Method for distributing tag, computing route distance and implementing back-up switching in ring network by multiprotocol tag
A technology of multi-protocol labels and label switching paths, which is applied in the field of backup and switching, and can solve the problems of slow speed, slow detection speed, and low utilization rate of optical fiber resources.
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no. 1 example
[0111] The first embodiment provided by the present invention is described in conjunction with the ring network shown in Figure 2, and its implementation process specifically includes:
[0112] Step 201: Based on the label distribution protocol, assign two labels to the nodes on the ring network, and start from the nodes on the next ring, distribute the two labels to each node on the ring network clockwise and counterclockwise respectively. node.
[0113] Step 202 , the upper-ring node obtains two tags issued by the lower-ring node along the clockwise ring and the counterclockwise ring.
[0114] LDP usually works in the working mode of downstream autonomous label allocation + free label retention. Starting from the next ring node on the ring network, such as node A in Figure 2, the LDP protocol can assign two labels to the FEC (forwarding equivalence class) corresponding to the address of node A, and move clockwise and counterclockwise respectively distribution,
[0115] Wh...
no. 2 example
[0133] For the situation that the outer node of the ring is connected to a lower ring node on the ring network as shown in Figure 4 (there is a direct or indirect connection relationship), the present invention provides a second embodiment, including:
[0134] Step 301, when the label mapping information of the out-of-ring node reaches the next-ring node on the ring network, the next-ring node obtains corresponding label mapping information.
[0135] An MPLS node outside the ring is only connected to one node on the ring (lower ring node). When node A in Figure 3 has a direct / indirect connection relationship, the FEC label mapping corresponding to the address of the outer node first reaches the lower ring node a.
[0136] Step 302: Based on the label distribution protocol, according to the corresponding label mapping information obtained by the lower-ring nodes, assign two labels to the lower-ring nodes on the ring network, and start from the lower-ring nodes, and distribute t...
no. 8 example
[0180] Aiming at a method for calculating routing distance on a ring network using multi-protocol label switching technology provided by the present invention, the eighth embodiment provided by the present invention includes:
[0181] Step 1. Based on the label distribution protocol, assign two labels to a forwarding equivalence class FEC of a node on the ring network, and set a distance parameter for it.
[0182] Step 2. Starting from the node on the lower ring, the two tags are distributed clockwise and counterclockwise to nodes adjacent to the node on the lower ring on the ring network.
[0183] Step 3. After receiving the label, the node judges whether the FEC mapped to the label is its own, and if so, invalidates the allocated label, and stops sending the label along the clockwise and counterclockwise rings respectively ; Otherwise, add 1 to the distance parameter, and continue to send the two labels to the next node along the clockwise and counterclockwise rings respecti...
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