H3C S5120-EI Series Configuration Manual

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H3C S5120-EI Series Configuration Manual Manual pdf 16 page image

7A second in which errored frames appear is called an "errored frame second."Remote fault detectionInformation OAMPDUs are exchanged periodically among Ethernet OAM entities across establishedOAM connections. In a network where traffic is interrupted due to device failures or unavailability, theflag field defined in information OAMPDUs allows an Ethernet OAM entity to send errorinformation—the critical link event type—to its peer. You can use the log information to track ongoing linkstatus and troubleshoot problems promptly.Table 8 Critical link eventsType Description OAMPDU transmission frequenciesLink Fault Peer link signal is lost. Once per secondDying Gasp A power failure or other unexpected erroroccurred. Non-stopCritical Event An undetermined critical event occurred. Non-stopThis Switch Series is able to receive information OAMPDUs carrying the critical link events listed in Table8.Only the Gigabit fiber ports are able to send information OAMPDUs carrying Link Fault events.This Switch Series is able to send information OAMPDUs carrying Dying Gasp events when the device isrebooted or relevant ports are manually shut down. Physical IRF ports, however, are unable to send thistype of OAMPDU. For more information about physical IRF ports, see IRF Configuration Guide.This Switch Series is unable to send information OAMPDUs carrying Critical Events.Remote loopbackRemote loopback is available only after the Ethernet OAM connection is established. With remoteloopback enabled, the Ethernet OAM entity operating in active Ethernet OAM mode sendsnon-OAMPDUs to its peer. After receiving these frames, the peer does not forward them according totheir destination addresses. Instead, it returns them to the sender along the original path.Remote loopback enables you to check the link status and locate link failures. Performing remoteloopback periodically helps to detect network faults promptly. Furthermore, performing remote loopbackby network segments helps to locate network faults.Standards and protocolsEthernet OAM is defined in IEEE 802.3ah (Carrier Sense Multiple Access with Collision Detection(CSMA/CD) Access Method and Physical Layer Specifications.Ethernet OAM configuration task listTask RemarksConfiguring basic Ethernet OAM functions RequiredConfiguring the Ethernet OAM connection detection timers OptionalConfiguring linkmonitoringConfiguring errored symbol event detection OptionalConfiguring errored frame event detection Optional