Fault Information Advertisement Between Efm And Other Modules - Huawei AR530 Series Configuration Manual

Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Reliability
After remote loopback is enabled, the device discards all the non-OAMPDUs, causing service
interruption. It is recommended that you enable remote loopback to check link connectivity and
quality before a new network is used or a link fault is rectified. The results help an operator take
measures to minimize the remote loopback impact on services.
The local device computes communication quality parameters such as the packet loss ratio on
the current link based on the number of sent packets and the number of received packets.
7-5
Figure 7-5 Remote loopback process
4: Enter the
loopback state
7: Compare the
number of sent
test packets with
the number of
received test
packets and
check the link
status
If the local device attempts to stop remote loopback, it sends a message to instruct the remote
device to disable remote loopback. After receiving the message, the remote device disables
remote loopback.
If remote loopback is left enabled, the remote device keeps looping back service data, causing
a service interruption. To prevent this problem, a capability can be configured to disable remote
loopback automatically after a specified timeout interval. After the timeout interval expires, the
local device automatically sends a message to instruct the remote device to disable remote
loopback.
7.2.3 Fault Information Advertisement Between EFM and Other
Modules
Issue 01 (2014-11-30)
shows the remote loopback process.
CE
Active
mode
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7 EFM Configuration
PE1
2: After receiving the
OAMPDU, PE1
determines whether
to enter the loopback
state. If not, PE1
discards the
Loopback Control
OAMPDU and
forwards data frames
on demand. If so, PE1
stops forwarding data
frames. Go to step 3.
Figure
269