D-Link DXS-3400 Emulator - Page 729

DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch CLI Reference Guide Parameters None. Default By default, this option is disabled. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline PFC, which is defined in IEEE 802.1Qbb, extends the basic IEEE 802.3x pause semantics and uses the IEEE 802.1p CoS values in the IEEE 802.1Q VLAN tag to differentiate up to eight CoSs that can be subject to flow control independently. The following is a procedure to enable PFC on a priority basis. • Use the class-map type network-qos global configuration command to create a type network-QoS class map. • Use the match cos class-map configuration command to specify which priorities to configure. • Use the policy map type network-qos command to create a type network QoS policy map. • Use the class type network-qos policy-map configuration command to specify a type network QoS class map to be associated with a traffic policy. • Use the pause policy map type network-qos class configuration command to enable the PFC pause characteristics on a class referenced in a type network QoS policy map. • Use the service-policy interface configuration command to apply a type network QoS policy map. If the PFC of all priorities is disabled on an interface, the interface defaults to the IEEE 802.3x flow control setting. When the PFC of any priority is enabled, the interface will pause a CoS on which the PFC is enabled and a pause frame for that CoS is received. Meanwhile, a pause frame will be transmitted if congestion is detected on the PFC enabled CoS. This command is used to turn on the DCBX PFC willing feature that indicates that the local port is willing to accept PFC configurations from a remote system. Enable the Switch to transmit LLDP DCBX PFC TLVs to advertise the PFC setting per-CoS and negotiate with the peer to take the PFC willing feature into effect. Example This example shows how to turn on the DCBX PFC willing bit on the ethernet 1/0/3. Switch# configure terminal Switch(config)# interface ethernet 1/0/3 Switch(config-if)# priority-flow-control willing Switch(config-if)# 77-3 show interfaces priority-flow-control This command is used to display PFC information of an interface. 725