FAST REROUTE IN MULTI-PROTOCOL LABEL SWITCHING TRAFFIC ENGINEERING NETWORK

摘要

In an example, multi-protocol label switching traffic engineering (MPLS TE) fast reroute (FRR) is implemented in an MPLS TE network. The MPLS TE network includes a bypass protection (BP)-label switching path (LSP) protecting a working LSP. A node receives a packet from an upstream adjacent node of the node in a working LSP. The packet includes a label which is an incoming label of the working LSP at the node. When detecting a downstream adjacent node of the node in the working LSP is unreachable, the node replaces the label in the packet with an outgoing label of a WP-LSP at the node, and forwards the packet in the WP-LSP which delivers the packet to an ingress node of a BP-LSP. The BP-LSP then delivers the packet to an egress node of the BP-LSP and the packet is forwarded from the BP-SLP to the working LSP.

主权项

1. A method for implementing multi-protocol label switching traffic engineering (MPLS TE) fast reroute (FRR) in an MPLS TE network, the MPLS TE network including a bypass protection (BP)-label switching path (LSP) protecting a working LSP, the method comprising:
receiving, at an at least one intermediate node of the working LSP, a packet including a label, wherein the label is an incoming label of the working LSP from an upstream adjacent node in the working LSP; replacing, at the at least one intermediate node, the label in the packet with an outgoing label of a wrapping protection (WP)-LSP when detecting a downlink adjacent node of the at least one intermediate node in the working LSP is unreachable, wherein the WP-LSP is in a reverse direction of the working LSP; and forwarding the packet with the outgoing label in the WP-LSP to an ingress node of the BP-LSP, wherein the ingress node of the BP-LSP forwards the packet via the BP-LSP to an egress node of the BP-LSP and the packet is forwarded from the BP-SLP to the working LSP.