Cisco MDS 9000 Series Release Notes, Release 8.4(2)

About Software Images

The Cisco MDS NX-OS operating system is shipped with the Cisco MDS 9000 Series Switches. The Cisco MDS NX-OS software consists of two images: the kickstart image and the system image. These images can be upgraded or downgraded to different versions. The versions of both images must match for the system to boot.

Each model of Cisco MDS switch has unique kickstart and system images. For more information on the image names for each Cisco MDS switch, see the Cisco MDS 9000 NX-OS Software Upgrade and Downgrade Guide, Release 8.x.

To download new Cisco MDS 9000 Series software, including Cisco MDS NX-OS and Cisco DCNM management software, go to the Storage Networking Software download website at https://software.cisco.com/download/home.

Choosing Between Cisco MDS NX-OS Open Systems Releases

Cisco uses release numbering to indicate the maturity of a Cisco MDS NX-OS release train. Cisco MDS NX-OS major versions are incremented when significant software features or hardware support are added. Because of the focus on new features and hardware, all defects may not yet have been fixed. After an initial release, minor version numbers of the train are incremented, and only security patches and defect fixes are added, providing better stability to the new features and updated security.

Details about the new features and hardware supported by Cisco MDS NX-OS Release 8.4(2) can be found in the “New Hardware and Software Features” section. For information about other releases, refer to the Release Notes on the Cisco MDS 9000 NX-OS and SAN-OS Software documentation page.

For Cisco recommended MDS NX-OS releases for each type of hardware, see the Recommended Releases for Cisco MDS 9000 Series Switches document.

General Upgrading Guidelines

This section lists the general guidelines for performing a software upgrade:

• Install and configure dual supervisor modules before the upgrade.
• Issue the show install all impact upgrade-image command to determine if the upgrade will be nondisruptive.
• Some features are impacted whether an upgrade is disruptive or nondisruptive:

– Fibre Channel Ports : Fibre Channel ports can be nondisruptively upgraded without affecting traffic on the ports. See the “Open Systems Nondisruptive Upgrade Paths” section for all MDS NX-OS releases.

– IP Storage (IPS) Ports : Traffic on IPS ports on Cisco MDS 9250i and Cisco MDS 24/10-Port SAN Extension Modules is disrupted during an upgrade or downgrade. Nodes that are members of VSANs traversing an FCIP ISL are impacted, and a fabric reconfiguration may occur. iSCSI initiators connected to the IPS ports lose connectivity to iSCSI targets while the upgrade is in progress.

Note In addition to these guidelines, review the information in the “Limitations and Restrictions” section before a software upgrade to determine if a feature may possibly behave differently following the upgrade.

• To upgrade or downgrade to a Cisco MDS NX-OS release version, the same release version of the kickstart and system images in the install all command must be used.
• If you are upgrading Cisco MDS 9700 Series Switches from Cisco MDS NX-OS Release 8.3(1), Release 8.3(2), Release 8.4(1), and Release 8.4(1a) to Release 8.4(2) or later, ensure that you perform a switchover before upgrading. For more information, see CSCvt87216.

Open Systems Nondisruptive Upgrade Paths

The software upgrade information in this section applies only to Fibre Channel switching traffic. Upgrading system software disrupts IP traffic and intelligent services traffic.

Note If the SAN Analytics feature is enabled, then disable the SAN Analytics feature using the no feature analytics command before upgrading from Cisco MDS NX-OS 8.2(x) or Cisco MDS NX-OS 8.3(x) to Cisco MDS NX-OS Release 8.4(2). However, you can upgrade from Cisco MDS NX-OS Release 8.4(1) and Release 8.4(1a) to Cisco MDS NX-OS Release 8.4(2) without disabling the feature.

General Downgrading Guidelines

Follow these general guidelines before performing a software downgrade:

• Disable all features that are not supported by the downgrade release. Use the show incompatibility system downgrade-image command to determine the features that needs to be disabled.
• Use the show install all impact downgrade-image command to determine if the downgrade is nondisruptive.
• The following features are impacted during a downgrade, whether it is a nondisruptive downgrade or a disruptive downgrade:

– Fibre Channel Ports : Fibre Channel ports can be nondisruptively downgraded without affecting traffic on the ports.

