RFC 4594: Configuration Guidelines for DiffServ Service Classes

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc4594.html

Published

2006-08-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

IETF Trust; BCP 78 / RFC Editor terms; short excerpts and locators only

Source notes citing this source

• RFC 4594 assigns CS3 to the Broadcast Video service class, not to signaling. in context
• RFC 4594 says CS6-marked flows from untrusted sources such as end-user devices should be dropped or re-marked at ingress to the DiffServ network. in context
• RFC 4594 reserves CS7 (decimal 56) for future use and recommends dropping or re-marking CS7 packets at ingress to a DiffServ domain. in context
• RFC 4594, the DiffServ service-class configuration guideline, is an Informational RFC published in August 2006, not a Standards Track specification. in context
• RFC 4594 maps the Multimedia Conferencing service class to AF41, AF42 and AF43. in context
• RFC 4594 maps the Signaling service class to CS5 (101000, decimal 40). in context
• RFC 4594 maps the Telephony service class to EF (101110, decimal 46). in context
• RFC 4594 says the Telephony service class should use the EF PHB and be configured with a priority queuing system. in context
• RFC 4594 says telephony packet flows from untrusted sources such as end-user devices should be policed at ingress to the DiffServ network. in context
• Signaling DSCP is not consistent across the sources. RFC 4594 and Teams use CS5, the Cisco Collaboration PA and Webex devices use CS3, and the Webex App uses CS0. A single signaling class-map will therefore not match all vendors. inferred in context
• RFC 4594 recommends that the Signaling service class use the CS5 class selector with rate queuing. in context
• RFC 4594 recommends that the Telephony service class use the Expedited Forwarding (EF) PHB with priority queuing and no active queue management. in context
• RFC 4594 says the Signaling service class SHOULD use the Class Selector PHB with DSCP CS5. in context
• RFC 4594 says the Telephony service class SHOULD use the Expedited Forwarding PHB, DSCP EF (decimal 46). in context

Cite this source record

APA

WarmTransfer. (2006, August 1). RFC 4594: Configuration Guidelines for DiffServ Service Classes. WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-4594-diffserv-service-classes

BibTeX

@misc{warmtransfer-rfc-4594-diffserv-service-classes,
  title  = {RFC 4594: Configuration Guidelines for DiffServ Service Classes},
  author = {{WarmTransfer}},
  year   = {2006},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-4594-diffserv-service-classes},
  note   = {IETF / RFC Editor, accessed 2026-09-24}
}