Pass-through multicast admission control signaling

摘要

In general, techniques are described for simplifying admission control signaling between subscriber devices, access nodes, and service edge routers to facilitate subscriber-specific admission control for multicast streams. In one example, a service edge router receives a service request and accesses a subscriber profile to determine whether the requesting subscriber is authorized to receive the service. Upon authorization, the service edge router returns the service request to the access node in a substantially similar form in which the service request was received. The access node receives the service request on a service edge router-facing interface, indicating the service edge router has granted authorization for the subscriber device to receive multicast traffic associated with the multicast group identified within the service request. The access node therefore modifies internal mapping tables that determine local elaboration of multicast traffic associated with the multicast group to include an interface to the subscriber device.

主权项

1. A method comprising:
receiving, by a network device, a first multicast service signaling message that specifies a multicast group; determining, by a data plane of the network device, that the first multicast service signaling message carries layer three (L3) multicast service signaling information; determining, by the data plane of the network device, whether the first multicast service signaling message was received on a first layer two (L2) interface connecting the network device to an upstream services router or on a second L2 interface connecting the network device to a downstream subscriber device; in response to determining that the first multicast service signaling message was received on the first L2 interface connecting the network device to the upstream services router, filtering, by the data plane of the network device, the first multicast service signaling message to a control plane of the network device for processing by the control plane of the network device; and modifying, by the control plane of the network device, multicast filter information in the data plane of the network device in accordance with the L3 multicast service signaling information to affect replication and forwarding, to the downstream subscriber device, by the data plane of the network device, multicast traffic associated with the multicast group.