software upgrade or downgrade, SNMP notifications will reset as follows:
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Use the snmp-server enable traps command to reenable your required SNMP notifications.

Downgrading Your Cisco MDS SAN-OS Software Image

This section lists the guidelines recommended for downgrading your Cisco MDS SAN-OS software
image and includes the following topics:
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OL-21012-04
During the upgrade, configuration is not allowed and the fabric is expected to be stable.
The Fabric Shortest Path First (FSPF) timers must be configured to the default value of 20 seconds;
otherwise, the nondisruptive upgrade is blocked to ensure that the maximum down time for the
control plane can be 80 seconds.
If there are any CFS commits in the fabric, the nondisruptive upgrade will fail.
If there is a zone server merge in progress in the fabric, the nondisruptive upgrade will fail.
If a service terminates the nondisruptive upgrade, the show install all failure-reason command can
display the reason that the nondisruptive upgrade cannot proceed.
If there is not enough memory in the system to load the new images, the upgrade will be made
disruptive due to insufficient resources and the user will be notified in the compatibility table.
When you upgrade from SAN-OS Release 3.x to NX-OS Release 4.1(x), and then to NX-OS Release
5.x, SNMP notifications will reset to their default settings.
When you upgrade from SAN-OS Release 3.x to NX-OS Release 4.2(x), and then to NX-OS Release
5.x, SNMP notifications will not reset to their default settings.
When you downgrade from any NX-OS Release 4.2(x), SNMP notifications will reset to their
default configuration settings.
General Downgrading Guidelines, page 22
Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(4b)
Downgrading Your Cisco MDS SAN-OS Software Image
Table 3 for the list of switches that support Cisco NX-OS
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