Deployment Guide

Table Of Contents
DCBx Example
The following figure shows how to use DCBx.
The device is connected to third-party, top-of-rack (ToR) switches through 40GbE or 10GBE uplinks. The ToR switches are part
of a Fibre Channel storage network. The ports connected to the server with CNA are configured as auto-downstream ports.
Figure 31. 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 CONFIGURATION versus INTERFACE Configurations in the Link Layer Discovery Protocol
(LLDP) 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).
Data Center Bridging (DCB)
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