Title of Invention

A PACKET SWITCHED NETWORK

Abstract

A packet-switched network, comprising: a Private Network Access Point (PNAP) (20) having a customer side and a service provider side; at least a first customer (1) and a second customer (2) connected to the customer side ofthePNAP(20); at least one service provider (A, , N) connected to the service provider side of the PNAP (20); and an interconnected network system accessible to said service provider (A, , N) and to said first and second customers; wherein said PNAP (20) is adapted to exchange traffic between said first and second customers (1,2) wherein traffic is not transiting over said service provider (A, , N).

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION (See Section 10, rule 13) "A PACKET - SWITCHED NETWORK" INTERNAP NETWORK SERVICES CORPORATION of TWO UNION SQUARE, 601 UNION STREET, SUITE 1000, SEATTLE,WA98101-4064 U.S.A., AMERICAN Company The following specification particularly describes the nature of the invention and the manner in which it is to be performed : - PRIVATE NETWORK ACCESS POINT ROUTER FOR INTERCONNECTING AMONG INTERNET ROUTE PROVIDERS CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to US patent application serial number 09/512,127, filed February 24, 2000. Which is a continuation-in-part of copending application serial number 09/375,255 filed on August 16, 1999, incorporated herein by reference, which is a continuation of serial number 08/922,954 filed on September 3, 1997, now U.S. Patent No. 6,009,081, incorporated herein by reference. Priority is claimed to 09/512,127 and 09/375,255. BACKGROUND OF THE INVENTION Field of the Invention This invention pertains generally to routing information packets in a network involving a plurality of traffic carrying networks, and more particularly to an improvement in routing described in U.S. Patent 6,009,081. Description of the Background Art The present invention is an improvement on the invention of improvement in routing described in U.S. Patent 6,009,081, and assigned to the assignee hereof. Additional background information can be found the aforesaid patent, as well as in the book entitled "Internet Routing Architectures" by Bassam Halabi, New Riders Publishing, 1997, which is hereby incorporated herein by reference. As indicated in U.S. Patent No. 6,009,081, column 6, lines 62-66, a PNAP or "Private Network Access Point' can be thought of as being made up of two halves. One half connects to customers. The other half connects to NSPs or "National Service Providers". The Internet is a network of networks. A PNAP contains an ASimilater that determines the Internet interconnection matrix. ASimilater servers residing within the PNAP collect and collate the routing data received from Network Service Providers (NSPs) to build a database of how the Internet is interconnected. The database shows the NSPs connected to the PNAP are interconnected as well as how they are connected to their customers. The PNAP receives between two customers of the same PNAP to be exchanged through the PNAP witliout transiting over the Internet. FIG. 4 is a schematic diagram of a customer multi-homed to a PNAP and a plurality of NSPs in accordance with the invention. DESCRIPTION OF THE INVENTION Referring more specifically to the drawings, for illustrative purposes the present invention will now generally be described in connection with the system configuration, setup and operational methodology shown in FIG. 1 through FIG. 4. It will be appreciated that the systietn way vary as to configuration, and that the method may vary as to the specific steps and sequence, without departing from the basic inventive concepts disclosed herein. Referring first to FIG. 1, in accordance with an embodiment of the invention a first PNAP 20 and second PNAP 20a are both shown as a circle with a vertical dashed line 21 dividing it in half. While more customers would typically be connected to the PNAPs 20,20a, the left half of the PNAPs 20, 20a are shown connected to two customers 1, 2 as an example to simplify the discussion. Furthermore, while two PNAPs 20, 20a are shown, there could be one or any other number of PNAPs. While customers 1, 2 are both shown connected to two PNAPs, a customer may be connected only to one PNAP or any other number of PNAPs. Note also in this regard, that the two customers are considered to be "multi-homed" because they are connected to more than one PNAP. In addition, customers 1, 2 each have a second link that is connected to the Internet 22. This is also considered to be a "multi-homed" configuration. It will be appreciated, however, that it is not necessary for either customer 1 or customer 2 to be multi-homed to employ all of the inventive attributes described herein. Also, while PNAP 20 will be referred to herein for simplicity, the discussion is applicable to PNAP 20a as well. In the configuration