Source: http://www.google.com/patents/US8064467?dq=6,073,142
Timestamp: 2015-05-03 10:53:45
Document Index: 167269317

Matched Legal Cases: ['application No. 2', 'application No. 2', 'application No. 200780025193', 'application No. 200680003986', 'application No. 2', 'application No. 06720174', 'application No. 07710455', 'application No. 07710455', 'application No. 07864928', 'application No. 07710455', 'application No. 06720175', 'application No. 07864928', 'application No. 2007']

This application is a continuation-in-part of U.S. patent application Ser. No. 11/347,810, filed Feb. 3, 2006, and entitled �Ethernet-based Systems and Methods for Improved Network Routing�, which claims the benefit of U.S. Provisional Application Ser. No. 60/650,312, filed Feb. 4, 2005, and entitled �Systems And Methods For Improved Network Routing�, both of which are incorporated herein in their entireties.
The term �backbone network� or �backbone� refers to a network that communicably connects two or more networks or subnetworks and provides communication traffic routing therebetween. A backbone network is typically geographically distributed to provide routing between multiple geographic sites. Thus, in some cases, a backbone network is a wide area network (WAN). Backbone networks include core routers and other nodes that facilitate packet routing.
A �customer network� or �provider network� are examples of third party networks that may interface with a provider edge network or device to thereby communicate across one or more backbone networks.
A �customer edge device� or �provider edge device� are devices that interface with third party networks, such as customer networks, and one or more backbone networks to route traffic between the third party networks and the one or more backbone networks. Typically, customer edge devices interface with one or more core nodes, such as core routers, in the backbone networks to route communication traffic to and from the backbone networks.
A �customer edge network�, �provider edge network�, or �peering edge network� are networks communicably between third party networks and one or more backbone networks, and include one or more customer edge devices. In some embodiments, a local area network (LAN) is communicably located between backbone network core nodes and customer edge network nodes.
Various systems and processes have been developed to provide backbone network routing between networks. These systems can be used individually or together to form a cost effective, scalable core backbone network and/or edge network. The systems include a multi-chassis Ethernet router (�MER�), a multiple parallel backbone configuration (�N�BB�), and a LAN in the middle (�LIM�) configuration,
After the Ethernet switches 102 are connected together, the packets and/or packet cells can be distributed to the different stages 104 of the matrix using flow based load balancing. Internal gateway protocols (�IGP�) can be used to implement the load balancing techniques. In some embodiments, the MER 100 can utilize equal cost load balancing, so that each third-stage box (i.e., L31, L32, L33 and L34) associated with a destination receives the same amount of traffic. For example, if boxes L1, L2 and L3 all communicate with a New York-based provider edge site or router, each box will receive the same amount of traffic. This technique is relatively easy to implement and scales well, when new MERs are implemented.
In another embodiment, an implementation of the MER 100 can use a control box or a route reflector to manage the MER 100. In some embodiments, the route reflector or control box can participate in or control routing protocols, keep routing statistics, trouble shoot problems with the MER, scale routing protocols, or the like. In one embodiment the route reflector can implement the routing protocols. So, instead of a third stage in a MER communicating with a third stage in another MER, a route reflector associated with a MER could communicate with a route reflector associated with the other MER to determine routing needs and protocols. The route reflector could utilize border gateway protocols (�BGP�) or IGP route reflection protocols could be used (e.g., the route reflector could act as an area border router).
FIG. 5 is another illustration of the Ethernet-based parallel core 502 in parallel with an existing MPLS core 504. External least cost routing protocol techniques, such as BGP techniques, can be used to select which backbone to use on a per destination basis. To illustrate with the embodiment of FIG. 5, destination addresses A.1 and A.2 are advertised through a customer edge network 506. Candidate routes are marked with a BGP community identifier, such as community string 508 or 510 (and IP next hop loopback address), as illustrated with advertisements 512 and 514, respectively. In the particular scenario shown in FIG. 5, the community strings are used in the least-cost routing process to route packets destined for address �A.1� through backbone 0 (BB0), and to route packets destined for address �A.2� through backbone 2 (BB2).
PE1 804 is labeled with site identifier �WDC�, which stands for Washington D.C. Thus, in the illustrated scenario. PE1 804 handles communications associated with customer networks in the Washington D.C area. The use of WDC, or any other specific site identifier, is merely for illustrative convenience, and it will be understood by those skilled in the art that the processes described here with respect to PE1 804 can be carried out by any provider edge device, regardless of the customer site. The description here relates to processes for routing packets to customer addresses when multiple backbone networks are employed. Therefore, although nodes at addresses A.X and B.X may be both sources and destinations for data, addresses A.X and B.X are referred to as �destination addresses� here for illustrative convenience.
In forming this advertisement, the second LAX-based core node 908 b reduces the cost associated with address L2 to be slightly less than the cost associated with L0. The second LAX-based core node 908 b includes a �redistribute� tag in the advertisement and communicates the advertisement to PE1.LAX 904 b. PE1.LAX 904 b creates a route map including an association between B.X, L2, and BB2 902 b. As such, when PE1.LAX 904 b receives packets that are addressed to B.X, PE1.LAX 904 b will first identify L2 as the least cost route to reach B.X, and will then determine that the second LAX-based core node 908 b is the least cost node to send the packets to.
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