Domain Isolation Through Virtual Network Machines

Abstract

A method and device for communicating information resources between subscriber end stations and nodes belonging to different network domains is described. The device instantiates different virtual network machines for different network domains using separate independently administrable network databases. Each of the administrable chores of the separate independently administrable network databases includes the assignment of access control and the configuration of the policies for those network databases. The policies include traffic filtering policies to indicate what kind of information payloads can be carried, traffic and route filtering policies to indicate what paths through the network will be used for each payload carried. Each of the network domains includes one of the different virtual network machines and each of the different network domains is virtually isolated from other network domains.

Description

CROSS-REFERENCE[0001]This is a divisional application of Ser. No. 11 / 869,746, filed Oct. 9, 2007, which is continuation of Ser. No. 10 / 461,761, filed Jun. 12, 2003, now U.S. Pat. No. 7,281,039, which is a continuation of Ser. No. 09 / 220,413, filed Dec. 24, 1998, now U.S. Pat. No. 6,609,153.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates in general to communications networks, and more particularly, to the operation of network devices that can operate in multiple virtual networks simultaneously.[0004]2. Description of the Related ArtNetwork Layering and Protocols[0005]A communication network provides information resources transfer services that transfer information resources among devices attached to the network. Information resources, as the term is used herein, includes any form of information that can be transmitted over a network for use by or with any end station or network device connected to the network. Information resources, for e...

AI Technical Summary

Problems solved by technology

The administration of even a single network domain can be quite complex.

The cost of administering a network, physical or virtual, can be enormous, and is often the largest cost item in the operations of a network.

Concerns arise about integrity, privacy, and security of data and network control information flowing across the shared resources at the lower layers.

The costs of administering these networks increases quickly with the number of virtual networks, their size, the complexity and compatibility of their individual policies, and increased demands for security, integrity, and isolation between domains.

When a network device is deployed to operate in multiple domains, its network database can become quite complex.

The cost of administering the network device increases significantly when the network database is more complex.

The cost of administration is already the most significant cost of operating many networks, and the trend toward greater complexity through greater use of virtual networking continues unabated.

Manual configuration involves human effort, which can become expensive, especially as the number of policies and their complexity increases.

The isolation between Networks A and B, whether physical or virtual, is lost when they are joined in Network C. This joining of the two Networks A and B may create challenges to the administration of combined Network C. For example, despite the joining of the two networks, there still may be a need to apply different or even conflicting policies to each of Networks A and B. In essence, the administrative challenge is to maintain the administrative integrity of the Network A domain and the administrative integrity of the Network B domain despite the fact that both of these networks are part of Network C and are no longer physically isolated from each other.

The sharing of a common set of physical or virtual network resources by several virtual networks increases the challenges of maintaining isolation and security of the individual virtual networks.

Therefore, there are ever increasing demands imposed upon network administrators, and vendors of networking equipment.

This intersection of three network domains creates the potential for the kinds of administration and policy challenges discussed above.

However, as explained above, different network domains may have different or perhaps even conflicting policies.

It will be appreciated that the complexity and difficulty in defining and administering the policy mechanisms used to achieve isolation can be great.

Another challenge in the administration of virtual networks arises because home or business end station users may wish to change the nature of their connections to the network from time to time.

Unfortunately, these changes often require intervention by a network administration authority to change the higher level binding between the end user station and the network.

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