Table Of Contents
Cisco Nexus 3000 Series NX-OS Release Notes, Release 5.0(3)U2(1)
Cisco Nexus 3000 Series Switches
System Buffer Occupancy Information
Increased Verified Multicast Routes
Remote Multicast Source Support
Support for Granular Input Packet Discards Information
Obtaining Documentation and Submitting a Service Request
©2011 Cisco Systems, Inc. All rights reserved.
Cisco Nexus 3000 Series NX-OS Release Notes, Release 5.0(3)U2(1)
Release Date: August 31, 2011Part Number: OL-25704-01 C0This 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.
Table 1-1 Online History Change
Revision Date DescriptionA0
August 31, 2011
Created NX-OS Release 5.0(3)U2(1) release notes.
B0
September 29, 2011
Updated CSCts17928.
C0
November 28, 2013
Updated resolved caveat CSCuh79034.
Contents
This document includes the following sections:
•Obtaining Documentation and Submitting a Service Request
Introduction
The Cisco NX-OS software is a data center-class operating system built with modularity, resiliency, and serviceability at its foundation. Based on the industry-proven Cisco MDS 9000 SAN-OS software, 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:
•Cisco NX-OS runs on all Cisco data center switch platforms: Cisco Nexus 7000, Nexus 5000, Nexus 4000, Nexus 3000, Nexus 2000, and Nexus 1000V Series switches.
•Cisco NX-OS software interoperates with Cisco products running any variant of Cisco IOS software and also with any networking operating system that conforms to common networking standards.
•Cisco NX-OS modular processes are triggered on demand, each in a separate protected memory space. Processes are started and system resources are allocated only when a feature is enabled. The modular processes are governed by a real-time preemptive scheduler that helps ensure timely processing of critical functions.
•Cisco NX-OS provides a programmatic XML interface based on the NETCONF industry standard. The Cisco NX-OS XML interface provides a consistent API for devices. Cisco NX-OS also provides support for Simple Network Management Protocol (SNMP) Versions 1, 2, and 3 MIBs.
•Cisco NX-OS enables administrators to limit access to switch operations by assigning roles to users. Administrators can customize access and restrict it to the users who require it.
Cisco Nexus 3000 Series Switches
Cisco NX-OS Release 5.0(3)U2(1) supports the new Cisco Nexus 3048 switch, the Cisco Nexus 3064-E switch, and the Cisco Nexus 3064 switch. 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 3048 switch is a 1 rack unit (RU) switch that supports 48 100/1000 Ethernet server-facing (downlink) ports, four 1- and 10-Gigabit network-facing (uplink) ports, two 100/1000 management ports, and one console port. The Cisco Nexus 3064 switch is a 1 RU switch that supports 48 1- or 10-Gigabit downlink ports, four quad 10-Gigabit ports, two 100/1000 management ports, and one console port. Each switch includes one or two power supply units and one fan tray module, and each switch can be ordered with either standard (port-side exhaust) airflow or reverse (port-side intake) airflow for cooling. The Cisco Nexus 3000 Series switches run the industry-leading Cisco NX-OS Software operating system.
For information about the new Cisco Nexus 3048 switch, see the "New Hardware Features" section. For information about the Cisco Nexus 3000 Series, see the Cisco Nexus 3000 Series Hardware Installation Guide.
System Requirements
This section includes the following topics:
Memory Requirements
The Cisco NX-OS Release 5.0(3)U2(1) software requires 135MB of flash memory.
Hardware Supported
Cisco NX-OS Release 5.0(3)U2(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)U2(1) software.
Upgrade Requirements
Before upgrading from Cisco NX-OS Release 5.0(3)U1(2a) and earlier releases to NX-OS Release 5.0(3)U2(1), Cisco recommends that you do a write-erase and reload.
New and Changed Features
This section describes the new features introduced in Cisco NX-OS Release 5.0(3)U2(1). This section includes the following topics:
New Hardware Features
This section describes the new hardware features:
Cisco Nexus 3048 Switch
The Cisco Nexus 3048 switch includes the following features:
•1 RU fixed form-factor 1-, 10-Gigabit Ethernet switch offering a throughput of up to 96Gbps.
