R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

9
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, an Ethernet OAM-enabled port is called an "Ethernet OAM entity" or an
"OAM entity."
Table 5 Functions of different types of OAMPDUs
OAMPDU type
Function
Information OAMPDU
Transmits 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 maintains 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.
Ethernet OAM connection establishment
Ethernet OAM connection is the basis of all the other Ethernet OAM functions. OAM connection
establishment is also known as the "Discovery phase," where an Ethernet OAM entity discovers the
remote OAM entity to establish a session.
In this phase, two connected OAM entities exchange Information OAMPDUs to advertise their OAM
configuration and capabilities to each other for a comparison. If their Loopback, link detection, and
link event settings match, the OAM entities establish an OAM connection.
An OAM entity operates in active mode or passive mode. OAM entities in active mode initiate OAM
connections, and OAM entities in passive mode wait and respond to the OAM connection requests.