Method for distinguishing virtual line packets from multi-protocol label switching packets
A multi-protocol label, virtual circuit technology, applied in the field of distinguishing virtual circuit packets, which can solve problems such as inability to provide services and exhaustion of available labels.
Inactive Publication Date: 2008-03-26
IND TECH RES INST
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However, when the number of virtual private networks increases or when the number of connected provider edge routers increases, resulting in an increase in the number of virtual circuits and label-switched paths, the available labels of the provider edge routers may be quickly exhausted and services cannot be provided.
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[0061] As mentioned above, the virtual circuit technology can adopt the MPLS technology, including adopting the header format of the MPLS technology as shown in FIG. 2 . According to Internet RFC 3985, the time-to-live field of the virtual circuit header is set by the application (application specific), and according to Internet RFC 3032, when the MPLS packet passes through the MPLS device, it will check this 8 The value of the time-to-live field in bits, and the value of this field is subtracted by 1. Moreover, if the value of this field is 0, the packet will not be forwarded any more.
[0062] In other words, general applications will only set this field to a positive integer between 1 and 255, and will not set it to 0. Therefore, the value of the time-to-live field of the MPLS packet received by the MPLS egress device must be greater than or equal to 1. Also, the value of this field must be less than or equal to 254, not equal to 255.
[0063] Therefore, the present inve...
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The invention discloses a method for distinguishing virtual circuit packet from multi-protocol label switching packet that utilizes the specific value of time-to-live field to distinguish the virtual circuit packet so as to increase the virtual circuit label space and expand the maximal number of virtual circuit and label exchanging route which are capable of existing synchronously. At an access device of the virtual circuit, the invention sets the time-to-live field of the header of the virtual circuit packet as a specific value when a packet is encapsulated. While at an exit device of multi-protocol label exchanging, whether the value of time-to-live of the pocket header is the specific value is checked upon receiving the pocket. If the value of time-to-live of the pocket header is the specific value, the pocket is a virtual circuit pocket and belongs to the label space of the specific value. The method of distinguishing virtual circuit packet from multi-protocol label switching packet of the invention is capable of dividing label values of the internal header and the external header into separated and independent label field spaces and expanding the maximal number of virtual circuit and label exchanging route which are capable of existing synchronously.
Description
technical field [0001] The present invention relates to a method for distinguishing virtual wire (pseudowire, PW) packets from multi-protocol label switching (multi-protocal label switching, MPLS) packets. Background technique [0002] In a packet-switched network, a packet transmitted from a source address to a destination address may be transmitted through multiple intermediate network nodes, such as switches or routers. If the intermediate network node is familiar with the destination address, the packet will be delivered to the appropriate next hop. If the intermediate network node is not familiar with the destination address, the packet may be transmitted to a different port of the network node than the port on which the packet was received. [0003] The multi-protocol label switching technology sets labels on the packets to be transmitted, and follows the established label switched path (label switched path), and passes the packets to the next label switching router (...
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Login to View More IPC IPC(8): H04L12/56H04L29/06H04L12/46H04L45/50
Inventor 蔡奋燊侯廷昭徐伟伦
Owner IND TECH RES INST