Self-healing is the ability with which a routing system can restore or rebuild routes automatically after network failures without impacting on packet forwarding.Although existing intra-domain routing protocols can adapt to network failures somewhat

they can not satisfy user requirements because their convergence time ranges from several seconds to more than one hundred seconds.During the period of self-healing

network routes may be incorrect and even have black hole or loop which will lead to packet loss and impact network applications.In order to solve this problem

several intra-domain self-healing routing solutions have been proposed.After analyzing the problems of current intra-domain self-healing routing

we propose intra-domain self-healing routing model

and divide the solutions into five categories according to the model:weight change

flood restriction

fast reroute

multi-path and local reroute.Based on the analysis of some typical solutions in each category

we compared the features of these solutions and studied the availability of the solutions in detail.Finally

we discussed several key issues for further study.