shown, the right half of the PNAP 20 is connected to a plurality of NSPs A, B, C, D,... N which, in turn, form the Internet 22 to which Internet users, such as destinations 3,4 are also connected. Note that the NSPs A-N do not exchange traffic among themselves through the PNAP 20. Traffic exchanges between NSPs A-N takes place at public or private peering points (not shown). The customers 1, 2 typically route their traffic through the PNAP 20 from the left half to the right half. The PNAP 20 then selects the path from the customers 1, 2 to the destinations 3, 4. From U.S. Patent No. 6,009,081, it will be understood that the PNAP 20 contains an ASimilater that determines how everyone on the Internet 22 is connected to everyone else. Hereinafter, the term "ASimilater" will be used synonymously with the term "ASsimilator" in that patent. It will also be understood that the Border Gateway Protocol, version 4 protocol (BGP4) used therein encompasses the concept of a "Global Routing Table" which may be defined as the list of all routes visible to each provider, both of its customers as well as its peers and their customers, of everyone to which they are connected. Briefly, an ASimilater server inside the PNAP 20 receives a data "dump" of the Global Routing Table from each of its NSPs A-N, and collates the data together to build a database of how the Internet 22 is interconnected. The database shows how all of the NSPs A-N are connected together as well as connections to their customers. Once the ASimilater has populated this database, it uses the forward path or reverse path algorithm defined in U.S. Patent No. 6,009,081 to determine which routes are NSP A's customers, which are NSP B's customers, and so on, for all of the NSPs. In effect, the ASimilater "mines' this database. To summarize: 1. The ASimilater takes a dump of the Global Routing Table from each NSP A-N. 2. The ASimilater collates the data from each NSP's perspective of the Global Routing Table. 3. The ASimilater builds a summed Global Routing Table database of the Internet 22's interconnection matrix. 4. The ASimilater determines which routes are NSP A's customers and so on for all customers and for all other NSPs B-N. As a clarification, note that eacl NSP is also sending routes of all other NSPs to which it is connected. The routing table inside the PNAP 20 also maps a plurality of routes from customer 1 t customer 2 that go through the NSPs A-N. In accordance with the present invention, if neither customer 1 nor customer 2 is mult homed and those customers wish to communicate with each other, traffic will be exchang between those customers through the PNAP 20 without ever transiting over the backbones the NSPs A-N. In the case of sending information from customer 1 to customer 2, the routi table inside the PNAP 20 would list the direct connection from customer 1 to customer through the left half of the PNAP 20 over the dotted path 25 as the optimum route. This means that communications between customer 1 and customer 2 who are connected to the PNAP 20 would always use the dotted path 25 as the preferred path unless a failure or flaw prevents that path from being used, in which case traffic between those customers would be exchanged through the Internet. Accordingly, data packets would typically flow from customer 1 to the PNAP 20 and directly to customer 2 widiout traversing any of the NSPs A-N that comprise the Internet 22. This is illustrated in FIG. 2 and FIG. 3, which are method flow charts. In FIG. 2, the method begins at block 30 and proceeds to block 31 which is the step of causing the router within the PNAP to list the direct route through the PNAP as one of its routes between two customers connected to the PNAP. The step of the next block 32 is causing the level of preference for the direct path to be higher than for any other routes between the two customers. The step of the next block 33 is causing the router protocol to select the direct route as being the best path between the two customers. Finally, the last block 34 of FIG. 2 is "end". Similarly for FIG. 3, the method begins at block 36. The first step in block 37 is causing the customer router to forward a packet from customer 1 to customer 2 over the PNAP link. The next step in block 38 is causing the PNAP router to forward the packet from customer 1 over the direct PNAP path to customer 2 without transiting a service provider backbone. Finally the last block 40 of FIG. 3 is "end". The potential for unacceptable path latency is reduced by this direct connection between customer 1 and customer 2. Path latency can, for example, result from delay between the time when a device receives a frame and the time that frame is forwarded out the destination port, or the delay caused by a shift to a more circuitous path due to an outage. With regard to exchanging information between, for example, customers 1, 2 