Operation Manual – OAM
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 OAM Configuration
1-2
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The Source addr field holds the source MAC address of an OAMPDU, which is the
bridge MAC address of the sending side.
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The Type field indicates the protocol type of an OAMPDU, which is fixed to
0x8809.
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The Subtype field holds the protocol sub-type of an OAMPDU, which is fixed to
0x03.
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The Flags field contains the information about an OAM entity.
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The Code field indicates the type of an OAMPDU. The value of this field can be
0x00, 0x01, and 0x04, which identifies Information OAMPDU, Event notification
OAMPDU, and Loopback control OAMPDU.
As mentioned above, Information OAMPDU, Event Notification OAMPDU, and
Loopback control OAMPDU are commonly used, which are described as follows.
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Information OAMPDUs are used for passing the state information about an
Ethernet OAM entity (including the information about the local device and remote
devices, and customized information) to another Ethernet OAM entity and
maintain OAM connections.
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Event notification OAMPDUs are used for link monitoring. They are sent as an
alarm in case a failure occurs to the link connecting the local OAM entity and a
remote OAM entity.
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Loopback control OAMPDUs are used for remote loopback control. By inserting
the information used to enable/disable loopback to a Loopback control OAMPDU,
you can enable/disable loopback on a remote OAM entity.
1.1.2 OAM Connection Establishment
Following are the four OAM functions.
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OAM connection establishment
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Link monitoring
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Remote fault detection
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Remote loopback testing
Note that OAM connection is the base of all the other Ethernet OAM functions.
I. OAM connection establishment
OAM connection establishment is also known as the Discovery phase, where an OAM
entity discovers other OAM entities and sessions between OAM entities are
established.
In this phase, interconnected OAM entities notify the peer of their OAM configuration
information and the OAM capabilities of the local nodes to support OAM by exchanging
Information OAMPDUs and determine whether OAM connections can be established.
An OAM connection can be established only when the settings concerning Loopback,
link detecting, and link event of the both side match. After an OAM connection is
established, OAM takes effect on it.
