Huawei NetEngine80E Configuration Manual - Reliability page 337

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
BFD for
everything
BFD for BGP4+
BFD for LSP
BFD for LDP
LSP
BFD for LDP
Tunnel
BFD for BGP
Tunnel
Issue 02 (2014-09-30)
Usage Scenario
BFD can rapidly detect IPv6
forwarding failures. By adopting
the BFD fast detection mechanism,
an IPv6 network can transmit voice
services, video services, and VoD
services with high QoS. This
enables service provides to provide
their customers with highly
available and reliable Voice over
Internet Protocol(VoIP) and other
real-time services. BGP
periodically sends Keepalive
messages to the peer to detect faults
on the neighbor. This mechanism,
however, takes more than one
second to detect a fault. When the
data rate is up to Gbit/s, the
detection mechanism causes a great
packet loss. This mechanism fails to
meet the requirement on the
reliability of core networks.
BFD is used to monitor the
connectivity of the static LSP that is
established manually.
With BFD for LDP LSP, failure
detection speeds up and the
workload of configuring decreases.
In addition, LDP FRR is well
supported for the LSP for providing
better services.
Dynamic BFD can be configured to
establish a dynamic BFD session to
monitor both primary and backup
LDP LSPs in an LDP tunnel. If BFD
detects a fault, BFD instructs a
specific LDP upper-layer
application to perform a protection
switchover.
BFD for BGP tunnel rapidly detects
faults in E2E BGP tunnels.
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5 BFD Configuration
Configuration Reference
Configuring BFD for BGP4+
Configuring Static BFD for Static
LSP
Configuring Static BFD for LDP
LSP
Configuring Dynamic BFD for
LDP LSP
Configuring Dynamic BFD to
Monitor an LDP Tunnel
Configuring Dynamic BFD to
Monitor a BGP Tunnel
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