– IPS Ports : Traffic on IPS ports on Cisco MDS 9250i and Cisco MDS 24/10-Port SAN Extension Modules is disrupted during an upgrade or downgrade. Nodes that are members of VSANs traversing an FCIP ISL are impacted, and a fabric reconfiguration may occur. iSCSI initiators connected to the IPS ports lose connectivity to iSCSI targets while the upgrade is in progress.

Find the MDS NX-OS image that you want to downgrade to in the To MDS NX-OS Release column of the Table 3 and follow the steps in the order specified to perform the downgrade.

Note The software downgrade information in the below tables applies only to Fibre Channel switching traffic. Downgrading system software disrupts IP and intelligent services traffic.

• Any hardware that is not supported by the downgrade release version will be powered down when the downgrade release starts running. Power off and or remove any unsupported components before downgrading. For more information about supported hardware see the Cisco MDS 9000 Series Compatibility Matrix.
• If you are downgrading to Cisco MDS NX-OS Release 8.1(x), Release 8.2(x), Release 8.3(x), or Release 8.4(1x) from Release 8.4(2x) and if smart license and VSAN policy for a role are configured, ensure that you disable Smart Licensing or disable VSAN policy for only the role before downgrading or performing a switchover. You can reenable these features after downgrading or performing the switchover. For more information, see CSCvy19014.

Note If you are downgrading from Cisco MDS NX-OS Release 9.2(1) or later releases to a release prior to Cisco MDS NX-OS Release 9.2(1), ensure that you use the clear logging onboard txwait command after downgrading. Otherwise, logging to the OBFL TxWait file may cease with an error. For more information, see the Cisco MDS 9000 Series Interfaces Configuration Guide, Release 9.x.

ISSD Guidelines for Cisco MDS 9396S Switch

• Downgrading from Cisco MDS NX-OS Release 8.x to Cisco MDS NX-OS Release 7.3(0)D1(1) or Cisco MDS NX-OS Release 6.2(13a) is not supported on a Cisco MDS 9396S Switch which has DS-CAC-1200W as a power supply unit (PSU) and DS-C96S-FAN-I as port side intake fan tray.
• Downgrading from Cisco MDS NX-OS Release 8.x to Cisco MDS NX-OS Release 6.2(13) is not supported on the Cisco MDS 9396S Multilayer Fabric Switch. The minimum recommended image for Cisco MDS 9396S Multilayer Fabric Switch is 6.2(13a).

ISSD Guidelines for Cisco MDS 9250i Switch

• Downgrading from Cisco MDS NX-OS Release 8.x to Cisco MDS NX-OS Release 7.3(0)D1(1), or 6.2(13a) and lower is not supported on a Cisco MDS 9250i Switch which has only one online PSU.
• Downgrading from Cisco MDS NX-OS Release 8.x to Cisco MDS NX-OS Release 7.3(0)D1(1), or 6.2(13a) and lower on a Cisco MDS 9250i Switch with two online PSUs results in loss of N:N grid redundancy. The switch will run in non-redundant mode.
• Downgrading from Cisco MDS NX-OS Release 8.x to Cisco MDS NX-OS Release 7.3(0)D1(1), or 6.2(13a) and lower on a Cisco MDS 9250i Switch with three online PSUs results in loss of N:N grid redundancy. The switch will run in N+1 power redundant mode.

Open Systems Nondisruptive Downgrade Paths

• Downgrading directly from Cisco MDS NX-OS Release 8.1(1) and Release 8.1(1b) to releases before Cisco MDS NX-OS Release 6.2(9) is not supported. In such a scenario, we recommend that you first downgrade to Cisco MDS NX-OS Release 6.2(13a) or higher and then downgrade to the required release.
• Downgrading directly from Cisco MDS NX-OS Release 8.1(1) to Cisco MDS NX-OS Release 7.3(0)DY(1) is not supported. In such a scenario, we recommend that you first downgrade to Cisco MDS NX-OS Release 7.3(0)D1(1) and then upgrade to 7.3(0)DY(1).
• Downgrading directly from Cisco MDS NX-OS Release 8.1(1) to Cisco MDS NX-OS Release 7.3(1)DY(1) is not supported. In such a scenario, we recommend that you first downgrade to Cisco MDS NX-OS Release 7.3(0)D1(1) and then upgrade to 7.3(1)DY(1).
• Downgrading from Cisco MDS NX-OS Release 8.1(1) and Release 8.1(1b) is not supported if the FLOGI Scale Optimization feature is enabled on the Cisco MDS 9718 Switches.

