Setup Guide
Important Points about Conguring Redundant Pairs
• You may not congure any interface to be a backup for more than one interface, no interface can have more than one backup, and a
backup interface may not have a backup interface.
• The active or backup interface can be a LAG, but it cannot be a member port of a LAG.
• The active and standby do not have to be of the same type (1G, 10G, and so on).
• You may not enable any Layer 2 protocol on any interface of a redundant pair or to ports connected to them.
Example of Conguring Redundant Layer 2 Pairs
Example of Conguring Redundant Pairs on a Port-Channel
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 specied time interval. You can enable FEFD globally or locally on an interface basis.
Disabling the global FEFD conguration does not disable the interface conguration.
Figure 73. Conguring 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 specied 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.
Layer 2
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