Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.2(8a) (OL-27554-05, May 16, 2013)

Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.2(8a)

OL-27554-05

Downgrading Your Cisco MDS SAN-OS Software Image

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no switchport mode st to negate the SPAN target port mode for the SPAN target port

General Downgrading Guidelines

Follow these general guidelines before you perform a a software downgrade:

• 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 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:

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FCoE: Fibre Channel over Ethernet requires Cisco NX-OS Release 5.2(x). A downgrade from

Release 5.2(x) disrupts and stops all FCoE traffic.

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Fibre Channel Ports: Fibre Channel ports can be nondisruptively downgraded without

affecting traffic on the ports. See Table 15 for the nondisruptive downgrade path for all SAN-OS

releases.

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Gigabit Ethernet Ports: Traffic on Gigabit Ethernet ports is disrupted during a downgrade.

This includes IPS modules and the Gigabit Ethernet ports on the MSM-18/4 module, and the

MDS 9222i switch. 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.

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

Downgrade Paths” section on page 24.