wheel + ring = reel: the impact of route filtering on the stability of policy routing

Cittadini, Luca; Battista, Giuseppe Di; Rimondini, Massimo; Vissicchio, Stefano

doi:10.1109/icnp.2009.5339677

Cited by 8 publications

(11 citation statements)

References 16 publications

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“…The strongest result concerning BGP safety prior to this work was by Cittadini et al [6]. They provide the necessary and sufficient conditions for safety with route filtering.…”

Section: B Bgp Without a Reel Unsafementioning

confidence: 91%

“…This is the same topology that appears as Figure 4 in the original work of Cittadini [6] as an example of a safe topology without a reel (the dispute wheel with pivot vertices 1, 2, and 3 is not a reel because each pivot vertex appears in three rim paths, violating Definition IV.1). However, the following oscillation may occur: This is a valid oscillation in the DPVP model where the spurious announcements may be caused, e.g., by the details of cluster-based hardware implementation of routers 1, 2, and 3.…”

Section: B Bgp Without a Reel Unsafementioning

confidence: 93%

“…Filtering allows each node to remove an arbitrary subset of paths from the list of permitted paths. They prove that instances that do not contain a dispute reel [6] are safe under any filtering, and if an instance contains a dispute reel, then there exists a filtering that allows oscillations. Note that these conditions become sufficient conditions for safety in the general setting without filtering.…”

Section: B Bgp Without a Reel Unsafementioning

confidence: 99%

“…In [6] it was shown that the necessary and sufficient condition for safety under filtering in the classical SPVP model is the absence of a particular type of dispute wheel called a dispute reel:…”

Section: B Safety With Filteringmentioning

confidence: 99%

“…We also define safety under filtering in the same way as [6], [8] do. DPVP is safe under filtering if it remains safe under removal of arbitrary subsets of paths from an arbitrary subset of the P v s (this generalizes the removal of arbitrary nodes and edges).…”

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confidence: 99%

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BGP safety with spurious updates

Suchara

Fabrikant

Rexford

2011

2011 Proceedings IEEE INFOCOM

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Abstract-We explore BGP safety, the question of whether a BGP system converges to a stable routing, in light of several BGP implementation features that have not been fully included in the previous theoretical analyses. We show that Route Flap Damping, MRAI timers, and other intra-router features can cause a router to briefly send "spurious" announcements of less-preferred routes. We demonstrate that, even in simple configurations, this short-term spurious behavior may cause long-term divergence in global routing. We then present DPVP, a general model that unifies these sources of spurious announcements in order to examine their impact on BGP safety. In this new, more robust model of BGP behavior, we derive a necessary and sufficient condition for safety, which furthermore admits an efficient algorithm for checking BGP safety in most practical circumstances -two complementary results that have been elusive in the past decade's worth of classical studies of BGP convergence in more simple models. We also consider the implications of spurious updates for well-known results on dispute wheels and safety under filtering.

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“…The strongest result concerning BGP safety prior to this work was by Cittadini et al [6]. They provide the necessary and sufficient conditions for safety with route filtering.…”

Section: B Bgp Without a Reel Unsafementioning

confidence: 91%

Section: B Bgp Without a Reel Unsafementioning

confidence: 93%

Section: B Bgp Without a Reel Unsafementioning

confidence: 99%

Section: B Safety With Filteringmentioning

confidence: 99%

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confidence: 99%

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