On the S4048, PFC and ETS use DCBx to exchange link-level configuration with DCBx peer devices.
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 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).
Configuring DCBx
To configure DCBx, follow these steps.
For DCBx, to advertise DCBx TLVs to peers, enable LLDP. For more information, refer to
Link Layer Discovery Protocol (LLDP).
Configure DCBx operation at the interface level on a switch or globally on the switch. To configure the S4810
system for DCBx operation in a data center network, you must:
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.
Data Center Bridging (DCB) 323
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