Reference Guide

56 | Data Center Bridging (DCB)

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• A DCB input policy with PFC disabled

• A DCB output policy with ETS disabled

Figure 5-4 shows a default interface configuration with DCB enabled and link-level flow control enabled.

When the first Aggregator interface with DCB disabled receives an LLDP packet with a DCBx TLV

advertisement, DCB is enabled on the interface and on all uplink interfaces.

Figure 5-4. show interfaces Command Example: DCB disabled and Flow Control enabled

When DCB is Enabled

When a server-facing interface receives DCBx protocol packets, it automatically enables DCB and

disables link-level flow control. The DCB input and output policies and the flow control configuration are

removed as shown in Figure 5-5.

When no DCBx TLVs are received on a DCB-enabled interface for 180 seconds, DCB is automatically

disabled and flow control is re-enabled. When all 10GbE server-facing interfaces have DCB disabled,

DCB is also disabled on all 40GbE uplink interfaces.

Figure 5-5. show interfaces Command Example: DCB enabled and Flow Control disabled

FTOS#show interfaces tengigabitethernet 0/2

interface TenGigabitEthernet 0/2

mtu 12000

portmode hybrid

switchport

auto vlan

flowcontrol rx on tx off

dcb-policy input smux-dcb-in

dcb-policy output smux-dcb-out

protocol lldp

advertise management-tlv system-name

dcbx port-role auto-downstream

no shutdown