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Oct 17, 2007
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From Protocol Stack to Protocol Heap
- Role-Based Architecture
- R. Braden, T. Faber, M. Handley
Role-Based Architecture & Network Pointers Jona Schoch Seminar - - PowerPoint PPT Presentation
Role-Based Architecture & Network Pointers Jona Schoch Seminar - - PowerPoint PPT Presentation
Role-Based Architecture & Network Pointers Jona Schoch Seminar in Distributed Computing Oct 17, 2007 From Protocol Stack to Protocol Heap - Role-Based Architecture R. Braden, T. Faber, M. Handley 2 Protocol Stack model Consists of
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Protocol Stack model
Consists of
Protocol layers Protocol headers
Created in the 70s Worked well
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Problems
Internet has changed! Usual suspects: NAT,
Firewalls, Proxies…
„Last on – first off“ Inflexibility
Source: M. Kaufmann
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A new architecture
No stack No Layers New functional unit: Role
Role-based Architecture: RBA
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Role
Communicating building block Performs function on packets Generally not hierarchical May be stateful
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Properties of Roles
Instantiated in Network-nodes Identified by a RoleID Role address: RoleID@NodeID Reflective roles Generic roles …
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Role Data
Input / output of a role
Application data payload Metadata
Role Specific Headers (RSHs)
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Role Specific Headers
Divided metadata Format role specific Addressed to roles RSH ( <RoleAddressList> ; <RSHBody> )
Packet
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Datagram Delivery Example
RSH ( <RoleAddressList> ; <RSHBody> ) RBA equivalent to a simple IP datagram
{ RSH(LinkLayer@NextHopAddr ; ), RSH(HbHForward@* ; destNodeID), RSH(HbHSource@* ; sourceNodeID), RSH(DestApp@destNodeID ; AppID, payload) }
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RBA Objectives
Extensibility Portability Auditability Controlled access to metadata
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Realization of RBA
Variety of ways further research required
Entirely role-based Above particular layer Only abstraction
Packet format design
Generality vs. wasting bytes
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Packet Structure
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Network Pointers
- R. Gold, C. Tschudin
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Goals
Break the processing black box!
Control packet handling
Empower the end-nodes!
Directable indirection
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Network Pointers
Packet processing function
Addressable Forwarding Header modification
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Basic idea
Keep IP Configure Data Link layer Pointer Space
Mapping from/to IP Build new services
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Network Pointers - Terminology
Network Pointer Selector (local) = Pointer value Context Resolution function
On all network nodes Well known selector
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Implications
Forwarding State
in network in packet (parameter stack)
From End- to Start-Addresses!
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Example: Mobile Personal Area Network
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Combining RBA & Network Pointers
Get rid of implicit layer 2.5 Network Pointers as back plane for RBA
Steering packets Identifying processing instances
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Remaining questions
What is really new? How to change state of pointers?
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References
„From Protocol Stack to Protocol Heap – Role-
Based Architecture“, R. Braden, T. Faber, M. Handley
„New Internet Architectures“, M. Kaufmann
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„Network Pointers“, R. Gold, C. Tschudin „A Virtualized Link Layer with Support for
Indirection“, R. Gold, P. Gunningberg, C. Tschudin
„LUNAR: Lightweight Underlay Network Ad-hoc
Routing“, R. Gold, C. Tschudin
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