MULTIPROTOCOL LABEL SWITCHING RING PROTECTION SWITCHING METHOD AND NODE DEVICE

摘要

According to an example, a MPLS ring protection switching method is applied to each node in an MPLS TP ring. In the method, an MPLS forwarding table entry configured for a working LSP and an MPLS forwarding table entry configured for a backup LSP of the working LSP are added into a first table, an MPLS forwarding table entry formed by cross connecting the working LSP and the backup LSP is added into a second table, a packet is received, the first table is searched when the node is in a normal forwarding state, and the packet is forwarded by using an MPLS forwarding table entry in the first table, the second table is searched when the node device is in a protection forwarding state, and the packet is forwarded by using an MPLS forwarding table entry in the second table.

主权项

1. A multiprotocol label switching (MPLS) ring protection switching method applied to a node in an MPLS transport profile (TP) ring, said method comprising:
adding an MPLS forwarding table entry configured for a working label switched path (LSP) and an MPLS forwarding table entry configured for a backup LSP of the working LSP into a first table; adding an MPLS forwarding table entry formed by cross connecting the working LSP and the backup LSP into a second table; and receiving a packet and detecting whether the node is in a normal forwarding state or a protection forwarding state,
searching in the first table when detecting that the node is in the normal forwarding state, and forwarding the packet by using an MPLS forwarding table entry in the first table; andsearching in the second table when detecting that the node is in the protection forwarding state, and forwarding the packet by using an MPLS forwarding table entry in the second table.