| 摘要 |
Extensions to the ES-IS protocol are described which include virtual nodes and virtual sub-network identifiers. Techniques for selecting a physical IS forwarder amongst multiple candidates in a virtual node may include tie-breaking mechanisms based on pre-emption values supported by the ES-IS extensions Embodiments allow integration between ES-IS based broadcast networks supporting the Internet Protocol (IP) and the Virtual Router Redundancy Protocol (VRRP). In some embodiments, this integration is accomplished in part by translating packet data units between ES-IS and versions of VRRP. In some such embodiments, nodes on an internetwork maintain concurrent state tables for ES-IS and VRRP.
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