Huawei NetEngine80E Configuration Manual - Reliability page 27

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HUAWEI NetEngine80E/40E Router

Configuration Guide - Reliability

Figure 1-3 Networking diagram of MPLS OAM protecting switchover

forming a protection group. A TE tunnel is created between PE2 and PE1 through P1 as a reverse

channel, advertising a failure to ingress PE1.

BFD and OAM are similar because both of them define a set of mechanisms including detection,

failure report, and switchover. For BFD and OAM, the detection is carried out by sending fast

detection packets through a preset path to detect the link status. If the detection packets cannot

pass through the link, the packets are dropped. To avoid the jitters, the number of detection

packets is specified. When the number of the lost detection packets reaches the set value, the

link is considered as interrupted.

BFD is a bidirectional detection mechanism, and its detection packets are sent bidirectionally.

If one end does not receive the detection packets within a specified period, the end assumes that

the link is interrupted and reports to related modules to perform switchover.

Issue 02 (2011-09-10)

1-3, two TE tunnels are created between the ingress PE1 and egress PE2,

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1 Reliability Overview

Netengine40e