Nondisruptive Downgrade Paths from Cisco MDS NX-OS Release 8.4(2)

New Hardware Features in Cisco MDS NX-OS Release 8.4(2)

There are no new hardware features in Cisco MDS NX-OS Release 8.4(2).

New Software Features and Enhancements in Cisco MDS NX-OS Release 8.4(2)

The following software features were introduced in Cisco MDS NX-OS Release 8.4(2):

• Zoning Single Session Configuration
• 32-Gbps ELW Optics Support for Cisco MDS 9700 Series Multilayer Directors and Fabric Switches
• Increased Configuration Limits
• Python 3

The following software features were enhanced in Cisco MDS NX-OS Release 8.4(2):

• RTT Statistics per TCP Session
• Standby Supervisor’s mgmt0 Link
• Extended Receiver Ready (ER_RDY)
• N Port Identifier Virtualization (NPIV)
• Internal CRC Detection and Isolation
• Interface Counters
• Consistency Checker
• reload Command

The following software features were introduced in Cisco MDS NX-OS Release 8.4(2):

Zoning Single Session Configuration

A new option to allow only a single configuration session at a time on a switch when in enhanced zoning mode is introduced.

The following commands were introduced:

• [ no ] zone mode enhanced vsan id [ single-session ]
• show zone status vsan id

For more information, see the “Configuring and Managing Zones” chapter in the Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x and the Cisco MDS 9000 Series Command Reference, Release 8.x.

32-Gbps ELW Optics Support for Cisco MDS 9700 Series Multilayer Directors and Fabric Switches

Support for the Extended Long Wave DS-SFP-FC32G-ELW SFP in 32 Gbps Director Modules and Fabric Switches is introduced.

For more information, see the Cisco MDS 9000 Series Compatibility Matrix, Release 8.x and the Cisco MDS 9000 Family Pluggable Transceivers Data Sheet.

Increased Configuration Limits

The following maximums are increased:

• Support for 4000 FLOGIs per switch on Cisco MDS 9396T switches.
• Support for 8000 FLOGIs on Cisco MDS 9710 switches with Cisco MDS 9700 Series Supervisor-4 Module (DS-X97-SF4-K9).
• Support for 250 members per zone with Smart Zoning on all platforms.

For more information, see the Cisco MDS NX-OS Configuration Limits, Release 8.x.

Python 3

Added support for Python 3.7.3. Use the python3 command to check the Python version that is supported on the switch. For more information, see the “Python API” chapter in the Cisco MDS 9000 Series Programmability Guide, Release 8.x.

The following software features were enhanced in Cisco MDS NX-OS Release 8.4(2):

RTT Statistics per TCP Session

The show interface fcip fcip-id command output was modified to support RTT statistics for each TCP connection.

For more information, see the “Configuring FCIP” chapter in the Cisco MDS 9000 Series IP Services Configuration Guide, Release 8.x.

Standby Supervisor’s mgmt0 Link

The standby supervisor's management Ethernet link on Cisco MDS Director switches is brought up when the supervisor reaches the standby state.

For more information, see the Cisco MDS 9000 Series High Availability Configuration Guide, Release 8.x.

Extended Receiver Ready (ER_RDY)

Added virtual link (VL) information for port-channels in the show interface interface-range counters detailed command output.

For more information, see the Cisco MDS 9000 Series Command Reference, Release 8.x.

N Port Identifier Virtualization (NPIV)

The N Port Identifier Virtualization (NPIV) feature is enabled by default. This feature was disabled by default in Cisco MDS NX-OS Release 8.4(1a) and earlier releases.

For more information, see the “Configuring N Port Virtualization” chapter in the Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x.

Internal CRC Detection and Isolation

Added an option to log internal CRC errors without taking any action.

The log-only keyword was added to the hardware fabric crc [ threshold threshold-count ] [ log-only ] command.

For more information, see the Cisco MDS 9000 Series High Availability Configuration Guide, Release 8.x and the Cisco MDS 9000 Series Command Reference, Release 8.x.

