5
Table 4 Description of the fields in an OAMPDU
Destination MAC address of the Ethernet OAMPDU
It is a slow protocol multicast address, 0180c2000002. Bridges
cannot forward slow protocol packets, so Ethernet OAMPDUs cannot
be forwarded.
Source MAC address of the Ethernet OAMPDU
It is the bridge MAC address of the sending side and is a unicast MAC
address.
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
NOTE:
Throughout this document, a port with Ethernet OAM enabled is an Ethernet OAM entity or an OAM
entity.
Table 5 Functions of different types of OAMPDUs
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
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 establishment
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 to determine whether
Ethernet OAM connections can be established. An Ethernet OAM connection can be established only
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