Path Diversity ! Number of paths for a packet to transit between two - PDF document

Nov 13, 2022 •101 likes •160 views

In Search for Path Diversity in ISP Networks Renata Teixeira, Keith Marzullo, Stefan Savage, Geoffrey M. Voelker UC San Diego Internet Measurement Conference 2003 Path Diversity ! Number of paths for a packet to transit between two points

In Search for Path Diversity in ISP Networks Renata Teixeira, Keith Marzullo, Stefan Savage, Geoffrey M. Voelker UC San Diego Internet Measurement Conference 2003 Path Diversity ! Number of paths for a packet to transit between two points " Inside an autonomous system network (ISP) " Fully link and PoP (Point of Presence) disjoint paths " Observed at IP level ! Applications " Robustness, resilience to failures " Traffic engineering ! How much path diversity is there in real networks? IMC’2003 2 1
Path Diversity inside an AS Recife Point of Presence (PoP) PoP-disjoint paths Link-disjoint paths Brasília Rio de Janeiro Given an ISP network topology, use standard graph algorithms to compute path diversity. São Paulo IMC’2003 3 Topologies Studied ! Inferred topologies (Rocketfuel) " Nine router-level ISP topologies (incl. Sprint) " Reconstruct PoP-level topology ! Exact Sprint network topology " PoP-level topology of the continental US backbone network IMC’2003 4 2
Inferring ISP Topology ISP Network -Choose vantage points and destinations probing -Perform a set of traceroutes traces -Clean-up traces processing -Collapse interfaces into routers -Insert reverse edges Inferred ISP Topology IMC’2003 5 Path Diversity in Inferred Sprint Topology s P o P f o s r i a p f o n o i t At least five link-disjoint c a paths between all pairs of PoP r f e v i t a l u m Inferred u C Number of link-disjoint paths IMC’2003 6 3
Inferred vs. Exact Path Diversity s s P P o o P P f f o o s s r r i i a a p p Inferred topology has f f o o 1.25 to 4.4 times more There are at least four n n o o link-disjoint paths link-disjoint paths between i i t t c c a almost 90% of pairs of PoPs a r r f f e e v v i i t t a a l Exact l u u m m Inferred Inferred u u C C Number of link-disjoint paths Number of link-disjoint paths IMC’2003 7 Accuracy of Inferred Sprint Topology Exact Sprint -Lack of vantage points Topology -Incomplete traceroutes -Missed: 58.57% probing -Added: 37.14% -Changes in the path during a probe Links: traces -Obsolete DNS -Missed: 8.57% -Added: 608.57% processing -Missed: -- -Added: 717.14% -Incorrect alias resolution Inferred Sprint -Adding reverse links Topology IMC’2003 8 4
Summary ! Large diversity in path diversity! " Depends on network design ! High level of path diversity in Sprint network " 90% of PoP-pairs have at least 4 link-disjoint paths ! Extracting path diversity is challenging " Inferred topologies are not representative of path diversity " Getting real data is unrealistic IMC’2003 9 Warning Inferred topologies should be used carefully! " Need to understand limitations of the data " Impact on relevant topological properties IMC’2003 10 5

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