Device and method for managing subscriptions to multicast transmissions

A method for managing requests for subscription to multicast transmissions in a communication network, the method comprising:

• establishing the communication network with at least two branches in a local area network that are interconnected by an interconnection device comprising an internal bridge device, at least one of the branches comprising at least one bridge device and each branch being connected to said interconnection device via a port of said internal bridge device,
• using a module of the interconnection device to prevent propagation of subscription requests between the two branches in the local area network,
• upon reception via one of the branches of a first request for subscription to a multicast transmission, using a subscription announcement module in the interconnection device to
• identify a port of said internal bridge device via which said first request is received and store in memory information representing said port in association with an IP address of said multicast transmission;
• and
• transmit a second request for subscription to said multicast transmission identified by said IP address via said port via which the first request for subscription to the multicast transmission was received.