Egress protection for label switched paths
US8259564B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2009 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Feb 15, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/507
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
This disclosure describes techniques for protecting an endpoint of a label switched path. In one embodiment, a system includes an ingress router, a primary egress router, backup router, and a point of local repair (PLR) router. The ingress router, the PLR router, and the first egress router form a first label switched path. The backup router provides protection for the primary egress router such that the backup router provides routing services for the first egress router when the first egress router is not available. The primary egress router and the backup router share an anycast IP address. The backup router advertises a route to reach the primary egress router, but upon receiving a packet intended for the primary egress router, the backup router identifies the destination of the packet and forwards the packet to the destination instead of the primary egress router along a different route.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.