R3303-HP HSR6800 Routers High Availability Configuration Guide

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Table 6 Active Ethernet OAM mode and passive Ethernet OAM mode
Item Active Ethernet OAM mode
Passive Ethernet OAM mode
Initiating OAM Discovery Available Unavailable
Responding to OAM Discovery Available Available
Transmitting Information
OAMPDUs
Available Available
Transmitting Event Notification
OAMPDUs
Available Available
Transmitting Information
OAMPDUs without any TLV
Available Available
Transmitting Loopback Control
OAMPDUs
Available Unavailable
Responding to Loopback Control
OAMPDUs
Available when both sides are
operating in active OAM mode
Available
After an Ethernet OAM connection is established, the Ethernet OAM entities exchange Information
OAMPDUs at the handshake packet transmission interval to detect the availability of the Ethernet OAM
connection. If an Ethernet OAM entity receives no Information OAMPDU within the Ethernet OAM
connection timeout time, the Ethernet OAM connection is considered disconnected.
Link monitoring
Error detection in an Ethernet is difficult, especially when the physical connection in the network is not
disconnected but network performance is degrading gradually.
Link monitoring detects link faults in various environments. Ethernet OAM entities monitor link status by
exchanging Event Notification OAMPDUs. When detecting one of the link error events listed in Table 7,
an O
AM entity sends an Event Notification OAMPDU to its peer OAM entity. The network administrator
can keep track of network status changes by retrieving the log.
Table 7 Ethernet OAM link error events
Ethernet OAM link events Descri
p
tion
Errored symbol event
Occurs when the number of detected symbol errors during a specific
detection interval exceeds the predefined threshold.
Errored frame event
Occurs when the number of detected error frames during a specific interval
exceeds the predefined threshold.
Errored frame period event
Occurs if the number of frame errors in a specific number of received frames
exceeds the predefined threshold.
Errored frame seconds event
Occurs when the number of error frame seconds detected on a port during
a specific detection interval reaches the error threshold.
The system transforms the period of detecting errored frame period events into the maximum number of
64-byte frames that a port can send in the specified period. The system takes the maximum number of
frames sent as the period. The maximum number of frames sent is calculated using this formula:
Maximum number of frames = interface bandwidth (bps) × errored frame period event detection period
(in ms)/(64 × 8 × 1000)
The second in which errored frames appear is called an "errored frame second."