Method for triggering updating mechanism in multi-link transparent Internet and data forwarding device

The invention discloses a method for triggering updating mechanism in the multi-link transparent Internet and a data forwarding device. When link state of a route bridge changes, update can be timely triggered no matter route cost is changed or physical link state is changed into UP or DOWN; and link state package (LSP) is retransmitted and a forwarding table is recalculated. The triggered updated mechanism when the link state is changed is added on the basis of the original ISIS (link-state routing protocol) protocol, link convergence time in the multi-link transparent Internet is shortened, forwarding performance is improved and energy is saved.