Configuration manual

Step Task Command Command Mode

Apply the DCB map, created to disable the

PFC operation, on the interface

dcb-map {name |

default}

INTERFACE

Configure the port queues that still function

as no-drop queues for lossless traffic.

The maximum number of lossless queues

globally supported on a port is 2.

You cannot configure PFC no-drop queues

on an interface on which a DCB map with

PFC enabled has been applied, or which is

already configured for PFC using the pfc

priority command.

Range: 0-3. Separate queue values with a

comma; specify a priority range with a dash;

for example: pfc no-drop queues 1,3 or pfc

no-drop queues 2-3 Default: No lossless

queues are configured.

pfc no-drop

queuesqueue-range

INTERFACE

Data Center Bridging Exchange Protocol (DCBx)

The data center bridging exchange (DCBx) protocol is disabled by default on any switch on which PFC or

ETS are enabled.

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 TLVs in LLDP data units. For

more information, refer to Link Layer Discovery Protocol (LLDP). 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.

Data Center Bridging (DCB)