HP Cisco MDS 8/24c Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Rel - Page 20

Downgrading Your Cisco MDS SAN-OS Software Image Send documentation comments to [email protected] • You cannot nondisruptively downgrade from NX-OS Release 5.2(2) to NX-OS Release 5.0(x) if you installed NX-OS Release 5.2(2) on an MDS 9509 or MDS 9506 switch and you installed a Generation 4 module in the switch and performed a full switch reload. The reason for this restriction is the change in fabric mode that occurs following the switch reload with the Generation 4 hardware installed. The downgrade will be disruptive, even if you remove the Generation 4 module prior to starting the downgrade. If you do not install Generation 4 hardware or perform a full switch reload following the installation of NX-OS Release 5.2(2) on an MDS 9509 or MDS 9506 switch, then you can nondisruptively downgrade to NX-OS Release 5.0(x). • We recommend that you delete any SPAN configuration, Fibre Channel tunnel, or tunnel-ID map configuration from your switch before you downgrade from NX-OS Release 5.2(2) to a lower version. If any SPAN session, SPAN destination, SPAN target, or Fibre Channel tunnel interface is configured, the installer should detect it and prompt you to delete these configurations. To gather information about SPAN sessions and delete them, use the following commands in this order: - show incompatibility systems bootflash:image_name to display any incompatible configurations - show span session to check the current configuration for a SPAN session - no span session session-number to delete a SPAN session - show running-config | include fc-tunnel to check the current Fibre Channel tunnel configuration - no interface fc-tunnel y to delete a Fibre Channel tunnel on the switch that is the source for the Fibre Channel tunnel - show interface brief | include SD to check the current configuration for a SPAN destination port configuration - show interface brief | include ST to check the current configuration for a SPAN target port configuration - no fc-tunnel tunnel-map z interface x/y to remove an Fibre Channel tunnel map - no switchport mode sd to negate the SPAN destination port mode for the SPAN destination port - 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: - 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. Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.2(2) 20 OL-25090-02