Interface Counters

The show interface [ interface-range ] counters detailed command output was completely restructured to provide an easier to understand and parse format. This new output affects the NX-API output.

The following new counters were introduced:

• Rx 5 min rate bit/sec
• Tx 5 min rate bit/sec
• Rx 5 min rate bytes/sec
• Tx 5 min rate bytes/sec
• Rx 5 min rate frames/sec
• Tx 5 min rate frames/sec
• Rx B2B credit remaining
• Rx B2B credit remaining for VL 0
• Rx B2B credit remaining for VL 1
• Rx B2B credit remaining for VL 2
• Rx B2B credit remaining for VL 3
• Tx B2B credit remaining
• Tx B2B credit remaining for VL 0
• Tx B2B credit remaining for VL 1
• Tx B2B credit remaining for VL 2
• Tx B2B credit remaining for VL 3
• Tx Low Priority B2B credit remaining
• Last clearing of "show interface" counters

For more information, see the Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x and the Cisco MDS 9000 Series Command Reference, Release 8.x.

Consistency Checker

The Consistency Checker feature has been enhanced. Added support for SAN Analytics and SAN Telemetry Streaming, Fibre Channel Name Server (FCNS), and F ports.

reload Command

The reload module module-number non-disruptive and reload system non-disruptive commands are introduced. These commands are used to nondisruptively netboot a module.

For more information, see the Cisco MDS 9000 Series Command Reference, Release 8.x.

Data Mobility Manager

Starting from Cisco MDS NX-OS Release 8.1(1), the Cisco MDS Data Mobility Manager is not supported on Cisco MDS 9000 Series Switches.

Zoning Features

LUN zoning, read-only zones, and broadcast zones are no longer supported. These features affect the following hardware:

• Cisco MDS 9250i Multiservice Fabric Switch
• Cisco MDS 9396S Multilayer Fabric Switch
• Cisco MDS 9700 48-port 16-Gbps Fibre Channel Module

If these features are already configured, completely remove all the configurations that include these features before attempting to bring up these modules. In addition, you cannot configure these features after you bring up these modules.

Slow Drain Detection and Congestion Isolation Enhancements

ER_RDY is not supported on FC interfaces running at 10 Gbps.

XRC Acceleration License

Starting from Cisco MDS NX-OS Release 8.1(1a), the Cisco Extended Remote Copy (XRC) acceleration license is obsoleted on Cisco MDS 9000 Series Switches due to improvements in the mainframe XRC feature.

FICON Tape Acceleration

FICON Tape Acceleration (FTA) is not supported on Cisco MDS 24/10 SAN Extension Module in Cisco MDS NX-OS Release 8.1(1a) but it is supported in Cisco MDS NX-OS Release 8.1(1b) and Release 8.4(1a).

FICON on Cisco MDS 48-Port 32-Gbps Fibre Channel Switching Module

FICON is not supported on Cisco MDS 48-Port 32-Gbps Fibre Channel Switching Module in Cisco MDS NX-OS Release 8.1(1a) but it is supported in Cisco MDS NX-OS Release 8.1(1b) and Release 8.4(1a).

Virtual Router Redundancy Protocol (VRRP)

From Cisco MDS NX-OS Release 8.3(1) and later, the VRRP feature is not supported on Cisco MDS 9000 Series Switches.

Deprecated Hardware

Starting from Cisco MDS NX-OS Release 8.1(1), the following hardware models are not supported:

• Cisco MDS 9513
• Cisco MDS 9509
• Cisco MDS 9506
• Cisco MDS 9500 Series Supervisor-2A Module
• Cisco MDS 24-Port 8-Gbps Fibre Channel Switching Module
• Cisco MDS 48-Port 8-Gbps Fibre Channel Switching Module
• Cisco MDS 32-Port 8-Gbps Advanced Fibre Channel Switching Module
• Cisco MDS 48-Port 8-Gbps Advanced Fibre Channel Switching Module
• Cisco MDS 10 Gbps 8-Port FCoE Module
• Cisco MDS 16-Port Storage Services Node (SSN-16)
• Cisco MDS 18/4-Port Multiservice Module (MSM)

Fibre Channel Read Diagnostic Parameters

Fibre Channel RDP querying is not supported on NPV, Port Channel, or FCoE links.

