Method and apparatus for manipulating VLAN tags
US6515993B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1999 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | May 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L49/352
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An integrated multiport switch operating in a packet switched network provides the capability to alter VLAN tags on a port by port basis. An internal rules checker (IRC) analyzes the header of a data frame to determine the frame type: untagged, VLAN-tagged, or priority-tagged. The IRC searches the untagged set table for the set of ports that are untagged for a particular VLAN. The IRC passes a forwarding descriptor that includes the frame type and a operational code (opcode) to a Port Vector FIFO logic (PVF). The PVF is responsible for creating a new opcode that instructs a dequeuing logic to add, remove, modify the VLAN tag, or send the frame unmodified. The opcodes generated by the PVF are individualized for each output port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.