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2. Loop Free Alternate (LFA)
2.1 Solution
The Fast ReRoute Loop Free Alternate (LFA) solution works in pure IP networks, and MPLS networks using LDP [ IETF 5036 ] or Segment Routing [ IETF 8402 ]. This is a purely local solution for the PLR router, requiring no functionality on other routers in the network.
The LFA principle is very simple. The idea is to find a neighboring router to which to send the packet in the event of a nominal path failure, in such a way that this neighbor will not forward the packet directly (using the same interface) or indirectly (via another path). In other words, the aim is to avoid creating a loop, hence the name "Loop...
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Loop Free Alternate (LFA)
Remote Loop Free Alternate (RLFA)
Bibliography
- (1) - FRANCOIS (P.), FILSFILS (C.), EVANS (J.), BONAVENTURE (O.) - Achieving sub-second IGP convergence in large IP networks. - ACM SIGCOMM Computer Communication Review, vol. 35, issue. 3, pp. 35-44, DOI : 10.1145/1070873.1070877 (2005).
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Standards and norms
- IETF OSPF Version 2. - IETF RFC 2328 - 1998
- IETF LDP Specification. - IETF RFC 5036 - 2007
- IETF Basic Specification for IP Fast Reroute : Loop-Free Alternates. - IETF RFC 5286 - 2008
- IETF IP Fast Reroute Framework. - IETF RFC 5714 - 2010
- IETF Loop-Free Alternate (LFA) Applicability in Service Provider (SP) Networks. - IETF RFC 6571 - 2012
- IETF Remote Loop-Free Alternate (LFA)...
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