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Routers configure their paths based on the Link State Database (LSDB) in order to meet service requirements and Quality of Service (QoS) guarantee. Internet routing can be categorized into intra domain routing and inter domain routing, and QoS should be guaranteed both at the intra and inter domains for end-to-end QoS guarantee. The LSDB can be easily managed and updated at the inter domain routing in which link state information is not large. On the other hand, routing information is too much to be managed in case of using conventional intra domain routing for inter domain routing destined for large networks. The present Internet uses Border Gateway Protocol (BGP) to solve the problem. However, the BGP is not suitable for inter domain QoS support because of its path vector base. This paper proposes QoS guaranteed inter domain routing using link state information in which the LSDB can be efficiently managed, and also shows its performance evaluation.