A method for managing a Transparent Interconnection of Lots of Links, TRILL, network, comprising: a target Routing Bridge, RB, in the TRILL network starting an interface of a layer-3 Virtual Local Area Network, VLAN, associating the interface of the layer-3 VLAN with a TRILL protocol through a command; notifying, by the target RB, the layer-3 VLAN as an interested VLAN of the target RB to an ingress RB in the TRILL network, and the target RB calculating and issuing a broadcast decapsulation flag for the layer-3 VLAN to all RBs in the TRILL network, wherein the interested VLAN is used for all RBs in the TRILL network for calculating and generating a unicast encapsulation table, a broadcast encapsulation table and a broadcast forwarding table for reaching the target RB according to the interested VLAN; wherein the broadcast encapsulation table is configured to encapsulate a layer-2 Ethernet frame into a TRILL broadcast data message; the unicast encapsulation table is arranged to encapsulate a layer-2 Ethernet frame into a TRILL unicast data message; the broadcast forwarding table is configured to forward a TRILL broadcast data message; a unicast forwarding table is arranged to forward a TRILL unicast data message; receiving, by the ingress RB in the TRILL network, an Ethernet frame which is sent by the layer-3 network manager and carries the layer-3 VLAN and Media Access Control, MAC, information of the interface of the layer-3 VLAN; if the MAC information of the interface of the layer-3 VLAN is on the ingress RB, encapsulating, by the ingress RB, the Ethernet frame into a first TRILL data message according to the unicast encapsulation table; or if the MAC information of the interface of the layer-3 VLAN is not on the ingress RB, encapsulating, by the ingress RB, the Ethernet frame into a first TRILL data message according to the broadcast encapsulation table, and forwarding the first TRILL data message to the target RB according to an acquired unicast forwarding table or the broadcast forwarding table; receiving, by the target RB, the first TRILL data message forwarded according to the broadcast forwarding table, determining, by the target RB, that the received first TRILL data message is a broadcast data message and the first TRILL data message is received from a VLAN having the broadcast decapsulation flag of the target RB, and decapsulating the first TRILL data message to obtain the Ethernet frame according to the broadcast decapsulation flag; or, receiving, by the target RB, the first TRILL data message forwarded according to the unicast forwarding table, and decapsulating the first TRILL message to obtain the Ethernet frame. a target Routing Bridge, RB, in the TRILL network starting an interface of a layer-3 Virtual Local Area Network, VLAN, associating the interface of the layer-3 VLAN with a TRILL protocol through a command; notifying, by the target RB, the layer-3 VLAN as an interested VLAN of the target RB to an ingress RB in the TRILL network, and the target RB calculating and issuing a broadcast decapsulation flag for the layer-3 VLAN to all RBs in the TRILL network, wherein the interested VLAN is used for all RBs in the TRILL network for calculating and generating a unicast encapsulation table, a broadcast encapsulation table and a broadcast forwarding table for reaching the target RB according to the interested VLAN; wherein the broadcast encapsulation table is configured to encapsulate a layer-2 Ethernet frame into a TRILL broadcast data message; the unicast encapsulation table is arranged to encapsulate a layer-2 Ethernet frame into a TRILL unicast data message; the broadcast forwarding table is configured to forward a TRILL broadcast data message; a unicast forwarding table is arranged to forward a TRILL unicast data message; receiving, by the ingress RB in the TRILL network, an Ethernet frame which is sent by the layer-3 network manager and carries the layer-3 VLAN and Media Access Control, MAC, information of the interface of the layer-3 VLAN; if the MAC information of the interface of the layer-3 VLAN is on the ingress RB, encapsulating, by the ingress RB, the Ethernet frame into a first TRILL data message according to the unicast encapsulation table; or if the MAC information of the interface of the layer-3 VLAN is not on the ingress RB, encapsulating, by the ingress RB, the Ethernet frame into a first TRILL data message according to the broadcast encapsulation table, and forwarding the first TRILL data message to the target RB according to an acquired unicast forwarding table or the broadcast forwarding table; receiving, by the target RB, the first TRILL data message forwarded according to the broadcast forwarding table, determining, by the target RB, that the received first TRILL data message is a broadcast data message and the first TRILL data message is received from a VLAN having the broadcast decapsulation flag of the target RB, and decapsulating the first TRILL data message to obtain the Ethernet frame according to the broadcast decapsulation flag; or, receiving, by the target RB, the first TRILL data message forwarded according to the unicast forwarding table, and decapsulating the first TRILL message to obtain the Ethernet frame.