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

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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
Downgrading Guidelines Specific to NX-OS Release 5.2(8a)
The following guidelines apply to a downgrade from Cisco MDS NX-OS Release 5.2(8a):
• Cisco NX-OS Release 5.2(8a) and later releases support IDLE as a fill word for the switchport
fill-pattern command. Releases earlier than Release 5.2(8a) supported only the ARBFF fill word.
As a result, when you downgrade from Cisco NX-OS Release 5.2(8a) or a later release to an earlier
release that does not support the IDLE fill word, the following syntax error occurs:
Syntax error while parsing 'switchport fill-pattern IDLE speed 8000'
The syntax error message is harmless and can be ignored.
• You cannot nondisruptively downgrade from NX-OS Release 5.2(8a) to NX-OS Release 5.0(x) if
you installed NX-OS Release 5.2(8a) 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(8a) on an MDS 9509 or MDS 9506 switch, you can nondisruptively
downgrade to NX-OS Release 5.0(x).
• If you have the Storage Media Encryption (SME) application configured on your system, you must
delete signature clusters when downgrading from Cisco NX-OS Release 5.2(8a) to Release 5.2(1).
• Following an ISSD from Cisco NX-OS Release 5.2(8a) to an earlier Release 5.2(x) or to Release
5.0(x) on a Cisco MDS 9000 switch that is configured with IVR or FCR, reload the modules with
the ELS trap entry. In the case of FCR, reload the module with the FCR device logged in. For IVR,
all modules should be reloaded.
• 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(8a) 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