FCIP Support

• In Cisco MDS NX-OS Release 8.x, FCIP Write Acceleration is not supported between 24/10 San Extension Module and Cisco 18+4 MSM and Cisco SSN16 Modules.
• In Cisco MDS NX-OS Release 8.x, FCIP Write Acceleration along with IVR is not supported on FCIP tunnels configured on Cisco MDS 9700 Series switches.
• FCIP tunnels using Cisco MDS 24/10 Port SAN Extension Module cannot be used across FSPF equal cost paths.
• On Cisco MDS 24/10 Port SAN Extension Module, configuring multiple ECMP port channels with FCIP members in the same VSAN is not a valid configuration. If this is configured, then the traffic will flow through only one of the port channels.

40GE IP Storage (IPS) Interfaces Support on Cisco MDS 24/10-Port SAN Extension Module

40GE IP storage interfaces are not supported.

iSCSI Support

iSCSI is not supported on Cisco MDS 9700 Directors with Cisco MDS 24/10 port SAN Extension Modules.

HVDC PSU Support

The Cisco MDS 9700 HVDC PSU (DS-CHV-3.5KW) is not supported in Cisco MDS NX-OS Releases 8.1(1) and 8.1(1a). Do not attempt to load these releases on devices equipped with these PSUs or the systems will fail to power up.

Cisco TrustSec FC Link Encryption

Cisco TrustSec FC Link Encryption support for the following modules is available only on certain ports as mentioned below:

• 48-port 32-Gbps Fibre Channel Switching Module (DS-X9648-1536K9)—Support for Cisco TrustSec FC Link Encryption is available only on ports 9–12, 25–28, and 41–44.
• Cisco MDS 9132T Fibre Channel Switch—Support for Cisco TrustSec FC Link Encryption is available only on ports 9–12, 25–28.
• Cisco MDS 9148T Fibre Channel Switch—Support for Cisco TrustSec FC Link Encryption is available only on ports 9–12, 25–28, and 41–44.
• Cisco MDS 9396T Fibre Channel Switch—Support for Cisco TrustSec FC Link Encryption is available only on 9–12, 25–28, 41–44 base ports, and 57–60, 73–76, and 89–92 ports as applicable.

Subscribing for Important Product Update Notifications

Cisco provides a subscription service to notify of important events related to the Cisco MDS software and hardware for the following categories:

• Cisco Security Advisories
• Field Notices
• End-of-Sale, End-of-Life, and End-of-Support Announcements
• Software Updates [New, Certified, Software Advisories, Deferred, Obsoleted]
• Updates to Known Bugs

We recommend that you at least subscribe to the Field Notices, Security Advisories, and Software Updates [New, Certified, Software Advisories, Deferred, Obsoleted] categories, if not all categories, so that you can receive notifications about any critical product issues.

To subscribe to a category for receiving notifications of important updates:

1. Go to https://cway.cisco.com/mynotifications, and log in to your account.

2. Click Create Subscription.

3. Follow the onscreen instructions.

Note You must renew your notification subscriptions annually.

Resolved Caveats in Cisco MDS NX-OS Release 8.4(2)

Open Caveats in Cisco MDS NX-OS Release 8.4(2)

Release Notes

http://www.cisco.com/c/en/us/support/storage-networking/mds-9000-nx-os-san-os-software/products-release-notes-list.html

Licensing Information

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/8_x/config/licensing/cisco_mds9000_licensing_guide_8x.html

Regulatory Compliance and Safety Information

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/hw/regulatory/compliance/RCSI.html

Compatibility Information

http://www.cisco.com/c/en/us/support/storage-networking/mds-9000-nx-os-san-os-software/products-device-support-tables-list.html

Installation and Upgrade

http://www.cisco.com/c/en/us/support/storage-networking/mds-9000-nx-os-san-os-software/products-installation-guides-list.html

Configuration Guides

http://www.cisco.com/c/en/us/support/storage-networking/mds-9000-nx-os-san-os-software/products-installation-and-configuration-guides-list.html

Command-Line Interface

http://www.cisco.com/c/en/us/support/storage-networking/mds-9000-nx-os-san-os-software/products-command-reference-list.html

Troubleshooting and Reference

http://www.cisco.com/c/en/us/support/storage-networking/mds-9000-nx-os-san-os-software/tsd-products-support-troubleshoot-and-alerts.html

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