4. Preferences between several backup next-hops
In some network topologies, LFA and RLFA can find several next-hops to offer protection. RFC 5286 [ IETF 5286 ] defines criteria for selecting the next-hop to be used, e.g. choosing a next-hop offering protection against node failure, rather than a next-hop offering only protection against link failure.
Following the first (R)LFA deployments, it has become clear that this choice does not always correspond to what the network operator would like to do.
For example, figure 16 illustrates a topology where router R3 has two LFAs to protect the 10 Gbit/s link R1-R3: via the 10 Gbit/s link R3-R5 or via the 1 Gbit/s link R3-R4. For an...
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Preferences between several backup next-hops
Topology Independent Loop Free Alternate (TI-LFA)
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).
Also in our database
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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