and destinations 3, 4, usually there will be more than one route from the customers 1, 2 to the destinations 3, 4. Therefore, the routers within the PNAP are used to forward packet traffic through the Internet 22 in an optimized fashion. The routers build routing tables that contain their distillation of the summed Global Routing Table resulting in the best paths to all the destinations from the PNAP's perspective. They both advertise and receive route information to and from other routers. The routers keep track of next hop information that enables a data packet to reach its destination. A router that does not have a direct physical connection to the destination checks its routing table and forwards the packet to its .next hop; that is, a router that it is directly connected to and is closer to that destination. This process repeats until the traffic reaches its destination. In a multi-homed configuration as shown in FIG. 1, if customer 1 wishes to send a packet to destination 3, it will see a link 23 to the Internet 22 and a link 24 to the PNAP 20. As part of the BGP4 protocol, customer 1 inherently has complete control over the outbound routing of its traffic communications in this configuration. As such, said customer may set the BGP4 local preference on the routes received by its router to destination 3 in order to cause it to prefer a particular link. For example, if destination 3 is connected to NSP D, customer 1 may set the preferences within its router to prefer link 24 based on link 24 being the optimum link. Otherwise, link 23 to NSP D may be the preferred link. However, in the event that a fault or failure appears on the preferred link, diversity considerations will cause the other link to be used instead. In order for the customer to be able to set the preferences within its router to cause it to prefer a particular link, the customer needs routing information to know which path is optimum. Therefore, in a multi-homed configuration with the PNAP and another provider, the customer is given access to ASimilater data over its BGP feed to the PNAP. This is done so that the PNAP customer can effectively use both their PNAP and their other NSP pipe. Without the additional ASimilator data in the form of BGP communities on the customer's BGP feed from the PNAP, they are left with attempting to push traffic over the PNAP and provider pipes in a sub-optimal fashion. Again, it may be preferred for a customer to use its pipe to NSP D for communicating with destinations that are connected to NSP D and to use the PNAP (and its external connections to NSPs A-N) for all other destinations. The optimized and distilled Global Routing Table would be sent to the PNAP customer. In this example, the BGP4 attribute known as the "community" would be used to tag NSP C customer routes as determined by ASimilater with the PNAP NSP C customer community. Since the customer has complete control over outbound traffic, the customer can set the local preference in its router to tag a particular route of multiple identical routes from multiple sources as the preferred route. The higher the local preference, the more preferred the route. For example, on the inbound policy applied to the routes received from the PNAP, any routes tagged with the PNAP's community for NSP D could have their local preference set to 50 and every other route (not tagged) set to 150. On the BGP feed from NSP D,-the customer could leave all routes at local preference 100 which is the default. This allows the customer to optimize their routing so that the direct pipe to NSP D is used for destinations on NSP D and the PNAP 20 is used for other destinations, thus providing effective and optimized use of both the customer's PNAP and NSP pipes based on the ASimilater information related to said customer over the PNAP BGP feed. On the other hand, when the preferred link is over the PNAP 20 (e.g., when destination 3 is not a customer of NSP D to which customer 1 is also connected), the data packet is transmitted from customer 1 over link 24 to the left half of the PNAP 20. The PNAP routing infrastructure within the PNAP 20 will have determined a plurality of paths to destination 3. These different paths to the same destination are listed in a routing table along with a parameter indicating the degree of preference attached to each route of a set of the different paths. By manipulating the local preference component of the route selection process of the BGP4 protocol, the PNAP 20 picks the best path for the traffic to traverse to reach destination 3. The data packet leaves die right side of the PNAP 20 via the selected one of the NSPs A-N, follows the selected best path through the Internet 22, and reaches destination 3. Therefore, in accordance with the present invention, two customers connected to the same PNAP 20 see the PNAP 20 as the best path, and exchange traffic with each