Huawei NetEngine80E Configuration Manual - Reliability page 334

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
BFD for
everything
BFD for Static
Route
BFD for IS-IS
Issue 02 (2014-09-30)
Usage Scenario
BFD can quickly detect IP
forwarding failures, ensuring QoS
for voice, video, and other video-
on-demand (VoD) services on an IP
network. With BFD, service
providers can provide voice over IP
(VoIP) and other real-time services
with high availability and
scalability. By binding IP static
routes to BFD sessions, you can use
BFD sessions to provide link
detection for IP static routes on the
public network. A static route can
be bound to a BFD session.
Connection status between an IS-IS
device and its neighbors can be
monitored by exchanging Hello
packets at intervals. The minimum
allowable sending interval is 3s, and
a neighbor is declared Down after at
least three intervals during which no
response Hello packet is received
from the neighbor. IS-IS takes more
than one second to detect that a
neighbor becomes Down, resulting
in loss of a large amount of high-
speed data. To solve this problem,
BFD must be configured for IS-IS.
IPv4 BFD provides millisecond-
level fault detection. After detecting
a link or node failure, BFD will
notify IS-IS of the failure,
accelerating the IS-IS route
convergence speed.
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Copyright © Huawei Technologies Co., Ltd.
5 BFD Configuration
Configuration Reference
Configuring BFD for IPv4 Static
Routes on the Public Network
Configuring BFD for IPv6 Static
Routes on the Public Network
Configuring Static BFD for IPv4
IS-IS
Configuring Dynamic BFD for
IPv4 IS-IS
Configuring Dynamic BFD for
IPv6 IS-IS
317