Configuration manual

interface type slot/port
7. Apply the QoS output policy with the bandwidth percentage for specified priority queues to an
egress interface.
INTERFACE mode
service-policy output output-policy-name
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:
• Configuring Priority-Based Flow Control
• Configure Enhanced Transmission Selection
• Configuring FIP Snooping
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.
DCBx Port Roles
To enable the auto-configuration of DCBx-enabled ports and propagate DCB configurations learned
from peer DCBx devices internally to other switch ports, use the following DCBx port roles.
Auto-upstream The port advertises its own configuration to DCBx peers and receives its
configuration from DCBX peers (ToR or FCF device). The port also propagates its
configuration to other ports on the switch.
The first auto-upstream that is capable of receiving a peer configuration is elected
as the configuration source. The elected configuration source then internally
propagates the configuration to other auto-upstream and auto-downstream ports.
FC Flex IO Modules
1003