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AT-S70 Management Software User’s Guide

Table 3 lists the OAM Active and OAM Passive mode behaviors.

OAMPDU Types

Two Ethernet ports use OAMPDU to exchange the OAM protocol. The

OAMPDUs use a specific multicast destination address and EtherType.

Most of the OAMPDU types are used to define a set of standard type-

length-value (TLV) encoding of attributes within the type. The OAMPDU

types are described below:

 Information OAMPDUs – Information OAMPDUs are used for

discovery; they are variable-length OAMPDUs. There are three TLVs

for Information PDUs: Local Information, Remote Information, and

Organizational Specific. Local and Remote Information is used in the

discovery process. The Organizational Specific Information TLV is

used for vendor extensions.

 Event OAMPDUs – Event OAMPDUs are used for link monitoring,

they are variable-length OAMPDUs. The data field in this event

OAMPDU contains a data field of one or more link event TLVs.

 Loopback Control OAMPDUs – Loopback Control OAMPDUs are

used to provide the loopback command.

 Variable Request/Response OAMPDUs – The Variable Request/

Response OAMPDUs accessible through OAM must be in the

Ethernet branch of the management information based (MIB) tree. For

more information, refer to “MIB Variable Retrieval and Extensions” on

page 90.

Table 3. OAM Active and Passive Mode Behaviors

Capability Active Passive

Initiates OAM Discovery process Yes No

Reacts to OAM Discovery process initiation Yes Yes

Required to send Information OAMPDUs Yes Yes

Permitted to send Event Notification OAMPDUs Yes Yes

Permitted to send Variable Request OAMPDUs Yes No

Permitted to send Variable Response OAMPDUs Yes* Yes

Permitted to send Loopback Control OAMPDUs Yes No

Reacts to Loopback Control OAMPDUs Yes* Yes

Permitted to send Organization Specific

OAMPDUs

Yes Yes

* Requires the peer station to be in Active mode.

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