Cisco Nexus 3000 Series NX-OS Release Notes, Release 5.0(3)U4(1)
Cisco Nexus 3000 Series Switches
Twinax Cable Support on Cisco Nexus 3000 Switches
New Software Features in Cisco NX-OS Release 5.0(3)U4(1)
Resolved Caveats in NX-OS Release 5.0(3)U4(1)
Open Caveats in Release 5.0(3)U4(1)
Open Caveats in Release 5.0(3)U3(2b)
Obtaining Documentation and Submitting a Service Request
Part Number: OL-27712-01 I0
Current Release: Cisco NX-OS Release 5.0(3)U4(1)
This document describes the features, caveats, and limitations for Cisco Nexus 3000 Series switches. Use this document in combination with documents listed in the “Obtaining Documentation and Submitting a Service Request” section.
Note Table 1-1 shows the online change history for this document.
Added CSCtx36481 to Resolved Caveats in NX-OS Release 5.0(3)U4(1). |
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Added CSCua74854 to Resolved Caveats in NX-OS Release 5.0(3)U4(1). |
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Made a correction in the SPAN a Source Port to Two Dfferent Destination Ports section. |
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Updated Table 1-3 to show this release supports the Gigabit Ethernet SFP, LC connector SX transceiver (MMF), GLC-SX-MM. |
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Revised the Twinax Cable Support on Cisco Nexus 3000 Switches section. |
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Added references to Nexus 3064-T switch, associated hardware, related software support, and new 40G templates. |
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The Cisco NX-OS software is a data center-class operating system built with modularity, resiliency, and serviceability at its foundation. Cisco NX-OS helps ensure continuous availability and sets the standard for mission-critical data center environments. The highly modular design of Cisco NX-OS makes zero-effect operations a reality and enables exceptional operational flexibility. Cisco NX-OS software offers the following benefits:
The Cisco Nexus 3000 Series switches are high-performance, high-density, ultra-low-latency Ethernet switches that provide line-rate Layer 2 and Layer 3 switching. The Cisco Nexus 3000 Series includes the following switches:
Each switch includes one or two power supply units and one fan tray module, and each switch can be ordered with either forward (port-side exhaust) airflow or reverse (port-side intake) airflow for cooling. All platforms support both AC and DC power-supplies. All combinations of power (AC/DC) and airflow (forward/reverse) are available. The Cisco Nexus 3000 Series switches run the industry-leading Cisco NX-OS Software operating system.
For information about the Cisco Nexus 3000 Series, see the Cisco Nexus 3000 Series Hardware Installation Guide.
This section includes the following topics:
Cisco NX-OS Release 5.0(3)U4(1) supports the Cisco Nexus 3000 Series switches. You can find detailed information about supported hardware in the Cisco Nexus 3000 Series Hardware Installation Guide.
Table 1-2 shows the hardware supported by Cisco NX-OS Release 5.0(3) software.
Table 1-3 shows the transceivers supported by Cisco NX-OS Release 5.0(3) software.
40GBASE-CSR4 QSFP transceiver module with mpo connector 300 m 6 |
QSFP-40G-CSR4 6 |
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40GBASE-CSR4 QSFP transceiver module with mpo connector 300 m (using fiber splitter cables) 6 |
QSFP-40G-CSR4 6 |
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40GBASE-SR4 QSFP transceiver module with mpo connector 100 m |
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40GBASE-SR4 QSFP transceiver module with mpo connector 100 m (using fiber splitter cables) |
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10GBASE-ZR SFP+ module (single-mode fiber [SMF])1 |
SFP-10G-ZR 1 |
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10GBASE-DWDM SFP+ module (single-mode fiber [SMF]) 1 |
10-2767-01 1 |
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10GBASE-CU SFP+ cable 2 m (Twinax cable) 2 |
SFP-H10GB-CU2M2 |
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10GBASE-CU SFP+ cable 2.5 m (Twinax cable) 2 |
SFP-H10GB-CU2-5M 2 |
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GLC-SX-MM3 |
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Gigabit Ethernet SFP, LC connector SX transceiver (MMF)4 |
GLC-SX-MMD 4 |
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GLC-T 5 |
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SFP-GE-T 5 |
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100BASE-FX SFP module for Gigabit Ethernet ports GLC-GE-100FX6 |
10-2019-02 6 |
2.Supported on the Cisco Nexus 3048, Cisco Nexus 3064-X, Cisco Nexus 3064, and Cisco Nexus 3064-E switches. |
Starting with Cisco Release NX-OS 5.0(3)U1(1), the following algorithm is used to detect copper SFP+ twinax, QSFP+ twinax, and QSFP+ splitter cables on Cisco Nexus 3000 switches.
If the attached interconnect (transceiver) is a copper SFP+ twinax or QSFP+ twinax cable:
If the attached transceiver is a QSFP+ splitter cable, then no special check is performed. Software tries to bring up the port.
The following disclaimer applies to non-Cisco manufactured and non-Cisco certified QSFP copper splitter cables:
If a customer has a valid support contract for Cisco Nexus switches, Cisco TAC will support twinax cables that are a part of the compatibility matrix for the respective switches. However, if the twinax cables are not purchased through Cisco, a customer cannot return these cables through an RMA to Cisco for replacement.
If a twinax cable that is not part of the compatibility matrix is connected into a system, Cisco TAC will still debug the problem, provided the customer has a valid support contract on the switches. However TAC may ask the customer to replace the cables with Cisco qualified cables if there is a situation that points to the cables possibly being faulty or direct the customer to the cable provider for support. Cisco TAC cannot issue an RMA against uncertified cables for replacement.
