3com S7906E 설치 설명서

 

1-3 

Table 1-2 Functions of different types of OAMPDUs 

Information OAMPDU 

Used for transmitting state information of an 
Ethernet OAM entity (including the information 
about the local device and remote devices, and 
customized information) to the remote Ethernet 
OAM entity and maintaining OAM connections 

Event Notification OAMPDU 

Used by link monitoring to notify the remote OAM 
entity when it detects problems on the link in 
between.  

Loopback Control OAMPDU 

Used for remote loopback control. By inserting 
the information used to enable/disable loopback 
to a loopback control OAMPDU, you can 
enable/disable loopback on a remote OAM 
entity.  

 

How Ethernet OAM Works 

This section describes the working procedures of Ethernet OAM.  

Ethernet OAM connection is the base of all the other Ethernet OAM functions. OAM connection 

establishment is also known as the Discovery phase, where an Ethernet OAM entity discovers remote 

OAM entities and establishes sessions with them.  

In this phase, interconnected OAM entities notify the peer of their OAM configuration information and 

the OAM capabilities of the local nodes by exchanging Information OAMPDUs and determine whether 

Ethernet OAM connections can be established. An Ethernet OAM connection can be established only 

when the settings concerning loopback, link detecting, and link event of the both sides match. After an 

Ethernet OAM connection is established, Ethernet OAM takes effect on it. 

As for Ethernet OAM connection establishment, a device can operate in active Ethernet OAM mode or 

passive Ethernet OAM mode. 

 compares active Ethernet OAM mode with passive Ethernet 

OAM mode. 

Table 1-3 Active Ethernet OAM mode and passive Ethernet OAM mode 

Initiating OAM Discovery 

Available 

Unavailable 

Responding to OAM Discovery   Available 

Available 

Transmitting Information 
OAMPDUs 

Available Available 

Transmitting Event Notification 
OAMPDUs 

Available Available 

Transmitting Information 
OAMPDUs with the Data/Pad 
field being empty 

Available Available 

Transmitting Loopback Control 
OAMPDUs 

Available Unavailable