Khosravi, H., Kullgren, G., Shew, S., Sadler, J., and A. Watanabe, "Requirements for Adding Optical Support to the General Switch Management Protocol version 3 (GSMPv3)", RFC 3604, DOI 10.17487/RFC3604, October 2003, <https://www.rfc-editor.org/info/rfc3604>.