Operation Manual

127
Item
Active OAM mode
Passive OAM mode
Transmitting Information OAMPDUs
Available
Available
Transmitting Event Notification
OAMPDUs
Available Available
Transmitting Information OAMPDUs
with the Data/Pad field being empty
Available Available
Transmitting Loopback Control
OAMPDUs
Available Unavailable
Responding to Loopback Control
OAMPDUs
Available
(if both sides
operate in active
OAM mode)
Available
Transmitting organization-specific
OAMPDUs
Available Available
Table 8-1 Differences between active OAM mode and passive OAM mode
After an OAM connection is established, the OAM entities on both sides exchange
Information
OAMPDUs periodically to keep the OAM connection valid. The OAM entity considers the OAM
connection invalid if it does not receive the Information OAMPDU from the peer entity for 5
seconds.
Link Monitoring
Link Monitoring is for detecting and locating link faults under a variety of circumstances. When
there are problems detected on the link, the device will send its remote peer the Event
Notification OAMPDUs to report link events. The link events are described as follows:
OAM Link Events
Description
Symbol Period Error
A Symbol Period Error event occurs if the number of
symbol errors exceeds the threshold during a
specific period of time.
Frame Error
A Frame Error event occurs if the number of frame
errors exceeds the threshold during a specific period
of time.
Frame Period Error
A Frame Period Error event occurs if the number of
frame errors in specific number of received frames
exceeds the threshold.
Frame Seconds Error
A Frame Seconds Error event occurs if the number
of error frame seconds exceeds the threshold during
a specific period of time. A second is called an error
frame second if error frames occur in the second.
Table 8-2 OAM Link Events