Method to route multicast data in SPB network by establishing the virtual PIM adjacency across the SPB networks in a single PIM domain

摘要

Techniques disclosed herein include systems and methods that extend Protocol Independent Multicast (PIM) protocols to Shortest Path Bridging (SPB) technology. This includes connecting an IP multicast domain across an SPB network. SPB edge routers, also known as Backbone Edge Bridges, form virtual adjacencies with each other. As such, SPB edge routers maintain such PIM adjacency without sending Hello messages. Backbone Edge Bridges (BEBs) are discovered using null Intermediate System To Intermediate System (IS-IS) Internet Protocol Multicast (IPMC) type-length-value (TLV) control messages. Each PIM-enabled BEB records other PIM-enabled BEBs as an adjacent PIM-router in response to receiving a NULL IPMC TLV from those BEBs. Accordingly, PIM-enabled BEBs form a full mesh virtual adjacency between each other and can thereby encapsulate PIM control messages sent and received between two access networks connected to the SPB network.

主权项

1. A computer-implemented method for packet switching in a Shortest Path Bridging (SPB) network, the computer-implemented method comprising:
receiving a first control message at a first data switching device, the first data switching device functioning as a first Backbone Edge Bridge within a transport network using Shortest Path Bridging protocol, the first data switching device also functioning as a first Protocol Independent Multicast (PIM) router, the first data switching device connected to a first access network, the first control message originating from a second data switching device, the second data switching device functioning as a second Backbone Edge Bridge within the transport network, the second data switching device connected to a second access network; in response to interpreting the first control message as signaling that the second data switching device is also functioning as a second PIM router, adding the second data switching device to a record that indicates Backbone Edge Bridges within the transport network having PIM adjacency with the first data switching device; receiving a PIM Join control message at the first data switching device from the first access network; and encapsulating the PIM Join control message using Mac-in-Mac encapsulation and transmitting the PIM Join control message towards a PIM rendezvous point RP via the transport network.