Bfd (Bidirectional Forwarding Detection); Networking Of Reliability Over An Ip Network; Failures On Intermediate Nodes Or On The Link Between Pes - Ldp Frr/Te Frr - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
On Ethernet enabled with multicast or broadcast, VRRP offers logical gateways to ensure highly
available link. This solves the problem that services are interrupted because of a gateway
router failure, without changing the configuration of routing protocol.

1.3.4 BFD (Bidirectional Forwarding Detection)

As a unified detection mechanism on an entire network, BFD can fast detect network faults,
minimize the impact of device faults on services, and improve availability of a network.
BFD is a set of entire-network applicable detection mechanisms. It is used to detect and monitor
the connectivity of a link or an IP route during forwarding packets. To improve the network
performance, a communication failure between adjacent systems must be detected quickly and
the standby channel must be created faster for communication recovery.
The BFD features are as follows:
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1.4 Networking of Reliability over an IP Network

This section describes FRR applicable scenarios and FRR solutions.
1.4.1 Failures on Intermediate Nodes or on the Link Between PEs -
LDP FRR/TE FRR
In LDP or TE FRR, when transmission devices exist between P devices, BFD or OAM can be
used to detect links that transmit traffic.
Figure 1-2 Networking diagram of LDP/TE FRR application
PE1
PE2
As shown in
QoS between P devices. This network deployment enhances the QoS across the entire network
Issue 02 (2011-09-10)
Detecting channel failures between adjacent forwarding engines with light load in a short
time
Detecting any media and any protocol layer with single mechanism in real time and
supporting different detection time and costs
P1
Figure 1-2, LDP LSP serves as a public network tunnel and TE is enabled with
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P3
P2
1 Reliability Overview
PE3
PE4
8