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Features and Benefits

The Cisco Nexus 5000 Series' rich feature set makes it ideal for top-of-rack, middle-of-row, or end-of-row access-

layer applications. It protects investments in data center racks with standards based 10 Gigabit Ethernet and FCoE

features, and virtual machine awareness features that allow IT departments to consolidate networks based on their

own requirements and timing. The combination of high port density, lossless Ethernet, wire-speed performance, and

extremely low latency makes the switch family ideal for meeting the growing demand for 10 Gigabit Ethernet that can

support unified fabric in enterprise and service provider data centers, protecting enterprises' investments. The switch

family has sufficient port density to support single and multiple racks fully populated with blade and rack-mount

servers.

Built for today's data centers, the switches are designed just like the servers they support. Ports and power

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connections are at the rear, closer to server ports, helping keep cable lengths as short and efficient as

possible, delivering benefits traditionally offered on blade servers to rack servers as well. Hot-swappable

power and fan modules can be accessed from the front panel, where status lights offer an at-a-glance view of

switch operation. Front-to-back cooling is consistent with server designs, supporting efficient data center hot-

and cold-aisle designs. Serviceability is enhanced with all customer-replaceable units accessible from the

front panel. The use of SFP+ ports offers increased flexibility, enabling use of a range of interconnect

solutions, including copper Twinax cable for short runs and fiber for long runs.

IEEE DCB enables Ethernet fabrics to support lossless transmission to increase network scalability, support

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I/O consolidation, ease management of multiple traffic flows, and optimize performance. Although

implementing SAN consolidation requires only the lossless fabric provided by the Ethernet pause

mechanism, the Cisco Nexus 5000 Series provides additional features that create an even more easily

managed, high-performance, unified network fabric. The IEEE DCB and related standards summarized in

Table 3 are supported by the Cisco Nexus 5000 Series Switches.

Table 3.

Feature

Priority Flow Control (PFC): IEEE

802.1Qbb

Enhanced Transmission Selection: IEEE

802.1Qaz

Data Center Bridging Exchange (DCBX)

Protocol: IEEE 802.1AB

Congestion Notification: IEEE 802.1Qau

FCoE is a standards-based upper-layer protocol that maps the Fibre Channel Protocol (FCP) and services

●

onto Layer 2 Ethernet. It is a straightforward encapsulation of Fibre Channel within Ethernet that preserves

existing Fibre Channel network management models and tools, helping protect investments in software and

staff training.

Cisco unified fabric consolidates all data center I/O onto Layer 2 Ethernet. Unified fabric reduces capital and

●

operating costs by reducing the number of server adapters, cables, and upstream switches needed. All I/O

(LAN, SAN, and cluster) typically is consolidated onto two Ethernet links. IEEE DCB and FCoE enable the

incorporation of Fibre Channel frames into a unified fabric, facilitating wire-once strategies in which all servers

become capable of SAN connection. A standard and uniform approach to I/O enhances server and storage

consolidation strategies. The Cisco Nexus 5000 Series also connects to existing native Fibre Channel

networks, protecting current investments in storage networks. Additionally, the Cisco Nexus 5000 Series

IEEE DCB Features and Benefits

Business Benefit

● Simplifies management of multiple traffic flows over a single network link

● Creates lossless behavior for Ethernet by allowing class-of-service (CoS)-based flow control

Enables consistent management of quality of service (QoS) at the network level by providing consistent

scheduling of different traffic types (IP, storage, etc.)

Simplifies network deployment and reduces configuration errors by providing autonegotiation of IEEE

DCB features between the NIC and the switch and between switches

Pushes congestion to network edges, providing better control over QoS; the Cisco Nexus 5000 Series

hardware supports a precursor to IEEE 802.1Qau called Backward Congestion Notification (BCN),

which will be made available based on availability of other system components, such as adapters and

core switches and routers

Data Sheet

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