NSI Topology Wishes

OGF Lyon Sep 2011

Jerry Sobieski

NSI Topology requirements(a non-exhaustive and general set of observations…)

• Must support the existing NSI model• Inter-domain Data plane: NSI Networks, NSI Endpoints (STPs), NSI Peerings (SDPs) • Inter-domain to intra-domain mapping (abstraction?)• Control plane: NSA-Network mappings,

• Must support path finding• Two stage PF: “select path, confirm path” process.• Data plane topology and transfer functions• Control plane (service tree) topology (?)

• Must support distributed [autonomous] management of topology• Each domain must be able to decide what information it is willing to announce, and • Each domain must be able to decide with whom it is willing to exchange topology• The processes must scale globally.

• Must support summarization and abstraction• Multi-layer data plane path summarization – • Switching (Transfer function) abstraction/generalization

• Must support non-congruent topology views• Differnent agents have different views – all should be valid views

• We need a “grouping” capability within an NSI topology • Groups can combine, e.g. VLAN sets on different ports – perhaps on deiffnert nodes – into a single object that has a

shared constraint.

NSI preferences

• The topology description:• Simple grammar – easily understood • Common and easily processed syntax/format

• Should support virtualization of topology…• Details/specifics tbd…

– Clarity of terminalogy wrt physical, logical,