Technique for preventing routing loops by disseminating BGP attribute information in an OSPF-configured network
US8589573B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2006 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | Oct 28, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A novel technique is provided for preventing routing loops by disseminating Border Gateway Protocol (BGP) attribute information in an Open Shortest Path First (OSPF) configured network. Specifically, a new OSPF sub-type-length-value (TLV) is introduced for transporting a conventional BGP autonomous system (AS) path attribute through the OSPF-configured network. Like the BGP AS-path attribute, the new OSPF AS-path sub-TLV is configured to store a set of AS numbers corresponding to the AS path of one or more advertised routes. Thus, when a network device receives an OSPF link-state advertisement (LSA) containing the novel AS-path sub-TLV, the network device determines whether it resides in an autonomous system whose AS number is stored in the sub-TLV. If so, the network device does not install the LSA's advertised routes in its link-state database since the routes, if installed, could result in routing loops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.