Data Center Bridging Exchange Protocol (Dcbx); Data Center Bridging In A Traffic Flow - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Bandwidth allocated by the ETS algorithm is made available after strict-priority groups are serviced. If

a priority group does not use its allocated bandwidth, the unused bandwidth is made available to other

priority groups.

For ETS traffic selection, an algorithm is applied to priority groups using:

Strict-priority shaping

Credit-based shaping is not supported.

ETS uses the DCB MIB IEEE 802.1azd2.5.

Data Center Bridging Exchange Protocol (DCBx)

The data center bridging exchange (DCBx) protocol is disabled by default on the S4810 and S4820T; ETS

is also disabled. DCBx allows a switch to automatically discover DCB-enabled peers and exchange

configuration information. PFC and ETS use DCBx to exchange and negotiate parameters with peer

devices. DCBx capabilities include:

Discovery of DCB capabilities on peer-device connections

Determination of possible mismatch in DCB configuration on a peer link

Configuration of a peer device over a DCB link

DCBx requires the link layer discovery protocol (LLDP) to provide the path to exchange DCB parameters

with peer devices. Exchanged parameters are sent in organizationally specific type, length, values (TLVs)

in LLDP data units. For more information, refer to

The following LLDP TLVs are supported for DCB parameter exchange:

PFC parameters: PFC Configuration TLV and Application Priority Configuration TLV.

ETS parameters: ETS Configuration TLV and ETS Recommendation TLV.

The following figure shows how DCB handles a traffic flow on an interface.

Chapter 29, Link Layer Discovery Protocol

Data Center Bridging (DCB) | 305