Huawei Quidway S3700 Series Configuration Manual page 209

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability
Figure 4-5
respectively. Ethernet CFM is configured between SwitchA and SwitchB, and the Ethernet CFM
module is associated with Eth 0/0/1 of SwitchA. When the CFM OAM module on SwitchA
detects a connectivity fault between SwitchA and SwitchB, the OAM management module
blocks and then unblocks Eth 0/0/1 so that the other interfaces on SwitchA can detect the fault.
Figure 4-7 Application scenario of association between an Ethernet CFM module and an
interface (3)
Ethernet0/0/1
A link aggregation group (LAG) in static LACP mode is configured on SwitchA and SwitchB.
Ethernet CFM is enabled on SwitchA and SwitchB; SwitchA and SwitchB belong to the same
MD; MEPs are configured on all the member interfaces of the LAG; MEPs on the interfaces of
the same link belong to the same MA; MEPs on interfaces on different links belong to different
MAs. MEPs at both ends of a link send CCMs to check connectivity of the link. The association
between an Ethernet CFM module and an interface is configured.
When a connectivity fault occurs on Link1, the OAM modules on SwitchA and SwitchB block
and unblock their Eth 0/0/1 interfaces respectively. In this manner, the LACP module detects
the connectivity fault on Link1 and switches the service data from Link1 to the inactive Link3.
This implements protection switching within 50 ms to achieve carrier-class reliability.
Issue 01 (2011-10-26)
and Figure 4-6
Eth-Trunk1
SwitchA
Ethernet0/0/2
Ethernet0/0/1
Aggregation group in 1:1
active/standby mode
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show the application of CFM on a direct link and a multi-hop link
SwitchC
Ethernet0/0/1
SwitchD
4 Ethernet OAM Configuration
Ethernet0/0/2
Eth-Trunk1
Ethernet0/0/2
Active link
MEPs in MA1
Inactive link
MEPs in MA2
MEPs in MA3
MEPs in MA4
Ethernet0/0/1
SwitchB
Ethernet0/0/2
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