Huawei NetEngine80E Configuration Manual - Reliability page 336

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
BFD for
everything
BFD for RIP
BFD for BGP
Issue 02 (2014-09-30)
Usage Scenario
Generally, RIP uses timers to
receive and send Update messages
to maintain neighbor relationships.
If a RIP device does not receive an
Update message from a neighbor
after the Age timer expires, the RIP
device will announce that this
neighbor goes Down. The default
value of the Age timer is 180s. If a
link fault occurs, RIP can detect this
fault after 180s. If high-rate data
services are deployed on a network,
a great deal of data will be lost
during the aging time. BFD
provides millisecond-level fault
detection. It can rapidly detect faults
in protected links or nodes and
report them to RIP. This speeds up
RIP processes' response to network
topology changes and achieves
rapid RIP route convergence.
As technologies develop, voice and
video services are widely applied.
These services are quite sensitive to
the packet loss and delay. BGP
periodically sends Keepalive
packets to its peers to detect the
status of its peers. The detection
mechanism, however, takes more
than one second. When the data
transmission rate reaches the level
of Gbit/s, such slow detection will
cause a large amount of data to be
lost. As a result, the requirement for
high reliability of carrier-class
networks cannot be met.
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5 BFD Configuration
Configuration Reference
Configuring Static BFD for RIP
Configuring BFD for RIP
Configuring BFD for BGP
319