Draft:Common Management Interface Specification
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| Common Management Interface Specification | |
|---|---|
| Abbreviation | CMIS |
| Status | Published |
| Year started | 2018 |
| First published | 2018 |
| Latest version | 5.3 September 4, 2024 |
| Organization | Optical Internetworking Forum |
| Domain | Management of pluggable network modules |
| Website | www |
Common Management Interface Specification (CMIS) is a specification that defines an interface between a host, such as a switch in a data center, and a pluggable (or soldered on-board) module in a copper cable or fiber communication link for data centers or metro areas.[1] The specification is published by Optical Internetworking Forum (OIF)[2] and it standardizes communications protocols for configuration – selecting capabilities advertised by modules such as signaling rate, error correction modes and Tx/Rx equalization; diagnostics such as loopbacks (4 types), PRBS test-pattern generation/checking and bit-error-rate measurement; and health checks such as signal-to-noise ratios (SNR), bit error rates (BER) and temperature.[1] CMIS references separate mechanical specifications such as QSFP-DD, OSFP MSA and COBO.[1]
History
[edit]Since its first public release in 2018, the CMIS specification has evolved as modules become more complex, outgrowing legacy two-wire management protocols.[3]
- 2018 — Revision 3.0, the first public release, published by the QSFP-DD MSA group[1][4]
- 2019 — Revision 4.0, added CDB messaging, firmware updates, VDM diagnostics, and the diagnostics pages[1]
- 2021 — Revision 5.0, added specifications regarding bank and page select behavior, security rules and the replacement of terminology Master/Slave with Initiator/Target[1][5]
- November 2021 — Revision 5.1, added new Pages 16h (Network Path) and 17h (Flags and Masks)[1]
- January 2022 — Development transferred from the QSFP-DD MSA to OIF's Physical and Link Layer Working Group, to increase broader industry participation[2][6]
- April 2022 — Revision 5.2, the first OIF-published revision[1]
- September 2024 — Revision 5.3, co-packaged optics, SPI-based management interface option, and module authentication commands[1][7]
Technical overview
[edit]The Management Interface is used to manage the module that carries high-bandwidth data traffic flowing between the host and media (also known as line side) of the module. This management interface is a slower I2C link (or SPI, added in 5.3), exposing a 256-byte window of data registers that is page-based, where the lower half is fixed and the upper half is switchable.[1] Data-path configuration involves routing of multiple lanes between the host and media. The media side involves three types: fiber, passive copper or active copper.[1] Module capabilities are advertised in the register space.[1]
Optional firmware updates using Command Data Blocks (CDB) allow for standardized field updates[1] with Linux support[8] deployed in router platforms.[9]
The standard defines a state machine that progresses from boot-up to ModuleLowPwr, ModulePwrUp and ModuleReady states, managed by the host as it inspects and configures the module before letting it draw full power.[1]
See also
[edit]References
[edit]- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 "Implementation Agreement OIF-CMIS-05.3: Common Management Interface Specification (CMIS), Revision 5.3" (PDF). Optical Internetworking Forum. September 4, 2024. Retrieved September 13, 2026.
- 1 2 "OIF takes over QSFP-DD CMIS Common Management Interface Specification development". Lightwave. January 2022. Retrieved September 13, 2026.
- ↑ Brooks, Paul (August 2020). "Testing Pluggable Coherent Optics" (PDF). VIAVI Solutions. Retrieved September 13, 2026.
- ↑ "QSFP-DD MSA Group releases updated 4.0 Hardware Specification and Common Management Interface Specification". Semiconductor Today. September 18, 2018. Retrieved September 13, 2026.
- ↑ "QSFP-DD MSA announces HW Spec 6.0, CMIS 5.0 and thermal design whitepaper". Semiconductor Today. May 25, 2021. Retrieved September 13, 2026.
- ↑ "OIF advances Common Management Interface Spec (CMIS)". Converge! Network Digest. Retrieved September 13, 2026.
- ↑ "OIF unveils three new CMIS implementation agreements". Optical Connections News. September 2024. Retrieved September 13, 2026.
- ↑ "Add ability to flash modules' firmware". LWN.net. June 2024. Retrieved September 13, 2026.
- ↑ "Cisco 8000 Optics Firmware Management". XRdocs. Cisco Systems. Retrieved September 13, 2026.
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