Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 282
Con a DCBx Operation, DCBx Operation
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• Apply the specified DCB output policy on all ports of the switch stack or a stacked switch. CONFIGURATION mode dcb-policy output stack-unit {all | stack-unit-id} stack-ports all dcboutput-policy-name Entering this command removes all DCB input policies applied to stacked ports. A dcb-policy output stack-unit all command overwrites any previous dcb-policy output stack-unit stack-unit-id configurations. Similarly, a dcb-policy output stack-unit stackunit-id command overwrites any previous dcb-policy output stack-unit all configuration. Entering the no dcb-policy output stack-unit all command removes all DCB output policies applied to stacked ports. The no dcb-policy output stack-unit stack-unit-id command removes only the DCB output policy applied to the specified switch. Configure a DCBx Operation DCB devices use data center bridging exchange protocol (DCBx) to exchange configuration information with directly connected peers using the link layer discovery protocol (LLDP) protocol. DCBx can detect the misconfiguration of a peer DCB device, and optionally, configure peer DCB devices with DCB feature settings to ensure consistent operation in a data center network. DCBx is a prerequisite for using DCB features, such as priority-based flow control (PFC) and enhanced traffic selection (ETS), to exchange link-level configurations in a converged Ethernet environment. DCBx is also deployed in topologies that support lossless operation for FCoE or iSCSI traffic. In these scenarios, all network devices are DCBx-enabled (DCBx is enabled end-to-end). For more information about how these features are implemented and used, refer to: • Configure Enhanced Transmission Selection DCBx supports the following versions: CIN, CEE, and IEEE2.5. Prerequisite: For DCBx, enable LLDP on all DCB devices. DCBx Operation DCBx performs the following operations: • Discovers DCB configuration (such as PFC and ETS) in a peer device. • Detects DCB mis-configuration in a peer device; that is, when DCB features are not compatibly configured on a peer device and the local switch. Mis-configuration detection is feature-specific because some DCB features support asymmetric configuration. • Reconfigures a peer device with the DCB configuration from its configuration source if the peer device is willing to accept configuration. • Accepts the DCB configuration from a peer if a DCBx port is in "willing" mode to accept a peer's DCB settings and then internally propagates the received DCB configuration to its peer ports. 282 Data Center Bridging (DCB)
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