other through the PNAP 20 without ever going out over the backbones of the NSPs A-N. Or, if a PNAP customer is directly connected to a particular NSP to which a destination is also connected, the PNAP customer can utilize that NSP connection to send the traffic to the destination based on the ASimilater information received over the BGP peering with the PNAP. In the case of sending information from customer 1 to customer 2, the routing table inside the PNAP 20 would list the direct connection from customer 1 to customer 2 through the left half of the PNAP 20 over the dotted path 25 as the optimum route. This means that communications between customer 1 and customer 2 who are connected to the PNAP 20 should always use the dotted path 25 as the preferred path unless a failure or flaw prevents that path from being used. Thus far we have described what will be referred to as "generic" Diversity-*-. When a PNAP customer is multi-homed to more than one PNAP and one NSP, routing outbound traffic become increasingly complex. By way of additional background, the invention described in U.S. Patent No. 6,009,081 subscribes to the model of symmetrical routing of traffic. This method allows us to bypass the public NAPs for approximately ninety per cent of the traffic flowing in and out of our PNAPs with the associated benefit of much higher performance than is normal experienced in today's Internet. The way we accomplish this symmetrical when optimal routing of traffic is by use of our routing technology called ASimilater. Each PNAP has it's own BGP AS and is completely distinct from the routing perspective of the other PNAPs with no private backbone connecting the PNAPs. Each PNAP is, however, connected to the same fabric of NSPs as all other PNAPs. The levels of bandwidth to a PNAP may be larger or smaller depending on it's location but the fabric is the same. With that in mind, let us examine the routing of PNAP-SFJ as an example. First, assume that each PNAP is connected to the same fabric of NSPs as all other PNAPs. Generally speaking, routing of traffic inbound from an NSP over the pipe to said NSP is easy. All of these NSPs attach a higher local preference to the routes heard from their customers over those same routes heard from their peers. Routing outbound traffic in a massively multi-homed network is much more difficult. Faced with such a multiplicity of links, the question of how to route traffic in a tightly controlled fashion is one of great importance in attaining the highest performance. Note that we do not peer with the NSPs that we connect to, but are, full transit customers of each one. This allows us to receive each NSPs perspective on the global routing table. ASimilater collates that data together and builds an interconnection matrix of the entire Internet. With that information, ASimilater can then route traffic optimally from each PNAP. An additional function of ASimilater is to We optimize the connectivity between the PNAPs as well since we can use any of the NSPs connecting the PNAPs to route traffic between them. This allows us to choose the fastest NSP between any two PNAPs, and thus allows us to offer the optimal path between our customers and the Internet. In the case of Diversity-f, we offer our customers access to ASimilater data over their BGP feed to the PNAP 20 by use of the BGP community attribute. In other words, if a customer is connected to NSP C and a PNAP, we can offer our customer all of NSP C and NSP C's customers routes tagged with a specific community InterNAP community, in this case 6993:XXX. That information allows our customer to route traffic destined to NSP C and NSP C customers over the NSP C link and all other traffic routed over the PNAP connection. This allows a customer to enjoy the same performance gains of symmetrical routing of traffic as PNAP even over a pipe not connected to the PNAP 20. Referring also to FIG. 4, in the customer 5 topology there is a connection to NSP A, a connection to NSP B and a connection to InterNAP (PNAP-SFJ). In this topology, we recommend the following configuration: (a) NSP A customer routes over the NSP A link. (b) NSP B customer routes over the NSP B link. (c) All others over the PNAP link. In order for this to occur, we send the customer NSP A and NSP B routes tagged with the following communities: NSP A: 6993:NSP A NSPB: 6993:NSPB For clarity, let's create the table of the local pref values to use in our B3GP. Table 1 NSPB NSP A PNAP NSPB 80 NSP A 40 PNAP 40 45 75 90 15 45 150 Setting the fall-through local pref values to half of the primary assists in understanding from what peer a route is being heard when perusing the BGP table. For example, in Table 1 all NSP A routes are assigned a local pref of 90 and all of the other routes heard from NSP A are assigned a local pref of 45. If you were to see a route tagged at a local pref of 45 in your IBGP, that