References: RFC 8395
| Value | Defined by | Name | Description | References |
|---|---|---|---|---|
| C | IANA | Presence of a Control Word | - | RFC 4761 |
| R | IANA | Ability to receive a flow label | - | RFC 8395 |
| S | IANA | Sequenced delivery of frames | - | RFC 4761 |
| T | IANA | Request to send a flow label | - | RFC 8395 |