Downgrading Your Cisco Mds San-Os Software Image - Cisco AJ732A - MDS 9134 Fabric Switch 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 performing an upgrade on one of those switches, you should follow the nondisruptive upgrade
path shown in
ensures that the binary startup configuration remains intact.
If you do not follow the upgrade path, (for example, you upgrade directly from SAN-OS Release 2.1(2b)
to SAN-OS Release 3.2(1)), 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.

Downgrading Your Cisco MDS SAN-OS Software Image

This section lists the guidelines recommended for downgrading your Cisco MDS SAN-OS software
image and contains the following sections:
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General Downgrading Guidelines
Use the following guidelines to nondisruptively downgrade your Cisco MDS SAN-OS Release 3.2(1):
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OL-14116-01
Table 6, even though the upgrade is disruptive. Following the nondisruptive upgrade path
General Downgrading Guidelines, page 21
Downgrading the SSI Image on Your SSM, page 23
Install and configure dual supervisor modules.
Issue the system no acl-adjacency-sharing execute command to disable acl adjacency usage on
Generation 2 and Generation 1 modules. If this command fails, reduce the number of zones, IVR
zones, TE ports, or a combination of these in the system and issue the command again.
Disable all features not supported by the downgrade release. Use the show incompatibility system
downgrade-image CLI command to determine what you need to disable.
Layer 2 switching traffic is not disrupted when downgrading to Cisco SAN-OS Release 2.1(2) or
later.
Use the show install all impact downgrade-image CLI command to determine if your downgrade
will be nondisruptive.
Be aware that some features impact whether a downgrade is disruptive or nondisruptive:
Fibre Channel Ports: Traffic on Fibre Channel ports can be nondisruptively downgraded. See
–
Table 8 for the nondisruptive downgrade path for all SAN-OS releases.
– SSM: Intelligent services traffic on the SSM, such as SANTap, NASB, and FC write
acceleration, is disrupted during a downgrade. SSM Fibre Channel traffic is not.
– Gigabit Ethernet Ports: Traffic on Gigabit Ethernet ports is disrupted during a downgrade.
This includes IPS modules and the Gigabit Ethernet ports on the MPS-14/2 module. Those
nodes that are members of VSANs traversing an FCIP ISL are impacted, and a fabric
reconfiguration occurs. iSCSI initiators connected to the Gigabit Ethernet ports lose
connectivity to iSCSI targets while the downgrade is in progress.
iSCSI: If you are downgrading from SAN-OS version 3.0(x) to a lower version of SAN-OS,
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enable iSCSI if an IPS module or a MPS-14/2 module is online in the switch. Otherwise, the
downgrade will disrupt traffic.
Cisco MDS 9000 Family Release Notes for Cisco MDS SAN-OS Release 3.2(1)
Downgrading Your Cisco MDS SAN-OS Software Image
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