Detecting a label-switched path outage using adjacency information
US7702810B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2003 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Jan 12, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/645
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Outages in a label-switched path (LSP) are detected quickly using adjacency information, such as IGP “hello neighbor” queries. Protocols, such as IGP can be instructed to check certain adjacencies more frequently. For example, a node in an LSP can determine a next downstream node in the LSP as an adjacency, check that adjacency much more frequently, and in the event that the adjacency is lost (due to a down link, a down interface, or a down node), switch any LSPs that have the adjacency to a failover path or route. Since these checks need not be performed using hardware signaling, outages of shared media interfaces, such as Ethernet and Gigabit Ethernet, can be checked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.