3Com 4210G Series, Configuration Manual, Page: 780 / 1133

5-2
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 Description
Dest addr
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 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
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.