HP Cisco MDS 8/24c Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Rel - Page 18

Downgrading Your Cisco MDS SAN-OS Software Image Send documentation comments to [email protected] - 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(1). A downgrade from Release 5.2(1) disrupts and stops all FCoE traffic. - Fibre Channel Ports: Fibre Channel ports can be nondisruptively downgraded without affecting traffic on the ports. See Table 13 for the nondisruptive downgrade path for all SAN-OS releases. - 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. - FICON: If you have FICON enabled, the downgrade path is different. See the "FICON Downgrade Paths" section on page 20. Use Table 13 to determine the nondisruptive downgrade path from Cisco NX-OS Release 5.2(1). Find the NX-OS or SAN-OS image you want to downgrade to in the To SAN-OS Release column of the table and use the path recommended. Note The software downgrade information in Table 13 applies only to Fibre Channel switching traffic. Downgrading system software disrupts IP and intelligent services traffic. Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.2(1) 18 OL-25090-01