Far-End Failure Detection - Dell S6100 Configuration Manual

Apr 9 00:15:13: %STKUNIT0-M:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 2
Apr 9 00:15:13: %STKUNIT0-M:CP %IFMGR-5-STATE_ACT_STBY: Changed interface state to standby: Po 2
Dell(conf-if-po-1)#
Dell#
Dell#show interfaces switchport backup
Interface Status
Port-channel 1 Active
Port-channel 2 Standby
Dell#
Dell(conf-if-po-1)#switchport backup interface tengigabitethernet 1/2/1
Apr 9 00:16:29: %STKUNIT0-M:CP %IFMGR-5-L2BKUP_WARN: Do not run any Layer2 protocols on Po 1
and Te 1/1/1/2
Dell(conf-if-po-1)#

Far-End Failure Detection

Far-end failure detection (FEFD) is a protocol that senses remote data link errors in a network. FEFD responds by sending a unidirectional
report that triggers an echoed response after a specified time interval. You can enable FEFD globally or locally on an interface basis.
Disabling the global FEFD configuration does not disable the interface configuration.
Figure 74. Configuring Far-End Failure Detection
The 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 layer protocols can detect the neighbor unavailability faster.
506 Layer 2
Paired Interface
Port-chato mannel 2
Port-channel 1
Status
Standby
Active