Link selecting method and apparatus

The invention discloses a link selection method, which comprises following steps: acquiring link delay parameters of each link node; and selecting the link delay parameters as the selection basis of a constrained shortest path first CSPF algorithm when the link is needed to be selected to construct a multi-protocol label switch traffic engineering MPLS TE tunnel. The invention discloses node equipment used as a head node for selecting link to a destination link node. By using the invention, the TE tunnel is constructed by using the link delay as the basis of CSPF for selecting path, such that the constructed tunnel after the link delay change can be re-optimized to a link having small delay, thereby satisfying the requirement for constructing the tunnel for tasks sensitive to time delay, such as audio and video tasks.