Cisco DS-X9530-SF1-K9 - Supervisor-1 Module - Control Processor Troubleshooting Guide download pdf (Page 20)

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Cisco MDS 9000 Family Release Notes for Cisco MDS SAN-OS Release 3.2(3)

OL-14116-04

Downgrading Your Cisco MDS SAN-OS Software Image

If you are performing an upgrade on one of those switches, you should follow the nondisruptive upgrade

path shown in Table 5, even though the upgrade is disruptive. Following the nondisruptive upgrade path

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(2)

or earlier version to SAN-OS Release 3.2(3)), 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:

• General Downgrading Guidelines, page 20

• Downgrading the SSI Image on Your SSM, page 22

General Downgrading Guidelines

Use the following guidelines to nondisruptively downgrade your Cisco MDS SAN-OS Release 3.2(3):

• 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 7 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, 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.

–

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, MPS-14/2 module, MSM-18/4 module, or the MDS 9222i

switch is online. Otherwise, the downgrade will disrupt traffic.

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