Cisco Cisco MDS 9000 NX-OS Software Release 6.2

This section lists the guidelines recommended for downgrading your Cisco MDS SAN-OS software image and includes the 
following topics:

Follow these general guidelines before you perform a software downgrade:

Issue the system no acl-adjacency-sharing EXEC command to disable ACL adjacency usage on Generation 2 modules 
(Generation 2 modules or switches can have one or more ports in port groups that share common resources such as 
bandwidth and buffer credits.). 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 
command to determine what you need to disable. 

Use the show install all impact downgrade-image 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: Fibre Channel ports can be nondisruptively downgraded without affecting traffic on the ports. 
See 

 for the nondisruptive downgrade path for all SAN-OS releases.

Gigabit Ethernet Ports: Traffic on GigabitEthernet/IPStorage ports is disrupted during a downgrade. This includes 
the Gigabit Ethernet ports on the MSM-18/4 module, the MDS 9222i switch, the MDS 9000 16-Port Storage Services 
Node (SSN-16), and the IPStorage ports in MDS 9250i. 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.

FICON: If you have FICON enabled, the downgrade path is different. See the 

Use 

 to determine the nondisruptive downgrade path from Cisco NX-OS Release 6.2(11b). Find the NX-OS or 

SAN-OS image that you want to downgrade to in the To SAN-OS Release column of the table and follow the steps in the order 
specified to perform the downgrade. 

NX-OS Release 5.2(2) or 
5.2(2s)

You can nondisruptively upgrade directly to NX-OS Release 6.2(5a) or 
6.2(5b).

NX-OS Release 4.2(7b)

You can nondisruptively upgrade directly to NX-OS Release 5.2(2).

NX-OS Release 4.2(1b)

You can nondisruptively upgrade directly to NX-OS Release 4.2(7b).

NX-OS Release 4.1(1c)

You can nondisruptively upgrade directly to NX-OS Release 4.2(1b).

SAN-OS Release 3.3(1c)

You can nondisruptively upgrade directly to NX-OS Release 4.2(1b).

SAN-OS Release 3.2(2c), 
3.0(3b), 3.0(3), and 3.0(2). 

First upgrade to SAN-OS Release 3.3(1c), and then upgrade to NX-OS 
Release 4.2(1b).