Ingress protection for multipoint label switched paths

摘要

Techniques include providing ingress protection for multipoint label switched paths (LSPs). According to the techniques, a primary ingress node and a backup ingress node of a network are both configured to advertise a virtual node identifier of a virtual node as a next hop for a multicast source. Two or more egress nodes of the network then use the virtual node as a root node reachable through the primary ingress node to establish a multipoint LSP. After the multipoint LSP is established, the primary ingress node forwards traffic of the multicast source on the multipoint LSP. When failure occurs at the primary ingress node, the backup ingress node forwards the traffic of the multicast source along a backup path and onto the same multipoint LSP with the virtual node as the root node reachable through the backup ingress node. The techniques enable ingress protection without tearing down the multipoint LSP.

主权项

1. A method comprising:
advertising, with a primary ingress node of a network connected to a multicast source, a virtual node identifier that identifies a virtual node as a next hop for the multicast source through the primary ingress node; advertising, with a backup ingress node of the network connected to the same multicast source, the same virtual node identifier that identifies the same virtual node as the next hop for the multicast source through the backup ingress node; forwarding, with the primary ingress node, traffic of the multicast source on a multipoint label switched path (LSP) established between the virtual node as a root node and two or more egress nodes of the network; and based on a failure at the primary ingress node, forwarding, with the backup ingress node, the traffic of the multicast source through a backup path onto the same multipoint LSP with the virtual node as the root node.