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Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 148 of 669
Link OAM (LOAM) Configuration
The Ethernet Operations, Administration and Maintenance (OAM) protocol is used for monitoring and
troubleshooting Ethernet networks.
The S4224 supports the OAM functionality in both point-to-point link monitoring as ascribed in IEEE
802.3ah and also Flow OAM requirements from IEEE 802.1ag as well as the IEEE standards, ITU-T
G.1731 and ITU-T G.8021.
The S4224 supports Point-to-point link level OAM per 802.3ah to monitor the link operations in both
Active and Passive mode. Mechanisms to support the following are implemented:
1. OAM capability Discovery.
2. Link monitoring: link events notifications with diagnostic information.
3. Software based Remote failure indication: to indicate a peer that receive path of the local DTE is
non-operational.
4. Remote loop back control: a data link layer frame-level loop back mode.
You can enable or disable the OAM functionality depending on the topology requirements. These port-
based configurations are supported:
1. Mode selection (active/passive)
2. OAM Client configuration for Capability Discovery Protocol and related timers.
3. Enable/Disable Link Monitoring capability once the Link Monitor capability is enabled, OAM entity
sends out PDU with Link monitoring capability Flag set.
4. Enable/Disable Link monitoring operation; Link monitoring notifications are send out to the peer
OAM entity only when the state of discovery protocol is “send-any” as defined by the IEEE
802.3ah.
5. Enable or disable the Remote loop back control capability; once the Remote loop back control
capability is enabled, the OAM entity sends out PDU with Remote loop back capability Flag.
6. Enable or disable Remote loop back operation.
A Passive OAM entity obeys the remote loop back request from the peer OAM entity only when the state
of the discovery protocol is “send-any” as defined by the IEEE 802.3ah. Note that IIEEE 802.3ah does not
specify the configuration support for most of these features.
S4224 Link OAM configuration involves ‘Port Settings’ and ‘Event Settings’ as explained below.