Resilient attachment to provider link state bridging (PLSB) networks

摘要

A system for interfacing a client system in a first network domain with a Provider Link State Bridging (PLSB) domain includes at least two Backbone Edge Bridges (BEBs) of the PLSB domain. Each BEB is an end-point of a connection in the first network domain to the client system and an end-point of at least a unicast path in the PLSB domain. An inter-node trunk is provided in the PLSB domain for interconnecting the BEBs. A phantom node is defined in the PLSB domain and is notionally located on the inter-node trunk. Each of the BEBs is configured such that: an ingress packet received from the client system via the connection in the first network domain is forwarded through a path notionally rooted at the phantom node; and an egress packet destined for the client system is forwarded to the client system through the connection in the first network domain.

主权项

1. A method of interfacing a Client System (CS) with a network domain, the CS including an Aggregator function for load spreading ingress traffic originating from the CS across two or more parallel links of a Link Aggregation Group (LAG), the method comprising:
providing a set of two or more peer edge nodes of the network domain, each one of the set of peer edge nodes including: a local LAG port hosting a corresponding LAG link connected to the CS; and
at least one port hosting an inter-node trunk connecting the node to each of the other ones of the set of peer edge nodes; assigning a media access control (MAC) address to the LAG; computing a respective path through the network domain from each peer edge node to at least one predetermined destination address, for carrying traffic to or from the CS; and at each peer edge node, installing forwarding state such that:
ingress traffic received from the CS is forwarded, including the MAC address assigned to the LAG as a source address, via the path to the at least one predetermined destination address; andegress traffic having the MAC address assigned to the LAG as a destination address is forwarded to the CS via the local LAG port, if the local LAG port is operational, and otherwise via the inter-node trunk to another one of the set of peer edge nodes.