How Ethernet Oam Works - HP A5830 series Configuration Manual

Figure 1 Formats of different types of Ethernet OAMPDUs
Table 4 The fields in an OAMPDU
Field
Dest addr
Source addr
Type
Subtype
Flags
Code
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.
Description
Destination MAC address of the Ethernet OAMPDU.
It is a slow protocol multicast address, 0180c2000002.
Bridges cannot forward slow protocol packets, which means you cannot forward
Ethernet OAMPDUs.
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.
Function
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.
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.
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