Name: draft-venkata-ipfrr-sspa-00
Title: IP Fast Reroute using Stitched Shortest Paths Algorithm (SSPA)
State: Active
Authors: Venkata Naidu
Group: Individual Submissions (none)
Date: 2004-07-06
This document describes a practical mechanism to implement IP fast reroute
using dynamic SPF to compute local and remote loop free nexthops
efficiently. Upon link failure, all the destinations reachable via the
primary nexthop will be forwarded to alternative loop free nexthop, if any.
If the alternative nexthop is remote, packet will be forwarded using any
connectionless (for example, IP-in-IP) or connection-oriented (for example,
MPLS) tunnels. This mechanism doesn't impose any new protocol
message/capability exchange. It is shown that simple changes to existing
IGP shortest path computation and routing table structures are sufficient
to achieve the desired functionality. More over, routers which implement
the proposed mechanism can co-exist and can be fully backward compatible
with existing unmodified routers.
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