Administrator Guide

Figure 35. DCBx Sample Topology
DCBx Prerequisites and Restrictions
The following prerequisites and restrictions apply when you configure DCBx operation on a port:
● For DCBx, on a port interface, enable LLDP in both Send (TX) and Receive (RX) mode (the protocol lldp mode
command; refer to the example in in the chapter). If multiple DCBx peer ports are detected on a local DCBx interface, LLDP
is shut down.
● The CIN version of DCBx supports only PFC, ETS, and FCOE; it does not support iSCSI, backward congestion management
(BCN), logical link down (LLDF), and network interface virtualization (NIV).
Configuring DCBx
To configure DCBx, follow these steps.
For DCBx, to advertise DCBx TLVs to peers, enable LLDP. For more information, refer to .
1. Configure ToR- and FCF-facing interfaces as auto-upstream ports.
2. Configure server-facing interfaces as auto-downstream ports.
3. Configure a port to operate in a configuration-source role.
4. Configure ports to operate in a manual role.
1. Enter INTERFACE Configuration mode.
CONFIGURATION mode
interface type slot/port
2. Enter LLDP Configuration mode to enable DCBx operation.
INTERFACE mode
[no] protocol lldp
3. Configure the DCBx version used on the interface, where: auto configures the port to operate using the DCBx version
received from a peer.
PROTOCOL LLDP mode
[no] DCBx version {auto | cee | cin | ieee-v2.5}
● cee: configures the port to use CEE (Intel 1.01).
● cin: configures the port to use Cisco-Intel-Nuova (DCBx 1.0).
● ieee-v2.5: configures the port to use IEEE 802.1Qaz (Draft 2.5).
The default is Auto.
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Data Center Bridging (DCB)