Canonical name (CNAME) handling for global server load balancing
US11095603B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2018 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Sep 13, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L67/1021
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Canonical name (CNAME) handling is performed in a system configured for global server load balancing (GSLB), which orders IP addresses into a list based on a set of performance metrics. When the GSLB switch receives a reply from an authoritative DNS server, the GSLB switch scans the reply for CNAME records. If a CNAME record is detected and it points to a host name configured for GSLB, then a GSLB algorithm is applied to the reply. This involves identifying the host name (pointed to by the CNAME record) in the reply and applying the metrics to the list of returned IP addresses corresponding to that host name, to reorder the list to place the “best” IP address at the top. If the CNAME record in the reply points to a host name that is not configured for GSLB, then the GSLB sends the reply unaltered to the inquiring client.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.