H3C S5120-EI Series - Configuring Ethernet OAM; Ethernet OAM Overview; Major Functions of Ethernet OAM; Ethernet Oampdus

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Configuring Ethernet OAM
Ethernet OAM 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." 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 fall into 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. Bridges cannot forward
slow protocol packets, so 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.