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Several new hardware and software features are introduced for the Cisco Nexus 3548 switch to improve the performance, scalability, and management of the product line. Cisco NX-OS Release 6.0 also supports all hardware and software supported in Cisco NX-OS Release 5.1 and Cisco NX-OS Release 5.0.
Cisco NX-OS 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 that run 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 that is 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 3500 Series Switches
The Cisco Nexus 3500 platform is an extension of the Cisco Nexus 3000 Series of 100M, 1, 10, and 40 Gigabit Ethernet switches built from a switch-on-a-chip (SoC) architecture. Switches in the Cisco Nexus 3500 series include Algorithm Boost (or Algo Boost) technology that is built into the switch application-specific integrated circuit (ASIC). Algo Boost allows the Cisco Nexus 3548 switch to achieve Layer 2 and Layer 3 switching latencies of less than 200 nanoseconds (ns). In addition, Algo Boost contains several innovations for latency, forwarding features, and performance visibility, including two configurable modes for low latency:
Normal mode: This mode is suitable for environments needing low latency and high scalability.
Warp mode: This mode consolidates forwarding operations within the switching ASIC, lowering latency by up to an additional 20 percent compared to normal operation.
Active buffer monitoring accelerates the collection of buffer utilization data in hardware, allowing significantly faster sampling intervals. Even on the lowest-latency switches, data packets can incur a millisecond or more of latency during periods of congestion. Previous buffer utilization monitoring techniques were based entirely on software polling algorithms with polling with higher polling intervals that can miss important congestion events.
Cisco Nexus 3548 Switch
The Cisco Nexus 3548 switch is the first member of the Cisco Nexus 3500 platform. As a compact one-rack-unit (1RU) form-factor 10 Gigabit Ethernet switch, the Cisco Nexus 3548 switch provides line-rate Layer 2 and Layer 3 switching at extremely low latency. The switch runs Cisco NX-OS software that has comprehensive features and functions that are widely deployed globally. The Cisco Nexus 3548 contains no physical layer (PHY) chips, which allows low latency and low power consumption. The switch supports both forward and reversed airflow and both AC and DC power inputs.
For information about the Cisco Nexus 3500 Series, see the Cisco Nexus 3500 Series Hardware Installation Guide.
Cisco NX-OS Release 6.0(2)A1(1d) does not include new hardware.
New Software Features
Cisco Nexus 3548 switches are supported by Cisco NX-OS Release 6.0(2)A1(1d). Cisco NX-OS interoperates with any networking operating system, including Cisco IOS software, that conforms to the networking standards listed in the product data sheet.
Cisco NX-OS Release 6.0(2)A1(1d) includes the following new software features:
You can now detect QoS packet drops on a specified interface or on all interfaces every 5 seconds, and display the log of the results by using the following command:
switch# show interface [type slot/port] queuing-drop history [brief | detail] [all | unicast | multicast]
You can also clear the drop counter history by using the existing clear qos statistics command.
PIM Multicast Border Router
The PIM Border Router feature enables a device to act as the first hop router for a source that is not on a directly connected subnet. This effectively enables the forwarding of traffic from outside a PIM sparse-mode domain into the domain. You can enable this feature by running the ip pim border-router command on the interface where multicast traffic from the remote source arrives. The device acts as a first hop router by sending PIM register messages to the PIM rendezvous point (RP). When forming the Register packets, the border-bit in the Register header will be set.
HSRP and VRRP are now supported on NAT interfaces.
MAC Address Learning on Layer 2 Interfaces
You can now disable MAC address learning on Layer 2 interfaces by using the following command:
switch(config-if)# switchport mac-learn disable
You can also re-enable MAC address learning on Layer 2 interfaces by using the following command:
switch(config-if)# no switchport mac-learn disable
After disabling MAC address learning on an interface, ensure that you clear the MAC address table for that interface by using the following command:
switch(config-if)# clear mac address-table dynamic interface type slot/port
To verify the mac-learn status of an interface, use the following command:
switch# show interface type slot/port switchport
To verify the mac-learn config on interface, use the following command:
switch# show running-config interface type slot/port
Upgrade and Downgrade Guidelines
Upgrade Path to Cisco NX-OS Release 6.x
If a custom CoPP policy is applied after upgrading to Cisco NX-OS Release 6.0(2)A1(1) or later, and if the Nexus 3548 switch is downgraded to Cisco NX-OS Release 5.0, where changes to the CoPP policy are not permitted, the custom CoPP policy is retained and cannot be modified.
There are no known limitations for Cisco NX-OS Release 6.0(2)A1(1d).
Open and resolved caveat record numbers are provided with links to the Bug Search page where you can find details about each caveat.
The Cisco Management Information Base (MIB) list includes Cisco proprietary MIBs and many other Internet Engineering Task Force (IETF) standard MIBs. These standard MIBs are defined in Requests for Comments (RFCs). To find specific MIB information, you must examine the Cisco proprietary MIB structure and related IETF-standard MIBs supported by the Cisco Nexus 3548 switch. The MIB Support List is available at the following FTP sites:
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