Huawei Quidway S3700 Series Configuration Manual page 166

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability
Fault Association
You can configure the following types of association between an EFM OAM module and an
interface.
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Issue 01 (2011-10-26)
to locate faults. 802.1ag MAC trace is initiated by a MEP and destined for an RMEP or
MIP in the same MA.
– Gmac trace
Gmac trace works similarly to 802.1ag MAC trace. A MEP, however, is not required
to initiate Gmac trace. The destination node may not be an RMEP or a MIP. That is,
Gmac trace can be implemented without configuring the MD, MA, or MEP on the source
device, the intermediate device, and the destination device. All the intermediate devices
can respond with a Linktrace Reply (LTR).
After EFM OAM detects a fault, the OAM management module blocks the interface
intermittently. That is, the module shuts down the interface for seven seconds, and then it
unblocks the interface.
When EFM OAM detects a fault, the interface bound to the EFM OAM module is shut
down or a Port-Down event is sent. When the interface is Down, a fault notification message
is sent to the EFM OAM module of the peer device through association.
Association between an EFM OAM module and an interface
After association between an EFM OAM module and an interface is configured, when the
EFM OAM module detects a link fault, no packets except OAMPDUs can be forwarded
through the bound interface, and Layer 2 and Layer 3 services are blocked. Therefore, the
association between an EFM OAM module and an interface may greatly affect services.
When the current interface detects link fault recovery through EFM OAM, all packets can
be forwarded on the interface and Layer 2 and Layer 3 services are unblocked.
In addition, you can configure the association between EFM OAM and an interface only
after EFM OAM at both ends are in detect state.
Association between EFM OAM modules
After a fault is detected, the OAM management module transmits a fault notification
message through association.
– An EFM OAM module on an interface transmits a fault message to an EFM OAM
module on the other interface.
– EFM OAM modules on the two interfaces report faults to each other.
Association between an Ethernet CFM module and an interface
You can configure the following types of association between an Ethernet CFM module
and an interface.
– When a connectivity fault is detected on the link between the MEP and the RMEP in
an MA, the OAM management module blocks the interface intermittently. That is, the
module shuts down the interface for seven seconds, and then unblocks the interface.
– After Ethernet CFM detects a fault, the interface associated with the Ethernet CFM
module is shut down or a Down event is sent. When the interface becomes Down, the
Ethernet CFM status bound to the interface also becomes Down.
Association between an Ethernet CFM module and an EFM OAM module
When the Ethernet CFM module detects a fault in an MA, the OAM management module
reports the fault to the peer device enabled with EFM OAM through the interface. When
the EFM OAM module detects a fault, the OAM management module reports the fault to
the MA through the interface. The fault report mode can be the following:
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4 Ethernet OAM Configuration
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