This section describes the new features introduced in Cisco NX-OS Release 5.0(3)U4(1). This section includes the following topics:
Cisco NX-OS Release 5.0(3)U4(1) supports the following new hardware:
All Cisco Nexus 3000 Series switches are supported by Cisco NX-OS Release 5.0(3)U4(1). Cisco NX-OS interoperates with any networking OS, including Cisco IOS software, that conforms to the networking standards mentioned in the product data sheet.
Cisco NX-OS Release 5.0(3)U4(1) is a major release that includes bug fixes and the following new software features and software enhancements:
To provide flexibility with QSFP mode, these three additional 40 Gigabit template options were added for Nexus 3064 switches:
Added support for enhanced explicit congestion notification (ECN) marking, including configurable threshold and global buffer based ECN marking. ECN is an extension to WRED that marks packets instead of dropping them when the average queue length exceeds a specific threshold value. When configured with the WRED ECN feature, routers and end hosts use this marking as a signal that the network is congested to slow down sending packets.
sFlow allows you to monitor the real-time traffic in data networks that contain switches and routers. It uses the sampling mechanism in the sFlow Agent software on switches and routers for monitoring traffic and to forward the sample data on ingress and egress ports to the central data collector, also called the sFlow Analyzer.
Cisco NX-OS supports generic routing encapsulation (GRE) as a carrier protocol for a variety of passenger protocols. With GRE you can create tunnel interfaces in all VPN routing and forwarding (VRF) instances.
You can now display Quad small form-factor pluggable (QSFP+) port names 2-tuple mode instead of the default 3-tuple convention mode.
There are now 8 system logging destination ports available on Cisco Nexus 3000 Series switches.
By default, the RPF interface for multicast is chosen automatically when there are multiple ECMP paths available. You can now disable the automatic selection, allowing you to specify a single RPF interface for multicast.
Cisco Nexus 3000 Series switches now support a same source interface that can be spanned out on two destination interfaces. You can have the same source port in two sessions (with different destination ports) in both directions (RX and TX).
The ip pim register-source command is now available on Cisco Nexus 3000 Series switches. You can use the ip pim register-source command to configure the IP source address of register messages when the IP source address of a register message is not a uniquely routed address to which the rendezvous point (RP) can send packets.
BFD support for static routes is now available on Cisco Nexus 3000 Series switches.
When you change the Layer 3 interface MTU value to the jumbo MTU value (1500 bytes or greater), you must also change the network QoS MTU value to 1500 bytes or greater. The device generates a syslog message to inform you of this requirement.
The number of interfaces bundled by an EtherChannel on Cisco Nexus 3000 Series switches is now 32.
The area range command used to consolidate and summarize routes at an Open Shortest Path First (OSPF) area boundary, now has a cost option. The cost range is from 0 to 16777215.
USB support for PowerOn Auto Provisioning (POAP) is now available on Cisco Nexus 3000 Series switches.
Cisco NX-OS Release 5.0(3)U3(1) does not support a software upgrade from Cisco NX-OS Release 5.0(3)U2(2c). If you want to upgrade through this path, see CSC ty75328 for details about how to work around this issue.
Note This restriction does not apply to Cisco NX-OS Release 5.0(3)U3(2a) and Cisco NX-OS Release 5.0(3)U3(2).
In Cisco NX-OS Release 5.0(3)U3(1), support for IPv6 has been added in CoPP. To enable redirection of IPv6 control packets to the CPU, IPv6 CoPP must be configured on the system. Performing the write erase command on a device running Release 5.0(3)U3(1) automatically applies CoPP on the device and ensures that all IPv4 and IPv6 related CoPP configuration is setup correctly.
If you upgrade from a Cisco NX-OS release that does not support the CoPP feature to a release that does support the CoPP feature, you must run the setup utility after the upgrade to enable CoPP on the device.
If you upgrade from Cisco NX-OS Release 5.0(3)U2(2) (which supports the CoPP feature) to Cisco NX-OS Release 5.0(3)U3(1) (which adds CoPP classes for IPv6 support), you must run the setup script to enable the IPv6 CoPP feature on the device.
Open and resolved caveat record numbers are provided with links to the Bug Toolkit where you can find details about each caveat.
This section includes the following topics:
Table 1-4 lists descriptions of resolved caveats in Cisco NX-OS Release 5.0(3)U4(1). The record ID links to the Cisco Bug Toolkit where you can find details about the caveat.
Table 1-6 lists descriptions of open caveats in Cisco NX-OS Release 5.0(3)U4(1). The record ID links to the Cisco Bug Toolkit where you can find details about the caveat.
Table 1-6 lists descriptions of open caveats in Cisco NX-OS Release 5.0(3)U3(2b). The record ID links to the Cisco Bug Toolkit where you can find details about the caveat.
Documentation for the Cisco Nexus 3000 Series Switch is available at the following URL:
http://www.cisco.com/en/US/products/ps11541/tsd_products_support_series_home.html
The documentation set is divided into the following categories:
The release notes are available at the follwing URL:
http://www.cisco.com/en/US/products/ps11541/prod_release_notes_list.html
Installation and Upgrade Guides
The installation and upgrade guides are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/prod_installation_guides_list.html
The command references are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/prod_command_reference_list.html
The technical references are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/prod_technical_reference_list.html
The configuration guides are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/products_installation_and_configuration_guides_list.html
The system message reference guide is available at the following URL:
http://www.cisco.com/en/US/products/ps11541/products_system_message_guides_list.html
To provide technical feedback on this document, or to report an error or omission, please send your comments to nexus3k-docfeedback@cisco.com. We appreciate your feedback.
For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
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