Dcbx Example; Dcbx Prerequisites And Restrictions; Configuring Dcbx - Dell S4048–ON Configuration Manual

DCBx Example

The following figure shows how to use DCBx.
The external 40GbE 40GbE ports on the base module (ports 33 and 37) of two switches are used for uplinks configured as DCBx auto-
upstream ports. The device is connected to third-party, top-of-rack (ToR) switches through 40GbE uplinks. The ToR switches are part of a
Fibre Channel storage network.
The internal ports (ports 1-32) connected to the 10GbE backplane are configured as auto-downstream ports.
On the S4048, PFC and ETS use DCBx to exchange link-level configuration with DCBx peer devices.
Figure 30. 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
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
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.
in the Link Layer Discovery Protocol (LLDP)
Link Layer Discovery Protocol
Data Center Bridging (DCB)
chapter). If
(LLDP).
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