Cisco AJ732A - MDS 9134 Fabric Switch Release Note page 18

Downgrading Your Cisco MDS SAN-OS Software Image
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 .
General Downgrading Guidelines
Use the following guidelines to nondisruptively downgrade your Cisco MDS SAN-OS Release 3.1(3):
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Use
the SAN-OS image you want to downgrade to in the To SAN-OS Release column of the table and use
the path recommended.
The software downgrade information in
Note
Downgrading system software disrupts IP and SSM intelligent services traffic.
Cisco MDS 9000 Family Release Notes for Cisco MDS SAN-OS Release 3.1(3)
18
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
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Table 6 for the nondisruptive downgrade path for all SAN-OS releases.
SSM: Intelligent services traffic on the SSM, such as SANTap, NASB, and FC write
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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.
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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,
enable iSCSI if an IPS module or a MPS-14/2 module is online in the switch. Otherwise, the
downgrade will disrupt traffic.
IVR: With IVR enabled, you must follow additional steps if you are downgrading from Cisco
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SAN-OS Release 2.1.(1a), 2.1(1b), or 2.1.(2a). See the
on page 13 for these instructions.
FICON: If you have FICON enabled, the downgrade path is different. See
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iSNS: The iSNS feature does not support a graceful downgrade from Cisco MDS SAN-OS
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Release 3.1(3) to any earlier SAN-OS release. Prior to a downgrade from Cisco SAN-OS 3.1(3),
disable the MDS iSNS server and remove all configurations associated with the MDS iSNS
client.
Table 6 to determine your nondisruptive downgrade path from Cisco SAN-OS Release 3.1(3). Find
"Upgrading with IVR Enabled" section
Table 6 applies only to Fibre Channel switching traffic.
Table 7.
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