| 摘要 |
In a transport network having a plurality of edge devices and core devices, a main instance of a protocol is used for shortest path and tree computation. A multicast tree is defined per Virtual Service Network (VSN) to distribute Link State Data Base (LSDB) updates. Multicast trees are built using a secondary instance of the protocol, wherein each VSN multicast tree represents a separate instance of the secondary instance of the protocol. LSDB updates that only apply to members of a VSN are distributed using the multicast tree for that VSN. The transport network may be a Shortest Path Bridging (SPB) network and the protocol may be an Intermediate System to Intermediate System (ISIS) protocol. The multicast tree may be for topology updates internal to the SPB network, and may be for a Layer 2 (L2) VSN or Layer 3 (L3) VSN. |
