4.1 Introduction to Ethernet OAM
Ethernet OAM can effectively improve management and maintenance capabilities on Ethernet
networks, which ensures the stable network operation. Ethernet OAM is applicable mainly to
Ethernet networks.
Background
The Ethernet has developed as the major Local Area Network (LAN) technology because it
features easy implementation and low cost. Recently, along with the applications of Gigabit
Ethernet and the later 10-Gigabit Ethernet, Ethernet has been extended to the Wide Area Network
(WAN).
Compared with WANs, reliability and stability are not highly required for LANs. Therefore, a
mechanism for network Operations, Administration and Maintenance (OAM) is always required
for the Ethernet. The lack of the OAM mechanism prevents Ethernet from effectively functioning
as the Internet Service Provider (ISP) network. In this manner, Ethernet OAM is becoming a
trend.
4.2 Ethernet OAM Supported by the S6700
This section describes the Ethernet OAM features supported by the S6700.
EFM OAM
802.3ah, also referred to as Ethernet in the First Mile (EFM), defines the specifications of the
Ethernet physical layer and OAM used for user access. EFM OAM detects the link in the last
mile. EFM OAM is a link-level OAM mechanism. The S6700 provides the following EFM OAM
functions:
l Peer discovery
When the EFM OAM function is enabled on an interface of the S6700 and the peer interface,
the two interfaces match their EFM OAM configurations by sending and responding to
OAM Protocol Data Units (OAMPDUs). If the EFM OAM configurations on both
interfaces match, the two interfaces start the EFM OAM handshake. During the handshake,
the two interfaces send OAMPDUs periodically to maintain the neighbor relationship.
l Link monitoring
When an interface detects an errored frame event or an errored frame error seconds event,
the interface sends an OAMPDU to notify the peer device of the event.
– An errored frame event occurs when the number of errored frames detected on an
interface reaches or exceeds the specified threshold within a certain period.
– An errored code event occurs when the number of errored codes reaches or exceeds the
specified threshold within a certain period.
– An errored frame seconds occurs when that the number of errored frame seconds
detected on an interface reaches or exceeds the specified threshold within a certain
period.
The detection duration is measured in seconds. If at least one errored frame is detected
within a second, this second is called an errored frame second.
Quidway S6700 Series Ethernet Switches
Configuration Guide - Reliability 4 Ethernet OAM Configuration-EFM
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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