NDLI: IP Fast ReRoute: Loop Free Alternates Revisited

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IP Fast ReRoute: Loop Free Alternates Revisited

Content Provider	CiteSeerX
Author	Császár, András Enyedi, Gábor Tapolcai, János Rétvári, Gábor
Abstract	Abstract—IP Fast ReRoute (IPFRR) is the IETF standard for providing fast failure protection in IP and MPLS/LDP networks and Loop Free Alternates (LFA) is a basic specification for implementing it. Even though LFA is simple and unobtrusive, it has a significant drawback: it does not guarantee protection for all possible failure cases. Consequently, many IPFRR proposals have appeared lately, promising full failure coverage at the price of added complexity and non-trivial modifications to IP hardware and software. Meanwhile, LFA remains the only commercially available, and therefore, the only deployable IPFRR solution. Deployment, however, crucially depends on the extent to which LFA can protect failures in operational networks. In this paper, therefore, we revisit LFA in order to give theoretical insights and practical hints to LFA failure coverage analysis. First, we identify the topological properties a network must possess to profit from good failure coverage. Then, we study how coverage varies as new links are added to a network, we show how to do this optimally and, through extensive simulations, we arrive to the conclusion that cleverly adding just a couple of new links can improve the quality of LFA protection drastically.
File Format	PDF
Access Restriction	Open
Subject Keyword	Topological Property Added Complexity Non-trivial Modification Basic Specification Ip Fast Reroute Lfa Protection Good Failure Coverage Full Failure Coverage Theoretical Insight Practical Hint Possible Failure Case New Link Ietf Standard Fast Failure Protection Lfa Failure Coverage Analysis Mpls Ldp Network Significant Drawback Many Ipfrr Proposal Ip Hardware Abstract Ip Fast Reroute Operational Network Loop Free Alternate Deployable Ipfrr Solution
Content Type	Text

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