H3C Technologies H3C SR8800 - Manual (Page 21)

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NOTE:
The support of H3C routers for information OAMPDUs carrying critical link events is as follows:
• H3C routers are able to receive information OAMPDUs carrying the critical link events listed in Table 8 .
• H3C routers are able to send information OAMPDUs carrying Dying Gasp events when the router is
rebooted or relevant ports are manually shut down.
• H3C routers 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 802.3h (Carrier Sense Multiple Access with Collision Detection
(CSMA/CD) Access Method and Physical Layer Specifications.
Ethernet OAM configuration task list
Complete the following tasks to configure Ethernet OAM:
Task Remarks
Configuring basic Ethernet OAM functions Required
Configuring link
monitoring
Configuring errored frame event detection Optional
Configuring errored frame period event detection Optional
Configuring errored frame seconds event detection Optional
Configuring
Ethernet 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
As for Ethernet OAM connection establishment, an Ethernet OAM entity operates in active mode or
passive mode. Only an Ethernet OAM entity in active mode can initiate connection establishment. After
Ethernet OAM is enabled on an Ethernet port, according to its Ethernet OAM mode, the Ethernet port
establishes an Ethernet OAM connection with its peer port.
NOTE:
To change the Ethernet OAM mode on an Ethernet OAM-enabled port, you need to first disable Ethernet
OAM on the port.