Huawei AR530 Series Configuration Manual page 281

Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Reliability
Fault Information Advertisement Between EFM and Detection Modules
The OAMMGR module associates EFM with detection modules. The detection modules can be
bidirectional forwarding detection (BFD) and interface.
fault information is advertised between EFM and detection modules.
Figure 7-6 Fault information advertisement between EFM and detection modules
The following example illustrates fault information advertisement between EFM and detection
modules over the path CE5 -> CE4 -> CE1 -> PE2 -> PE4, as described in
Table 7-6 Fault information advertisement between EFM and detection modules
Function
Deployment
EFM is configured
to monitor a direct
link between CE1
and CE4.
Issue 01 (2014-11-30)
DSLAM CE5
User
Network
EFM
Issue to Be Resolved
Although EFM detects a fault on
a direct link between CE1 and
CE4, PE2 cannot detect this
fault. As a result, network-side
traffic is still sent to CE4,
causing a traffic interruption.
Although Port1 on CE1 goes
Down, Port1 cannot notify CE4
of the fault. As a result, CE4 still
forwards user traffic to CE1,
causing a traffic interruption.
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CE3
CE1
CE4
Port1
EFM
EFM
7 EFM Configuration
Figure 7-6 shows the network on which
PE5
PE1 PE3
PE2 PE4
BFD
Solution
EFM and Port1 are associated with
each other. If a fault occurs, traffic
switches to a standby link between
CE1 and CE5.
l If EFM detects a fault on a direct
link between CE1 and CE4,
EFM instructs the OAMMGR
module to notify Port1 of the
fault. After receiving the
notification, Port1 changes its
physical status to TRIGGER
DOWN (3AH).
l If Port1 goes Down, it instructs
the OAMMGR module to
notify the EFM module of the
fault. After receiving the
notification, EFM notifies CE4
of the fault.
IP/MPLS
PE6
Table 7-6.
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