Services Provided by RSerPool <draft-ietf-rserpool-service-00.txt >

1
Services Provided by RSerPoolltdraft-ietf-rserpool
-service-00.txt gt

• Authors
• Peter Lei ltpeterlei_at_cisco.comgt
• Phillip Conrad ltconrad_at_acm.orggt
• Presenter
• Michael Tüxen lttuexen_at_fh-muenster.degt

2
Motivation

• Two concerns raised at IETF 53
• Need clearer picture of how applications interact
  with RSerPool
• Need way to support PU-PE interactions on
  protocols other than SCTP
• Drafts
• draft-ietf-rserpool-service
• draft-ietf-rserpool-tcpmapping

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Current iteration of services

• Two ways an application can interact with
  RSerPool
• Basic Mode
• ASAP interaction to do server selection
• PU-PE application layer protocol done
  separately (not mediated by RSerPool)
• Enhanced Mode
• Multiplexed control/data channel managed by
  RSerPoolover either SCTP or TCPshim layer
  (tcpmapping)
• notes
• a given application must choose one, and all PEs
  in a given pool must make the same choice
• the choice is implicit for a given application,
  and therefore no on the wire signaling is
  necessary

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Current iteration of services

• Two ways an application can interact with
  RSerPool
• Basic Mode
• Enhanced Mode
• Services common to both types of application
  interaction
• Initialization
• PE Registration Services
• PE Selection (high availability and load
  balancing)
• PE selection services (Basic Mode)
• pool handle-gt ip address/protocol/port
  translation
• (but enhanced with PE selection to make sure the
  choice is a good one
• transport.failure report
• Enhanced failover services (available only with
  multiplexed data/control channel managed by
  RSerPool)
• data send/receive primitives
• With automatic PE selection
• With optional best-effort redirection if PE fails
  or is unreachable
• business card
• state cookie
• failure indication callback

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RSerPool Framework
Basic Mode
Enhanced Mode
Upper Layer Protocol / Application
Upper Layer Protocol / Application
RSerPool API
RSerPool API
ASAP Layer
Data
ASAP Layer
Multiplexed ASAPand Data messages
Mapping Layer
Any Transport Protocol
TCP or SCTP
SCTP
TCP