3Com 4510G Configuration Manual page 822

Figure 5-1 Formats of different types of Ethernet OAMPDUs
The fields in an OAMPDU are described as follows:
Table 5-1 Description of the fields in an OAMPDU
Field
Dest addr
Source addr
Type
Subtype
Flags
Code
Throughout this document, a port with Ethernet OAM enabled is called an Ethernet OAM entity or an
OAM entity.
Table 5-2 shows the function of the three types of OAMPDUs.
Destination MAC address of the Ethernet OAMPDU.
It is a slow protocol multicast address 0180c2000002. As slow
protocol packet cannot be forwarded by bridges, 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
5-2
Description