How Ethernet Oam Works - HPE FlexNetwork HSR6800 series Configuration Manual

Field
Type
Subtype
Flags
Code
NOTE:
Throughout this document, an Ethernet OAM-enabled port is called an "Ethernet OAM entity" or an
"OAM entity."
Table 5 Functions of different types of OAMPDUs
OAMPDU type
Information OAMPDU
Event Notification
OAMPDU
Loopback Control
OAMPDU

How Ethernet OAM works

This section describes the working procedures of Ethernet OAM.
Ethernet OAM connection establishment
Ethernet OAM connection is the basis of all the other Ethernet OAM functions. OAM connection
establishment is also known as the "Discovery phase," where an Ethernet OAM entity discovers the
remote OAM entity to establish a session.
In this phase, two connected OAM entities exchange Information OAMPDUs to advertise their OAM
configuration and capabilities to each other for a comparison. If their Loopback, link detection, and
link event settings match, the OAM entities establish an OAM connection.
An OAM entity operates in active mode or passive mode. OAM entities in active mode initiate OAM
connections, and OAM entities in passive mode wait and respond to the OAM connection requests.
IMPORTANT:
To set up an OAM connection between two OAM entities, you must set at least one entity to operate
in active mode.
Table 6 shows the actions that a device can perform in different modes.
Table 6 Active Ethernet OAM mode and passive Ethernet OAM mode
Item
Initiating OAM Discovery
Description
Type of the encapsulated protocol in the Ethernet OAMPDU.
The value is 0x8809.
The specific protocol being encapsulated in the Ethernet OAMPDU.
The value is 0x03.
Status information of an Ethernet OAM entity.
Type of the Ethernet OAMPDU.
Function
Transmits 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 maintains OAM connections.
Used by link monitoring to notify the remote OAM entity when it detects problems
on the link in between.
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.
Active Ethernet OAM mode
Available
8
Passive Ethernet OAM
mode
Unavailable