Huawei Quidway S6700 series Configuration Manual page 161

Quidway S6700 Series Ethernet Switches
Configuration Guide - Reliability
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Each interface enabled with EFM OAM works in a certain mode. EFM OAM has two operation
modes: active mode and passive mode. OAM discovery and remote loopback are initiated only
by the interface in active mode.
Fault Association
You can configure the following types of association between an EFM OAM module and an
interface.
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Issue 01 (2011-07-15)
Fault notification
When an errored frame event or severe fault event occurs on the local device, the local node
sends fault notification messages to notify the peer device. At the same time, the local
device records the fault event in the log and reports the fault to the NMS. Fault events
include the following:
– System reboot
– Fault of a physical link
– Timeout of OAMPDUs
– Errors reported by the OAM module
When receiving the notification message, the peer records the event contained in the
message to the log and reports it to the NMS.
Remote loopback
When a local interface sends non-OAMPDUs to the peer, the peer does not forward the
non-OAMPDUs according to their destination MAC addresses. Instead, the peer loops back
non-OAMPDUs to the local interface. This is called remote loopback. Remote loopback
can be used to locate the link fault and test the link quality.
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.
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