Fast reroute for multiple label switched paths sharing a single interface
US8077726B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2009 |
| Grant date | Dec 13, 2011 |
| Priority date | — |
| Expiry date | Nov 10, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W40/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Techniques are described for maintaining a forwarding information base (FIB) within a packet-forwarding engine (PFE) of a router, and programming a packet-forwarding integrated circuit (IC) with a hardware version of the FIB. Entries of the hardware version identify primary forwarding next hops and backup forwarding next hops for the LSPs, wherein the packet-forwarding IC includes a control logic module and internal selector block configured to produce a value indicating a state of the first physical link. The selector block outputs one of the primary forwarding next hop and the backup forwarding next hop of the entries for forwarding the MPLS packets based on the value in response to the packet-processing engine addressing one of the entries of the FIB for the LSPs. Packets are forwarded with the PFE to the one of the primary forwarding next hop and the backup forwarding next hop output by the selector block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.