636 | Layer 2w w w . d e l l . c o m | s u p p o r t . d e l l . c o mFar-end Failure DetectionFar-end Failure Detection is supported on platforms e ZFar-end Failure Detection (FEFD) is a protocol that senses remote data link errors in a network. It respondsby sending a unidirectional report that triggers an echoed response after a specified time interval. FEFDcan be enabled globally or locally on an interface basis. Disabling the global FEFD configuration does notdisable the interface configuration.Figure 29-10. Configuring Far-end Failure DetectionThe report consists of several packets in SNAP format that are sent to the nearest known MAC address.In the event of a far-end failure, the device stops receiving frames, and after the specified time interval,assumes that the far-end is not available. The connecting line protocol is brought down so that upper layerprotocols can detect the neighbor unavailability faster.FTOS(conf-if-gi-4/0)#show config!interface GigabitEthernet 4/0no ip addressswitchportfefdno shutdown FTOS(conf-if-gi-1/0)#show config!interface GigabitEthernet 1/0no ip addressswitchportfefdno shutdownR1 R22w0d4h : FEFD packet sent via interface Gi 1/0Sender state -- Bi-directionalSender info -- Mgmt Mac(00:01:e8:14:89:25), Slot-Port(Gi 1/0)Peer info -- Mgmt Mac (00:01:e8:14:89:25), Slot-Port(Gi 4/0)Sender hold time -- 3 (second)R1 R22w0d4h : FEFD packet sent via interface Gi 4/0Sender state -- Bi-directionalSender info -- Mgmt Mac(00:01:e8:14:89:25), Slot-Port(Gi 4/0)Peer info -- Mgmt Mac (00:01:e8:14:89:25), Slot-Port(Gi 1/0)Sender hold time -- 3 (second)Keep-aliveEchoIntervalLayer2 001
