| Lower layer | Selector | Value |
|---|
ethernet2 | First 8 bits of the payload when ethertype = 34825 (0x8809) | 3 (0x03) |
| Field | Type | Default | Auto | Description |
|---|
subtype | uint(8) | 3 | | Slow Protocols subtype (3 = OAM). |
flags | flags(16) | 0x50 | | Flags: link fault, dying gasp, critical event, local / remote evaluating and stable. |
code | enum(8) | 0 (information) | | OAMPDU code: 0x00 Information, 0x01 Event Notification, 0x02 Variable Request, 0x03 Variable Response, 0x04 Loopback Control, 0xfe Organization Specific. |
data | bytes — rest of the PDU | "" | | Rest of the OAMPDU, as octets. |
| Bit | Mask | Name |
|---|
| 0 | 1 (0x0001) | link_fault |
| 1 | 2 (0x0002) | dying_gasp |
| 2 | 4 (0x0004) | critical_event |
| 3 | 8 (0x0008) | local_evaluating |
| 4 | 16 (0x0010) | local_stable |
| 5 | 32 (0x0020) | remote_evaluating |
| 6 | 64 (0x0040) | remote_stable |
| Value | Name |
|---|
| 0 (0x00) | information |
| 1 (0x01) | event_notification |
| 2 (0x02) | variable_request |
| 3 (0x03) | variable_response |
| 4 (0x04) | loopback_control |
| 254 (0xfe) | organization_specific |
The next layer is selected by code; when the field is Auto the builder writes the value of the protocol stacked above.