Data Center Bridging (DCB) Configuration Terms and Definitions lists terms and definitions used in this DCB configuration discussion.
Data Center Bridging (DCB) Configuration Terms and Definitions
| Term | Definition |
|---|---|
| Application Priority | A DCB feature that provides for the advertisement to the peer of a preferred priority to be applied to frames carrying application-specific traffic. The peer must support the LLDP willing bit. |
| Congestion Notification (CN) | A DCB feature, as defined in IEEE 802.1Q-2011, that allows a device to detect congestion at a switch congestion point and transmit a Congestion Notification Message back to the reaction point indicating the reaction point should back off the traffic for that flow (S-, 7100-Series). |
| Congestion Notification Message (CNM) | A PDU message sent from the congestion point back to the reaction point to back off on a transmitting the flow when congestion is detected in a congestion notification enabled context (S-, 7100-Series). |
| congestion point | An egress transmit point configured for congestion notification (S-, 7100-Series). |
| Data Center Bridging (DCB) | A group of features that enhance Ethernet technology by enabling the convergence of various applications in data centers, such as Local Area Networks (LAN), Storage Area Networks (SAN), and advanced application High Performance Computing (HPC) onto a single interconnect technology, by providing enhancements to existing 802.1 bridge specifications. |
| Data Center Bridging Exchange (DCBX) | A protocol that allows Ethernet devices to detect DCB capability on the peer device, as well as DCB configuration between peer devices. |
| Enhanced Transmission Selection (ETS) | A DCB feature that provides a common management framework for assignment of bandwidth to 802.1p CoS-based traffic classes (IEEE 802.1Qaz). |
| LLDP willing bit | An LLDP attribute that when enabled instructs the local device to use the peer Application Priority settings contained in received TLVs. The LLDP willing bit is not currently supported on Extreme Networks switches. |
| Priority-based Flow Control (PFC) | A DCB feature that provides a link level flow control mechanism that can be controlled independently for each Class of Service (CoS), with a goal of ensuring zero loss under congestion in DCB networks (IEEE 802.1Qbb) (7100-Series). |
| priority or port-priority choice | The method used to select the domain defense either globally (priority) or on a port-basis (port-priority). Both global and port-based choice supports auto or administrative selection of the domain defense. On a port-basis, domain defense selection can be set to the default creation value set when the CNPV was created (7100-Series). |
| reaction point | The flow source device capable of optionally adding a CN-TAG to the flow, has the ability to process a CNM PDU, and is able to throttle its transmission rates based on information contained in the CNM PDU (S-, 7100-Series). |
Print
this page
Email this topic
Feedback
View PDF
Download EPUB