SIP Overload Control Strategies for Efficient Network Management
Open Forum 2015
11
th
November 2015
SIP Overload Control (SOC)
Task Group
Philip Williams – BT
Chair of Group
●
SIP increasing
–
connectivity
–
applications
–
traffic
●
Wider application
–
not just session control
●
Protocol efficiency
–
verbose?
●
Generic overload control principles still apply
Drivers
Overload control imperative
Nodal
Excessive nodal load
high response times
timeouts + caller abandons + retries
ineffective workload
‘goodput’ crash
Destination
Excessive destination focused load
high busy rate
ineffective workload
‘
goodput’ reduction
●
Basis – 3 IETF SOC RFCs
–
need for external restriction of load demonstrated
–
prior experience
●
Requirements
–
clarify: purpose, scope of application
–
integration with other functions / signalling protocols
–
overcome any RFC design issues or gaps
–
traffic priorities
●
Options
–
identify what should be optional and what shouldn’t
●
Guidance
–
implementation - fill in the gaps
–
highlight re-use opportunities
●
Recommendations
–
the detail
SOC TG Strategy
Well understood
–
choices highlighted
–
some issues identified
Progress – RFCs
●
Source (Client) SIP message restriction algorithms
Max Rate – ‘rate-based’
or
Proportional rejection – ‘loss-based’
●
Interaction with load-balancing & failover
Load-share → Restrict (SOC)
Restrict (SOC) → Load-share ?
●
Differentiated workload - message/session priorities
–
Target Server, Source Client: Which messages should they count?
●
Mixed protocol architecture, e.g. ISUP, BICC
ISUP AACC
SOC hop-by-hop
●
Non-conforming traffic sources
–
Can they be detected?
–
What action should be taken?
Progress - Requirements
To be continued …
Would you like to be
involved?
This content discusses the importance of overload control in SIP networks to manage excessive loads, high response times, and ineffective workloads. It explores strategies such as SIP Rate Control, Nodal Overload Control, and Destination Overload Control for improving network performance. The content also highlights the role of the SIP Overload Control Task Group in setting standards and strategies for managing network traffic effectively.
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http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpghttp://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg Open Forum 2015 http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited 10/09/2024 11th November 2015
SIP Overload Control (SOC) Task Group Philip Williams BT Chair of Group http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited 10/09/2024
Drivers SIP increasing connectivity applications traffic Wider application not just session control Protocol efficiency verbose? Generic overload control principles still apply http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited NICC Standards Limited 10/09/2024
Overload control imperative Excessive nodal load high response times timeouts + caller abandons + retries ineffective workload goodput crash Nodal DestinationExcessive destination focused load goodput reduction high busy rate ineffective workload http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited NICC Standards Limited 10/09/2024
SOC TG Strategy Basis 3 IETF SOC RFCs need for external restriction of load demonstrated prior experience Requirements clarify: purpose, scope of application integration with other functions / signalling protocols overcome any RFC design issues or gaps traffic priorities Options identify what should be optional and what shouldn t Guidance implementation - fill in the gaps highlight re-use opportunities Recommendations the detail http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited NICC Standards Limited 10/09/2024
Progress RFCs Well understood choices highlighted some issues identified Title RFC Purpose Method SIP Overload Control 7339 Nodal overload control Hop-by-hop (Via Header) SIP Rate Control 7415 " " SIP Load Control Event Package 7200 Destination overload control Subscribe-Notify http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited NICC Standards Limited 10/09/2024
Progress - Requirements Source (Client) SIP message restriction algorithms Max Rate rate-based or Proportional rejection loss-based Interaction with load-balancing & failover Load-share Restrict (SOC) Restrict (SOC) Load-share ? Differentiated workload - message/session priorities Target Server, Source Client: Which messages should they count? Mixed protocol architecture, e.g. ISUP, BICC ISUP AACC SOC hop-by-hop Non-conforming traffic sources Can they be detected? What action should be taken? http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited NICC Standards Limited 10/09/2024
To be continued Would you like to be involved? http://www.venuesallareas.com/uploads/images/venues_all_areas/venues/855_750x525.jpg NICC Standards Limited 10/09/2024
