Thoughts on Network Modeling

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Presentation transcript:

Thoughts on Network Modeling Freek Dijkstra Universiteit van Amsterdam, Netherlands XML vs RDF 9 May 2007

Model versus Syntax Functional Elements Network Elements Syntax <ndl:Device rdf:about="#Force10"> <ndl:hasInterface rdf:resource= "#Force10:te6/0"/> </ndl:Device> <ndl:Interface rdf:about="#Force10:te6/0"> <rdfs:label>te6/0</rdfs:label> <ndl:capacity>1.25E9</ndl:capacity> <ndlconf:multiplex> <ndlcap:adaptation rdf:resource= "#Tagged-Ethernet-in-Ethernet"/> <ndlconf:serverPropertyValue rdf:resource="#MTU-1500byte"/> </ndlconf:multiplex> <ndlconf:hasChannel> <ndlconf:Channel rdf:about= "#Force10:te6/0:vlan4"> <ndleth:hasVlan>4</ndleth:hasVlan> <ndlconf:switchedTo rdf:resource= "#Force10:gi5/1:vlan7"/> </ndlconf:Channel> </ndlconf:hasChannel> </ndl:Interface> Information Model / Data Model: RFC 3444 Information Model Data Model 9 May 2007

Existing Models Information Models: Data Models: Graph Theory ITU-T G.805 (functional elements) Originally for network connections, but extended to describe networks Data Models: GMPLS: switching based on labels CIM: describe access networks asset management 9 May 2007

Layer schema based on G.805 IP layer Ethernet layer SONET layer UTP fiber layer Ethernet/ SONET switch End host 9 May 2007

10 GigE Reconsiliation Sublayer (RS) Describe All Layers? P802.3ae LLC MAC Control MAC 10 GigE Reconsiliation Sublayer (RS) XGXS PCS PMA PMD Medium WIS XGMII XAUI 9 May 2007

Or Only Possible Incompatibilities? Ethernet LAN PHY Medium WAN PHY 9 May 2007

Why Multi-layer NDL? Target applications: Visualization Path finding (find incompatibilities. E.g. conflicting wavelengths, different adaptation, incompatible MTU sizes) Fault isolation (required network connection description) The last two items require multi-layer network descriptions. 9 May 2007

Multi-Layer NDL Layer schema is used to describe technologies (thus does not describe technologies itself) Flexible (can describe technologies in multiple ways) Non-goals: Packet networks (MAC, IP): describes those as large broadcast networks (not true for IP) Physical properties: very limited concept of regeneration But: can be included with other schemas (that’s the strength of RDF) Flexible: Incompatibilities change over time 9 May 2007

Technologies Test cases for the layer schema: IP layer Ethernet (MAC + LAN/VLAN layers) ATM (AAL5/VCI + VPI (NNI/UNI) + cell layers) SONET/SDH (15 (!) layers as RFC 4606) WDM (Lambda + Fiber layers) Copper (UTP) layer Bundle layer (multiple fibers in a single duct) And even: PPP, MPLS, L2TP, 802 Wireless 9 May 2007

Applications in Development Configuration of devices Path Walk (given an end-point, find the destination) Fault Isolation Path Finding (must be a combination of topology, technology constraints, policy and scheduling/reservation) http://ndl.uva.netherlight.nl/ 9 May 2007