H3C S9500E Series Configuration Manual page 22

For Ethernet OAM connection establishment, switches can operate in active Ethernet OAM mode
or passive Ethernet OAM mode, but a switch's role will be somewhat different depending on
mode. For example, only a switch in active mode can initiate OAM Discovery. Table 6
compares active and passive Ethernet OAM modes.
OAM connections can be initiated only by OAM entities operating in active OAM mode, while those
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operating in passive mode wait and respond to the connection requests sent by their peers.
No OAM connection can be established between OAM entities operating in passive OAM mode.
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Table 6 Active and passive Ethernet OAM modes
Item
Initiating OAM Discovery
Responding to OAM Discovery
Transmitting Information OAMPDUs
Transmitting Event Notification
OAMPDUs
Transmitting Information OAMPDUs
with the Data/Pad field being
empty
Transmitting Loopback Control
OAMPDUs
Responding to Loopback Control
OAMPDUs
After an Ethernet OAM connection is established, the Ethernet OAM entities on both sides
exchange Information OAMPDUs periodically to keep the Ethernet OAM connection valid. If an
Ethernet OAM entity receives no Information OAMPDU for five seconds, the Ethernet OAM
connection is disconnected.
Active Ethernet OAM mode
Available
Available
Available
Available
Available
Available
Available (if both sides operate in
active OAM mode)
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Passive Ethernet OAM mode
Unavailable
Available
Available
Available
Available
Unavailable
Available