R3102-R3103-HP 6600/HSR6600 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
Dest addr
6
Source addr Type Subtype Flags Code Data/Pad CRC
0x00 Local info TLV Remote info TLV ...
12126 42 to 1496 4
Information OAMPDU
Event notification OAMPDU
Loopback control OAMPDU
0x01
0x04
seq Link event TLV
Loopback command
...