Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 35
When DCB is Disabled Default, When DCB is Enabled
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When DCB is Disabled (Default) By default, Aggregator interfaces operate with DCB disabled and linklevel flow control enabled. When an interface comes up, it is automatically configured with: • Flow control enabled on input interfaces. • A DCB-MAP policy is applied with PFC disabled. The following example shows a default interface configuration with DCB disabled and link-level flow control enabled. show interfaces Command Example: DCB disabled and Flow Control enabled Dell#show running-config interface te 0/4 ! interface TenGigabitEthernet 0/4 mtu 12000 portmode hybrid switchport auto vlan flowcontrol rx on tx off dcb-map DCB_MAP_PFC_OFF ! protocol lldp advertise management-tlv management-address system-name dcbx port-role auto-downstream no shutdown Dell# When DCB is Enabled When an interface receives a DCBx protocol packet, it automatically enables DCB and disables link-level flow control. The dcb-map and flow control configurations are removed as shown in the following example. show interfaces Command Example: DCB enabled and Flow Control disabled Dell#show running-config interface te 0/3 ! interface TenGigabitEthernet 0/3 mtu 12000 portmode hybrid switchport auto vlan ! protocol lldp advertise management-tlv management-address system-name dcbx port-role auto-downstream no shutdown Dell# When no DCBx TLVs are received on a DCB-enabled interface for 180 seconds, DCB is automatically disabled and flow control is re-enabled. Lossless Traffic Handling In auto-DCB-enable mode, Aggregator ports operate with the auto-detection of DCBx traffic. At any moment, some ports may operate with link-level flow control while others operate with DCB-based PFC enabled. As a result, lossless traffic is ensured only if traffic ingresses on a PFC-enabled port and egresses on another PFC-enabled port. Data Center Bridging (DCB) 35