R3303-HP HSR6800 Routers High Availability Configuration Guide

8
Configuring Ethernet OAM
Ethernet OAM is supported only when the SAP module is operating in bridge mode.
Overview
Ethernet Operation, Administration and Maintenance (OAM) is a tool that monitors Layer 2 link status
and addresses common link-related issues on the "last mile." Ethernet OAM improves Ethernet
management and maintainability. You can use it to monitor the status of the point-to-point link between
two directly connected devices.
Major functions of Ethernet OAM
Ethernet OAM provides the following functions:
• Link performance monitoring—Monitors the performance indices of a link, including packet loss,
delay, and jitter, and collects traffic statistics of various types
• Fault detection and alarm—Checks the connectivity of a link by sending OAM protocol data units
(OAMPDUs) and reports to the network administrators when a link error occurs
• Remote loopback—Checks link quality and locates link errors by looping back OAMPDUs
Ethernet OAMPDUs
Ethernet OAM works on the data link layer. Ethernet OAM reports the link status by periodically
exchanging OAMPDUs between devices, so that the administrator can effectively manage the network.
Ethernet OAMPDUs include the following types: Information, Event Notification, and Loopback Control.
Figure 1 Formats of different types of Ethernet OAMPDUs
Table 4 Fields in an OAMPDU
Field Descri
p
tion
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.