Multicast echo removal
US6765907B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2002 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jun 26, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L49/351
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus is provided which processes upstream multicast packets and downstream multicast packets in a manner such as to avoid the problem of multicast echo which is generated from a host gateway. For upstream multicast packets, a method is provided which includes: extracting the source network address from the upstream multicast packet; storing said source network address in a table corresponding to the destination host gateway of the packet; and forwarding the upstream multicast packet to the destination network address. For downstream multicast packets, a method is provided which includes: accessing a table corresponding to the host gateway from which the packet was sent; determining if said source network address of the multicast packet is identical to an entry in said table; discarding the multicast packet if said source network address is identical to an entry in said table; and forwarding the multicast packet to said destination network address if said source network address is not identical to an entry in said table. This eliminates any downstream multicast packets which originated from one of the hosts coupled to the apparatus, and thus prevents multicast echo problems …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.