Fast failover recovery for stackable network switches
US7756015B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 13, 2007 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Jul 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L43/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A stack unit for a stackable network switch, the stack unit having corresponding methods and computer programs, comprises a network port to exchange packets with a network; two stacking interfaces each to exchange the packets over a respective stacking link with another stack unit, wherein each stacking interface is assigned to the other stacking interface as an alternate stacking interface; and a forwarding engine to transfer the packets among the stacking interfaces and network port; wherein when one of the stacking links is down, the respective stacking interface toggles a loop flag in each packet received from the forwarding engine, and returns each received packet to the forwarding engine; and wherein the forwarding engine transfers each packet received from one of the stacking interfaces to the respective alternate stacking interface when the loop flag for the packet is set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.