H3C Technologies H3C S12500 Series Switches - Manual (Page 23)

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The support of H3C switches for information OAMPDUs carrying critical link events is as follows:
• H3C switches are able to receive information OAMPDUs carrying the critical link events listed
in
Table 8 .
• H3C devices 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
Guide.
• H3C 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 frames, 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 promptly. Furthermore, performing remote loopback
by network segments helps to locate network faults.
Standards and protocols
Ethernet 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 list
Task Remarks
Configuring basic Ethernet OAM functions Required
Configuring the Ethernet OAM connection detection timers Optional
Configuring link
monitoring
Configuring errored frame event detection Optional
Configuring errored frame period event detection Optional
Configuring errored frame seconds event detection Optional
Enabling OAM
remote loopback
Enabling Ethernet OAM remote loopback
Optional
Rejecting the Ethernet OAM remote loopback
request from a remote port
Configuring basic Ethernet OAM functions
CAUTION:
To change the Ethernet OAM mode on an Ethernet OAM-enabled port, you must first disable Ethernet
OAM on the port.
An Ethernet OAM entity is operating in active or passive mode to establish Ethernet OAM connections.
Only an Ethernet OAM entity in active mode can initiate connection establishment. After Ethernet OAM