TP-Link T2500-28TCTL-SL5428E T2500-28TCUN V1 User Guide - Page 128
Active OAM mode, Link Monitoring, OAM Link Events, Description, Remote Failure Indication
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Item Active OAM mode Passive OAM mode Transmitting OAMPDUs Loopback Control Available Unavailable Available Responding to Loopback Control OAMPDUs (if both sides operate Available in active OAM mode) Transmitting OAMPDUs organization-specific Available Available Table 8-1 Differences between active OAM mode and passive OAM mode After an OAM connection is established, the OAM entities on both sides exchange Information OAMPDUs periodically to keep the OAM connection valid. The OAM entity considers the OAM connection invalid if it does not receive the Information OAMPDU from the peer entity for 5 seconds. Link Monitoring Link Monitoring is for detecting and locating link faults under a variety of circumstances. When there are problems detected on the link, the device will send its remote peer the Event Notification OAMPDUs to report link events. The link events are described as follows: OAM Link Events Symbol Period Error Frame Error Frame Period Error Frame Seconds Error Description A Symbol Period Error event occurs if the number of symbol errors exceeds the threshold during a specific period of time. A Frame Error event occurs if the number of frame errors exceeds the threshold during a specific period of time. A Frame Period Error event occurs if the number of frame errors in specific number of received frames exceeds the threshold. A Frame Seconds Error event occurs if the number of error frame seconds exceeds the threshold during a specific period of time. A second is called an error frame second if error frames occur in the second. Table 8-2 OAM Link Events Remote Failure Indication Faults in Ethernet are difficult to detect, especially when the physical connection in the network is not interrupted but network performance degrades gradually. A flag in the OAMPDU allows an OAM entity to convey failure conditions to its peer. The failure conditions are as follows: Link Fault: Peer link signal is lost. This is sent once per second in the Information OAMPDU. Dying Gasp: An unrecoverable fault, such as power failure, occurs. This is sent immediately and continuously. Critical Event: Unspecified critical event occurs. This is sent immediately and continuously. 118