Reference Guide

b. Apply Policy-map configuration. Configure the policy-map ‘policy-dscp-based-pfc’ on the
server connected untagged ports.
Dell(conf)#int te 0/0
Dell(conf-if-te-0/0)#service-policy input policy-dscp-based-pfc
c. Apply PFC Priority configuration. Configure priorities on which PFC is enabled.
Dell(conf-if-te-0/0)#pfc priority 1,2
DCBx Example
The following figure shows how to use DCBx.
The external 40GbE ports on the base module (ports 33 and 37) of two switches are used for uplinks
configured as DCBx auto-upstream ports. The 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 , PFC and ETS use DCBx to exchange link-level configuration with DCBx peer devices.
Figure 33. 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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