Bfd Configuration; Introduction To Bfd; How Bfd Works - H3C LS-3100-52P-OVS-H3 Operation Manual

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BFD Configuration

When configuring BFD, go to these sections for information you are interested in:

Introduction to BFD

BFD Configuration Task List
Configuring BFD Basic Functions
Configuring Protocol-based BFD
Enabling Trap
Displaying and Maintaining BFD
BFD Configuration Examples
The term "router" or router icon in this document refers to a router in a generic sense or an Ethernet
switch running routing protocols.
S5500-EI series switches are centralized devices that support IRF. Multiple S5500-EI switches can
form a distributed chassis switch in a logical sense, in which the master and slave switches are like
the master and slave boards of a distributed switch. The centralized S5500-EI series switches are
implemented in a distributed way after they form an IRF stack.
Introduction to BFD
Bidirectional forwarding detection (BFD) provides a single mechanism to quickly detect and monitor the
connectivity of links in networks. To improve network performance, devices must quickly detect
communication failures to restore communication through backup paths as soon as possible. Normally,
devices in a network may employ the following detection methods:
Detect link failures by sending hardware detection signals, such as SDH (synchronous digital
hierarchy) transmission system alarms.
If no hardware detection signals are provided or failures cannot be detected through hardware
detection signals, devices can use the hello mechanism of a routing protocol for failure detection,
which has a slower failure detection rate of more than one second. In Gigabit data transmission,
such a rate will cause a large quantity of data to be dropped.
Implement real-time detection for all media types and protocols through a uniform mechanism.

How BFD Works

BFD provides a general-purpose, standard, medium- and protocol-independent fast failure detection
mechanism. It can uniformly and quickly detect the failures of the bidirectional forwarding paths
between two routers for protocols, such as routing protocols and Multiprotocol Label Switching (MPLS).
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