SCION Flashcards

1
Q

Intra ISD Path Exploration

A

Beaconing:

  • Core ASes initiate PCBs (Path-segment construction beacons) to traverse to lower ASes
  • Each PCB represents a path from core to current AS
  • PCBs are secured through origin auth. and MACs
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2
Q

Intra ISD Path registration

A

up path: AS selects path segments to announce as up-path segments for local hosts, registered at local path server
- AS selects path segments to announce as down-path segments for others, uploaded to core path server in Core AS

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3
Q

Path lookup (remote ISD)

A
  • host queries RAINS server for address of H -> H:
  • host contacts local path server to query path segments for -> up-path, core-path, down-path segments

remote ISD

  • if local path server has down-path not cached ask core path server
  • if core path server has down-path not cached ask remote core path server
  • eventually local host gets up, core and down-path
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4
Q

Interface Identifiers

A

Each AS assigns integer number to each interface that connects to neighboring AS.
Use internal routing protocol to connect between ingress and egress SCION border router

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5
Q

Hop field MAC verification

A

based on local AS secret key

over timestamp, flags, Exp Time, Ingress, Egress, hop field of previous AS)

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6
Q

Core AS duties

A
  • manage and distribute ISDs TRC
  • Issue certs for all AS inside ISD
  • provide connectivity to neighboring ISD
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7
Q

Low Latency connectivity

A

SCION can choose preferred path depending on application. Use low latency, low bandwith path for certain applications

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8
Q

Low Earth Orbit Satellite Network

A

Idea: use low orbit satellite to provide connectivity.
Problem: many satellites needed to provide full connectivity
SCION can integrate satellite network

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9
Q

control plane

A

deals with network topology and makes routing decisions. Responsible to discover paths, deal with route establishment, failures and policing.

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10
Q

data plane

A

responsible for packet forwarding that end hosts have injected into network. packets are forwarded based on routes established in the control plane.

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