Installation guide

SPECIFICATION

OPERATING

NON-OPERATING

Vibration

0.20G in all axes, 5-500 Hz sine

1.0G in all axes, 5–500 Hz sine

Shock

5G, 11 ms half-sine

30G 11 ms half-sine

Appendix D: Data Center Bridging Technology

The following descriptions of Enhanced Ethernet were taken from Ethernet: The Converged Network Ethernet Alliance

Demonstration which was presented at the Super Computing 2009 (SC09) conference and published by the Ethernet

Alliance in November, 2009.

Data Center Bridging (DCB)

For Ethernet to carry LAN, SAN and IPC traffic together and achieve network convergence, some necessary

enhancements are required. These enhancement protocols are summarized as data center bridging (DCB)

protocols, also referred to as Enhanced Ethernet (EE), which are defined by the IEEE 802.1 data center bridging

task group. A converged Ethernet network is built based on the following DCB protocols:

 DCBX and ETS

 Priority Flow Control

 Fibre Channel over Ethernet (FCoE)

 iSCSI

DCBX and ETS

Existing Ethernet standards cannot control and manage the allocation of network bandwidth to different network

traffic sources and types (traffic differentiation). Neither can existing standards allow prioritizing of bandwidth

usage across these sources and traffic types. Data center managers must over-provision network bandwidth for

peak loads, accept customer complaints during these periods, or manage traffic on the source side by limiting the

amount of non-priority traffic entering the network.

Overcoming these limitations is a key to enabling Ethernet as the foundation for true converged data center

networks supporting LAN, storage, and interprocessor communications.

Enhanced Transmission Selection (ETS) protocol addresses the bandwidth allocation issues among various traffic

classes to maximize bandwidth usage. The IEEE 802.1Qaz standard specifies the protocol to support allocation of

bandwidth among priority groups. ETS allows each node to control bandwidth per priority group. When the actual

load in a priority group does not use its allocated bandwidth, ETS allows other priority groups to use the available

bandwidth. The bandwidth-allocation priorities allow the sharing of bandwidth between traffic loads, while

satisfying the strict priority mechanisms already defined in IEEE 802.1Q that require minimum latency.

Bandwidth allocation is achieved as part of a negotiation process with link peers—this is called DCB Capability

eXchange protocol (DCBX). It provides a mechanism for Ethernet devices (bridges, end stations) to detect the

DCB capability of a peer device. It also allows configuration and distribution of ETS parameters from one node to

another.