•48 10/100/1000 Ethernet downlink ports.
•4 10-Gigabit Ethernet uplink (network-facing) ports.
•4 1/10-Gigabit uplink port
•2 100/1000 Ethernet management ports.
•Console port.
•1 USB port.
•1 or 2 power supply units ordered with standard or reverse airflow (one power supply required for operations, two required for redundancy).
•1 Fan tray ordered with standard or reverse airflow.
Note The Cisco Nexus 3048switch includes two management ports; however, Cisco NX-OS Release 5.0(3)U2(1) provides support for one management port.
New Software Features
Cisco NX-OS Release 5.0(3)U2(1) includes the new software features described in this section. All Cisco Nexus 3000 Series switches are supported by Cisco NX-OS Release 5.0(3)U2(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.
This section includes the following topics:
•System Buffer Occupancy Information
•Increased Verified Multicast Routes
•Remote Multicast Source Support
•Support for Granular Input Packet Discards Information
Control Plane Policing
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series supports the Control Plane Policing (CoPP) feature.
CoPP protects the control plane and separates it from the data plane, thereby ensuring network stability, reachability, and packet delivery. This feature allows a policy map to be applied to the control plane. This policy map looks like a normal QoS policy and is applied to all traffic destined to any of the IP addresses of the router or Layer3 switch. A common attack vector for network devices is the denial-of-service (DoS) attack, where excessive traffic is directed at the device interfaces.
For information on CoPP, see the Cisco Nexus 3000 Series NX-OS Security Configuration Guide, Release 5.0(3)U2(1) and the Cisco Nexus 3000 Series NX-OS Command Reference, Release 5.x.
Virtual Port Channels
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series supports virtual port channels (vPC).
A vPC allows links that are physically connected to two different Cisco Nexus 3000 Series switches to appear as a single port channel by a third device. The third device can be a switch, server, or any other networking device. A vPC can provide multipathing, which allows you to create redundancy by enabling multiple parallel paths between nodes and load balancing traffic where alternative paths exist.
For information on vPCs, see the Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U2(1) and the Cisco Nexus 3000 Series NX-OS Command Reference, Release 5.x.
System Buffer Occupancy Information
Beginning with Cisco NX-OS Release 5.0(3)U2(1), you can monitor egress per-port per-queue occupancy in the running system. Use the show hardware internal buffer info pkt-stats command to check the instantaneous queue and buffer occupancy in the system. The switch output shows the following:
•Instantaneous queue build-up in the system for both unicast and multicast traffic per port.
•System level instantaneous and maximum egress buffer occupancy.
40-Gigabit Port Mode
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series supports 4x 40-Gigabit port mode support. You can configure a Quad small form-factor pluggable (QSFP+) port using the hardware profile portmode command. The supported modes are 48x10g+4x40g and 64x10g. The default mode is 64x10g. A reboot is required to switch between modes.
For information on configuring the 40-Gigabit port mode, see the Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U2(1) and the Cisco Nexus 3000 Series NX-OS Command Reference, Release 5.x.
Increased Verified Multicast Routes
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series supports a maximum of 8,000 multicast routes.
For information on verified scalability, see the Cisco Nexus 3000 Series NX-OS Verified Scalability Guide for NX-OS Release 5.0(3)U2(1).
Remote Multicast Source Support
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series includes remote multicast forwarding (MFWD) source support.
If a multicast traffic is received from a source which is not attached, the (S,G) route is not formed and all traffic continuously hits the CPU. You can enable remote multicast source support to redirect the traffic.
When this feature is enabled and a static mroute to the source is configured using the ip mroute src-ip next-hop command, the (S,G) route is formed without traffic hitting the CPU. Also, for these sources, register messages are sent periodically and MSDP SA messages are sent to the peer.
For information on remote multicast source support, see the Cisco Nexus 3000 Series NX-OS Multicast Routing Configuration Guide, Release 5.0(3)U2(1) and the Cisco Nexus 3000 Series NX-OS Command Reference, Release 5.x.
To register MFWD static routes, use the ip mfwd mstatic command.
ACL TCAM Regions
Beginning with Cisco NX-OS Release 5.0(3)U2(1), you can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware.
