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Diameter Congestion And Filter Attributes

This draft discusses updates to the treatment of congestion management within the DIME framework. Key topics include the integration of Filter-Rule attributes for managing network congestion, ensuring effective Quality of Service (QoS) measures. The draft highlights the limitations of ECN support and suggests improvements for classifying and treating congested traffic. Discussions cover the effectiveness of existing filters, the need for example use cases, and proposals for progressing the draft to Working Group Last Call (WGLC).

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Diameter Congestion And Filter Attributes

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  1. Diameter Congestion And Filter Attributes IETF90, Toronto, CA Lyle Bertz (lyle.t.bertz@sprint.com) Brent Hirschman (brent.hirschman@sprint.com) draft-ietf-dime-congestion-flow-attributes-00

  2. RFC 5777 Foundation Filter-Rule ::= < AVP Header: 509 > [ Filter-Rule-Precedence ] ; Condition part of a Rule ; ------------------------ [ Classifier ] * [ Time-Of-Day-Condition ] ; Action and Meta-Data ; -------------------- [ Treatment-Action ] ; Info about QoS related Actions ; ------------------------------ [ QoS-Semantics ] [ QoS-Profile-Template ] [ QoS-Parameters ] [ Excess-Treatment ] ; Extension Point ; --------------- * [ AVP ] • RFC 5777 • Filter–Rule AVP • The basis our work. • Condition/Action design

  3. Congestion Management • Filter-Rule does not support ECN in 2 ways • No AVP to add to condition part to Classify ECN marked traffic • No Congestion-Treatment Action Set (RFC has Excess-Treatment and Treatment-Action AVPs) • We need to build many filters for Congestion Management • How do we know they are working? (Is any traffic captured) • What can we observe on existing filters in order to remove unused ones OR ones deprecated by new filters?

  4. Progress since IETF89 • Draft accepted as Working Group Draft • Two issues identified for discussion • Do ECE and CWR also need support? • Are example use cases needed? • Discussion requested – One response • 4/29/14 • 5/19/14 • 6/5/14 • 6/18/14

  5. Author’s Proposals • ECE and CWR already covered in TCP Header AVP • ECN use cases are very similar to QoS use cases already provided in RFC5777. No additional work is required. • Propose progressing the draft to WGLC immediately following this meeting.

  6. Background

  7. ECN Specific AVPs • ECN-IP-CodepointAVP (Enumerated) • Specifies the Explicit Congestion Notification codepoint values to match in the IP header. • Use: Place in Filter-Rule’s Classifier • Congestion-Treatment AVP (Grouped) • Similar in design/use to Excess-TreamentAVP • NOTE: Criteria for Congestion or traffic under congestion is out of scope of the AVP specification • Flow-Count AVP (Unsigned64) • Indicates the number of protocol specific flows. The protocol is determined by the filter • Packet-Count AVP (Unsigned64) • Indicates the number of protocol specific packets.

  8. Filter AVPs for maintenance • Two AVPs • Flow-Count AVP (Unsigned64) • Indicates the number of protocol specific flows. The protocol is determined by the filter • Packet-Count AVP (Unsigned64) • Indicates the number of protocol specific packets. • Uses • Use in accounting/reporting to determine if Filter is working as planned • Can be combined with other AVPs to provide rudimentary traffic profile (e.g. bytes per flow, bytes per packet, etc.) • Can be sent in Filter-Rule as prescriptive

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