Multiprotocol label switching traffic engineering tunnel establishing method and device

A method for establishing a Multiprotocol Label Switching traffic engineering MPLS TE tunnel, comprising:

• sending, by a first routing device, a first identifier to a second routing device, so that the second routing device acquires first path information according to the first identifier, wherein the first identifier is an identifier of a first Multiprotocol Label Switching traffic engineering MPLS TE tunnel, the first path information is path information of the first MPLS TE tunnel, and the first MPLS TE tunnel is an MPLS TE tunnel from a first virtual private network VPN instance on the first routing device to a second VPN instance on the second routing device;
• receiving, by the first routing device, a path message that is sent by the second routing device and is used to establish a second MPLS TE tunnel, wherein the second MPLS TE tunnel is an MPLS TE tunnel from the second VPN instance to the first VPN instance, and path information of the second MPLS TE tunnel is obtained by reversing the first path information;
• and
• sending, by the first routing device, to the second routing device a reserved message corresponding to the path message.

A second routing device, comprising:

• a first identifier receiving unit, configured to receive a first identifier sent by a first routing device, wherein the first identifier is an identifier of a first Multiprotocol Label Switching traffic engineering MPLS TE tunnel, and the first MPLS TE tunnel is an MPLS TE tunnel from a first virtual private network VPN instance on the first routing device to a second VPN instance on the second routing device;
• a first path information acquiring unit, configured to acquire first path information according to the first identifier, wherein the first path information is path information of the first MPLS TE tunnel;
• and
• a first tunnel establishing unit, configured to reverse the first path information to acquire second path information, and establish a second MPLS TE tunnel according to the second path information, wherein the second MPLS TE tunnel is an MPLS TE tunnel from the second VPN instance to the first VPN instance.

A first routing device, comprising:

• a second identifier sending unit, configured to send a first identifier to a second routing device, so that the second routing device acquires first path information according to the first identifier, wherein the first identifier is an identifier of a first Multiprotocol Label Switching traffic engineering MPLS TE tunnel, the first path information is path information of the first MPLS TE tunnel, and the first MPLS TE tunnel is an MPLS TE tunnel from a first virtual private network VPN instance on the first routing device to a second VPN instance on the second routing device;
• a path message receiving unit, configured to receive a path message that is sent by the second routing device and is used to establish a second MPLS TE tunnel, wherein the second MPLS TE tunnel is an MPLS TE tunnel from the second VPN instance to the first VPN instance, and path information of the second MPLS TE tunnel is obtained by reversing the first path information;
• and
• a reserved message sending unit, configured to send to the second routing device a reserved message corresponding to the path message.