When you change the TCAM region size, the new TCAM size is saved in the running configuration. To apply the new TCAM size, copy the running configuration to the startup configuration using the copy running-config startup-config command then use the reload command to restart the switch.
For information on this feature, see the Cisco Nexus 3000 Series NX-OS Security Configuration Guide, Release 5.0(3)U2(1) and the Cisco Nexus 3000 Series NX-OS Command Reference, Release 5.x.
Use the hardware profile tcam region command to increase the size of the router ACL (RACL) ternary content addressable memory (TCAM) drivers.
Disabling Link Negotiation
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series supports disabling link negotiation on 1-Gigabit ports when the connected peer does not support auto negotiation. By default, auto-negotiation is enabled on 1-Gigabit ports and disabled on 10-Gigabit ports. Use the no negotiate auto command to disable auto negotiation on 1-Gigabit ports.
PING Enhancements
Beginning with Cisco NX-OS Release 5.0(3)U2(1), you can specify a Layer 3 port channel (parent-interface) and its member interface. If the ping destination is reachable using the specified Layer 3 port channel, the ICMP request is sent over the specified member interface.
To determine the network connectivity to IPv6 multicast groups, use the ping6 command.
Support for Granular Input Packet Discards Information
Beginning with Cisco NX-OS Release 5.0(3)U2(1), you can get a more detailed information on what specific condition led to an input discard on a given interface. Use the show hardware internal interface indiscard-stats front-port x command to determine the condition that could be potentially responsible for the input discards that are seen on port eth1/x. The switch output shows the discards for IPv4, STP, input policy, ACL specific discard, generic receive drop, and VLAN related discards.
Use the show hardware internal interface indiscard-stats front-port x command to determine the condition that could be potentially responsible for the input discards.
Glean Throttling
Beginning with Cisco NX-OS Release 5.0(3)U2(1), the Cisco Nexus 3000 Series supports IP glean throttling.
When forwarding an incoming IP packet, if the Address Resolution Protocol (ARP) request for the next hop is not resolved, the packet is forwarded to the supervisor CPU. The CPU resolves the MAC address for the next hop and programs the hardware.
The Cisco Nexus 3000 Series device hardware has glean rate limiters to protect the supervisor from the glean traffic. If the maximum number of entries is exceeded, the packets for which the ARP request is not resolved continues to be processed in the software instead of getting dropped in the hardware.
When an ARP request is sent, the software adds a /32 drop adjacency in the hardware to prevent the packets to the same next-hop IP address to be forwarded to the supervisor. When the ARP is resolved, the hardware entry is updated with the correct MAC address. If the ARP entry is not resolved before a timeout period, the entry is removed from the hardware.
To enable hardware IP glean throttling, use the hardware ip glean throttle command.
For information on this feature, see the Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(1) and the Cisco Nexus 3000 Series NX-OS Command Reference, Release 5.x.
Limitations
This section describes the limitations for Cisco NX-OS Release 5.0(3)U2(1).
•When a private VLAN port is configured as a TX (egress) SPAN source, the traffic seen at the SPAN destination port is marked with the VLAN of the ingressed frame. There is no workaround.
•Multiple boot kickstart statements in the configuration are not supported.
Caveats
Open and resolved caveat record numbers are provided with links to the But Toolkit where you can find details about each caveat.
This section includes the following topics:
Open Caveats
Table 1-3 lists descriptions of open caveats in Cisco NX-OS Release 5.0(3)U2(1). The record ID links to the Cisco Bug Toolkit where you can find details about the caveat.
Resolved Caveats
Table 1-4 lists descriptions of resolved caveats in Cisco NX-OS Release 5.0(3)U2(1). The record ID links to the Cisco Bug Toolkit where you can find details about the caveat.
Related Documentation
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:
Release Notes
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
Command References
The command references are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/prod_command_reference_list.html
Technical References
The technical references are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/prod_technical_reference_list.html
Configuration Guides
The configuration guides are available at the following URL:
http://www.cisco.com/en/US/products/ps11541/products_installation_and_configuration_guides_list.html
Error and System Messages
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
Documentation Feedback
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.
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information, see What's New in Cisco Product Documentation at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html.
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©2011 Cisco Systems, Inc. All rights reserved.