NOTIFYING OF A LSP FAILURE

摘要

According to an example, in a method and apparatus for notifying a LSP, the downstream LSR detecting the link failure on the work LSP sends a SF message on the direction of the work LSP, so that the upstream LSR detecting the link failure on the work LSP receives the SF message and sends the packet via the protection LSP according to the SF message.

主权项

1. A method for notifying of a Label Switched Path (LSP) failure, applied to a Label Switching Router (LSR) in a ring network that uses Multi-Protocol Label Switching Transport Profile (MPLS TP), the ring network comprising at least one work LSP forwarding packets along a first direction and a protection LSP loop forwarding packets along a second direction, the first direction being opposite to the second direction, and the method comprising:
forwarding packets via the work LSP and detecting whether a link between the LSR and a neighbor LSR is failed; in response to detecting that a link between the LSR and a downstream neighbor LSR on the work LSP is failed and receiving a Signal Failure (SF) message sent by another LSR, taking an incoming working label of the another LSR on the work LSP as an inner layer label of a packet, taking an outgoing working label of the LSR on the protection LSP loop as an outer layer label of the packet, and sending the packet along the second direction via the protection LSP loop.