H3C Technologies H3C S7500E Series Switches - Manual (Page 25)

3-6
The support of S7500E series Ethernet switches for information OAMPDUs carrying critical link events
is as follows:
z S7500E series Ethernet switches are able to receive information OAMPDUs carrying the critical
link events listed in Table 3-5 .
z Only the Gigabit optical ports are able send information OAMPDUs carrying Link Fault events.
z S7500E series Ethernet switches are able to send information OAMPDUs carrying Dying Gasp
events when the device is rebooted or relevant ports are manually shut down. Physical IRF ports,
however, are unable to send this type of OAMPDUs. For more information about physical IRF
ports, see IRF Configuration in the IRF Configuration Guide.
z S7500E series Ethernet switches are unable to send information OAMPDUs carrying Critical
Events.
Remote loopback
Remote loopback is available only after the Ethernet OAM connection is established. With remote
loopback enabled, the Ethernet OAM entity operating in active Ethernet OAM mode sends
non-OAMPDUs to its peer. After receiving these PDUs, the peer does not forward them according to
their 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 remote
loopback periodically helps to detect network faults in time. Furthermore, performing remote loopback
by network segments helps to locate network faults.
Standards and Protocols
Ethernet OAM is defined in IEEE 802.3h (Carrier Sense Multiple Access with Collision Detection
(CSMA/CD) Access Method and Physical Layer Specifications. Amendment: Media Access Control
Parameters, Physical Layers, and Management Parameters for Subscriber Access Networks).
Ethernet OAM Configuration Task List
Complete the following tasks to configure Ethernet OAM:
Task Remarks
Configuring Basic Ethernet OAM Functions Required
Configuring Errored Frame Event Detection Optional
Configuring Errored Frame Period Event Detection Optional
Configuring
Link
Monitoring
Configuring Errored Frame Seconds Event Detection Optional
Enabling OAM Remote Loopback Optional