SNR S2989G-48TX-DC — настройка и управление Ethernet OAM: Руководство по эксплуатации [96/553]
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SNR S2989G-48TX-DC — настройка и управление Ethernet OAM: Руководство по эксплуатации [96/553]

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S2989G-24TX Operation Manual Chapter 2 Layer 2 services
Configuration
LAN
CSMA/CD
Layers
Higher layers
LLC
OAM(Optional)
MAC
Physical Layer
Figure 2-11 OAM location in OSI model
OAM protocol data units (OAMPDU) use destination MAC address 01-80-c2-00-00-
02 of protocol, the max transmission rate is 10Pkt/s.
EFM OAM is established on the basis of OAM connection, it provides a link operation
management mechanism such as link monitoring, remote fault detection and remote
loopback testing, the simple introduction for EFM OAM in the following:
1. Ethernet OAM connection establishment
Ethernet OAM entity discovers remote OAM entities and establishes sessions with
them by exchanging Information OAMPDUs. EFM OAM can operate in two modes: active
mode and passive mode. One session can only be established by the OAM entity working
in the active mode and ones working in the passive mode need to wait until it receives the
connection request. After an Ethernet OAM connection is established, the Ethernet OAM
entities on both sides exchange Information OAMPDUs continuously to keep the valid
Ethernet OAM connection. If an Ethernet OAM entity receives no Information OAMPDU
for five seconds, the Ethernet OAM connection is disconnected.
2. Link Monitoring
Fault detection in an Ethernet is difficult, especially when the physical connection in
the network is not disconnected but network performance is degrading gradually. Link
monitoring is used to detect and discover link faults in various environments. EFM OAM
implements link monitoring through the exchange of Event Notification OAMPDUs. When
detecting a link error event, the local OAM entity sends an Event Notification OAMPDU to
notify the remote OAM entity. At the same time it will log information and send SNMP Trap
to the network management system. While OAM entity on the other side receives the
notification, it will also log and report it. With the log information, network administrators
can keep track of network status in time.
The link event monitored by EFM OAM means that the link happens the error event,
OSI Model
Application
Presentation
Session
Transport
Network
Data Link
Physical

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