Release Notes

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21
)Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(1a)
OL-21012-01
Downgrading Your Cisco MDS SAN-OS Software Image
• When you upgrade from SAN-OS Release 3.x to NX-OS Release 4.2(x), and then to NX-OS Release
5.x, SNMP notifications will not reset to their default settings.
• When you downgrade from any NX-OS Release 4.2(x), SNMP notifications will reset to their
default configuration settings.
Use the snmp-server enable traps command to reenable your required SNMP notifications.
Converting Automatically Created PortChannels Before an Upgrade
Before upgrading from NX-OS Release 4.1(x) or 4.2(x) to Release 5.x, ensure that you do not have any
automatically created PortChannels present in the switch configuration. Use the port-channel
persistent command to convert an automatically created PortChannel to a persistent PortChannel.
Failure to convert automatically created PortChannels prior to the upgrade can result in traffic disruption
because Autocreation of PortChannels is a deprecated feature as of NX-OS Release 4.1(1b).
Downgrading Your Cisco MDS SAN-OS Software Image
This section lists the guidelines recommended for downgrading your Cisco MDS SAN-OS software
image and includes the following topics:
• General Downgrading Guidelines, page 21
• New Features in Cisco MDS NX-OS Release 5.0(1a), page 25
• NX-OS Release 5.0(x) Software Downgrade and Upgrade Matrix for Cisco MDS 9509 and 9506
Switches, page 23
General Downgrading Guidelines
Use the following guidelines to nondisruptively downgrade your Cisco MDS NX-OS Release 5.0(1a):
• 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 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 Table 15 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