H3C Technologies H3C S12500 Series Switches - Manual (Page 20)

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Figure 1 Formats of different types of Ethernet OAMPDUs
Table 4 Fields in an OAMPDU
Field Description
Dest addr
Destination MAC address of the Ethernet OAMPDU.
It is a slow protocol multicast address 0180c2000002. Because bridges cannot
forward slow protocol packets, Ethernet OAMPDUs cannot be forwarded.
Source addr
Source MAC address of the Ethernet OAMPDU.
It is the bridge MAC address of the sending side and is a unicast MAC address.
Type
Type of the encapsulated protocol in the Ethernet OAMPDU.
The value is 0x8809.
Subtype
The specific protocol being encapsulated in the Ethernet OAMPDU.
The value is 0x03.
Flags Status information of an Ethernet OAM entity.
Code Type of the Ethernet OAMPDU.
NOTE:
Throughout this document, a port with Ethernet OAM enabled is called an Ethernet OAM entity or an
OAM entity.
Table 5 Functions of different types of OAMPDUs
OAMPDU type Function
Information OAMPDU
Used for transmitting state information of an Ethernet OAM entity (including
information about the local 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.