The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 05, 2019
Filed:
May. 16, 2016
Cisco Technology, Inc., San Jose, CA (US);
Yi Yang, Morrisville, NC (US);
Alvaro E. Retana, Raleigh, NC (US);
James L. Ng, Mebane, NC (US);
Abhay Roy, Santa Clara, CA (US);
Alfred C. Lindem, Cary, NC (US);
Sina Mirtorabi, Santa Clara, CA (US);
Timothy M. Gage, Durham, NC (US);
Syed Khalid Raza, Fremont, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
In one embodiment, a first router determines whether an interface coupling the first router to one or more second routers is transit-only. When the interface is transit-only, the first router generates an Open Shortest Path First (OSPF) Link State Advertisement (LSA) that includes an address for the interface and a designated network mask. The designated network mask operates as a transit-only identification that indicates the address should not be installed in a Routing Information Base (RIB) upon receipt of the OSPF LSA at the one or more second routers. When the network is not transit-only, the first router generates an OSPF LSA that includes the address for the interface but does not include the designated network mask, to permit installation of the address in a RIB upon receipt of the OSPF LSA at the one or more second routers.