Huawei NetEngine80E Configuration Manual - Reliability page 696

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
world situations, CC and CV are usually used together. Therefore, these two functions are
integrated on the NE80E/40E. The purpose of CC greatly differs from that of CV. The details
are as follows:
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Perform the following steps on the MEP and RMEP:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
mpls-tp meg
The MEG view is displayed.
Step 3 (Optional) Run the following command as needed:
Ensure that the same CCM transmission interval is set on the MEP and RMEP; otherwise, CC and CV operations
will fail.
l Run the
Issue 02 (2011-09-10)
CC is a pro-active OAM operation. It detects CCMs between the two MEPs (in a MEG) of
a PW built over a bidirectional LSP. A MEP sends CCMs to its RMEP at intervals. If the
RMEP does not receive CCMs within a period 3.5 times the specified interval, it considers
that the connectivity between the two MEPs is faulty and will report an alarm and enter the
Down state. Then, automatic protection switching (APS) will be triggered on both MEPs.
After receiving a CCM from the MEP, the RMEP will clear the alarm and exit from the
Down state.
CV is also a pro-active OAM operation. It enables a MEP to report alarms when receiving
unexpected packets. For example, if a CV-enabled device receives a packet from a PW and
finds that this packet is mistakenly transmitted by the PW, the device will report an alarm
indicating a forwarding error.
Transport networks have strict requirements on data forwarding correctness. In addition,
MPLS-TP requires that the data plane be able to work without IP support, which means
that packet forwarding is based on label switching only. Therefore, the correctness of label-
based forwarding must be guaranteed.
meg-name
NOTE
cc interval interval-value command to configure the interval between CCM
transmissions.
CCM transmission intervals and their application scenarios are as follows:
– 3.3 ms: 300 frames are sent per second. This interval is recommended in protection
switching.
– 10 ms: 100 frames are sent per second.
– 100 ms: 10 frames are sent per second. This interval is recommended in performance
monitoring.
– 1000 ms: 1 frame is sent per second. This interval is recommended in fault management.
– 10000 ms: 6 frames are sent per minute.
– 60000 ms: 1 frame is sent per minute.
– 600000 ms: 6 frames are sent per hour.
Select a proper CCM transmission interval to suit the CC application requirement.
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10 MPLS-TP OAM Configuration
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