Robust multicast broadcasting

摘要

A method and system for multicasting IPTV channels includes using both a designated and a redundant network routing device. When the designated routing device detects that an MCDN network connection to an IPTV multicast source is unavailable, the designated routing device reduces its designation priority to a lower value. A message is sent to the redundant routing device with an instruction to increase its designation priority to a higher value. After the designation priorities have been modified, the designated routing device may serve as a new redundant routing device, while the redundant routing device may serve as a new designated routing device. The routing devices may remain in the new configuration, even after interrupted network connections are restored.

主权项

1. A multicasting method, comprising:
detecting that a first network connection to a multicast source is unavailable to a primary routing device and that a redundancy link between the primary routing device and a redundant routing device is unavailable; reducing a designation priority of the primary routing device; and requesting, via a switching network, the redundant routing device to increase its designation priority.