Abstract
An IP tunneling design scheme to reduce advertising delay in open shortest path first (OSPF) networks, in which the link load is required for traffic maintenance, is proposed. A controller and nodes are consisted in a network. A node sends an OSPF traffic engineering (OSPF-TE) advertisement when either link load or topology is changed. The controller determines and adjusts the routes in the network to avoid traffic congestion. The controller may experience delay in receiving advertisements due to OSPF forwarding delay. Therefore, route adjustment may be delayed. In the proposed scheme, an IP tunneling technique is used instead of the OSPF mechanism.