would signify a non-NSP A route announced to the customer over the customer's BGP peering with NSP A. The net effect of this local pref hierarchy is that of the routes that we know are not NSP B or NSP A, highest local pref wins on the PNAP link. The fall-through local pref value is used in the case of multiple routes heard over > 1 of your connections. Multi-homed customers of the PNAP, NSP A, and NSP B would use the PNAP and, if that link was not available, the NSP A link followed by NSP B. Multi-homed customers of NSP B and NSP A would, in the example above, use NSP A followed by NSP B. Whether using NSP A or NSP B in the case of a multi-homed customer of both is entirely at the customer's discretion. That behavior is easily modifiable by switching the primary and fall-through local pref sets of NSP A and NSP B. Example 1 The following is an example of implementing this approach with NSP A. NSP A peer: neighbor xxx.xxx.xxx.xxx remote-as neighbor xxx.xxx.xxx.xxx send-community neighbor xxx.xxx.xxx.xxx remote-as NSP A neighbor xxx.xxx.xxx.xxx version 4 neighbor xxx.xxx.xxx.xxx distribute-list 1 out neighbor xxx.xxx.xxx.xxx route-map NSP A-IN in neighbor xxx.xxx.xxx.xxx route-map NSP A-OUT out neighbor xxx.xxx.xxx.xxx filter-list 1 out spr-bgw-02# ip as-path access-list 1 permit '$ ip as-path access-list 2 permit .* ip as-path access-list 10 deny *NSP A_NSP B_.* ip as-path access-list 10 deny *NSP A_XXXXX_.* route-map NSP A-OUT permit 10 ! only allow customer 5 IBGP sourced routes match as-path 1 route-map NSP A-IN permit 10 ! let's start by denying all routes we know are NSP B and PNAP-SEA ! and attaching a medium primary local pref. match as-path 10 set local-preference 90 route-map NSP A-IN permit 20 ! Any other routes attach a medium fall through local pref match as-path 2 set local-preference 45 Imernap Router; neighbor xxx.xxx.xxx.xxx remote-as XXXXX neighbor xxx.xxx.xxx.xxx send-community neighbor xxx.xxx.xxx.xxx version 4 neighbor xxx.xxx.xxx.xxx distribute-list 1 out neighbor xxx.xxx.xxx.xxx route-map PNAP-IN in neighbor xxx.xxx.xxx.xxx route-map PNAP-OUT out neighbor xxx.xxx.xxx.xxx filter-list 1 out ip community-list 1 deny 6993-.NSP A ; deny NSP A routes ip community-list 1 deny 6993:NSP B ; deny NSP B routes ip as-path access-list 1 permit *$ ip as-path access-list 2 permit .* route-map PNAP-OUT permit 10 ! only allow customer 5 1BGP sourced routes ! this is already being accomplished by the distribute-list ! out but this routemap is where you can adjust your AS ! pjrependings. match as-path 1 route-map PNAP-IN permit 10 ! any routes that we know are not NSP B, or NSP A tag highest ! primary local pref match community 1 set local-preference 150 route-map PNAP-IN permit 20 ! all else (NSP A, and NSP B routes) tag highest fall through ! local pref ! all else (NSP A, and NSP B routes) tag highest fall through ! local pref match as-path 2 set local-preference 75 NSP B Router: neighbor 144.228.98.5 remote-as NSP B neighbor 144.228.98.5 version 4 > neighbor 144.228.98.5 distribute-list 1 out neighbor 144.228.98.5 route-map NSP B-IN in neighbor 144.228.98.5 route-map NSP B-OUT out neighbor 144.228.98.5 filter-list 1 out ip as-path access-list 1 permit *$ ip as-path access-list 2 permit .* ip as-path access-list 10 deny "NSP B_XXXXX_.* ip as-path access-list 10 deny "NSP B_NSP A_.* ip as-path access-list 10 deny "NSP B_1664_.* route-map NSP B-OUT permit 10 ! only allow customer 5IBGP sourced routes ! this is already being accomplished by the distribute-list ! out but this routemap is where you can adjust your AS ! prependings. match as-path 1 route-map NSP B-IN permit 10 ! deny all NSP A, and PNAP routes and set a low ! primary local pref match as-path 10 set local-preference 80 route-map NSP B-IN permit 20 All else tag with a lowest fall through local pref. match as-path 2 set local-preference 40 There is another configuration which also requires special consideration; namely, where a multi-homed PNAP customer with generic Diversity + is connected to more than one PNAP. The local-preference hierarchy of generic Diversity + is intended to address the problem of multi-PNAP routing by creating an interlocking set of preference steps for path selection. In its default configuration, generic Diversity + supports up to two PNAP transit connections and multiple, other NSP transit connections. Each primary level of local-preference has a corresponding secondary value used as a backup should the primary become invalid. The complete hierarchy is shown below. Generic Diversity + Local Preference Hierarchy (Default) 400 PNAP Direct Customer High (Primary Link) 350 PNAP Direct Customer Low (Secondary Link) 300 Primary PNAP Direct NSP 250 Secondary PNAP Direct NSP 200 Primary PNAP Non-connected 150 Secondary PNAP Non-connected 100 Default Local Preference Value 90 Primary PNAP Direct NSP Backup 80 Secondary PNAP Direct NSP Backup 70 Primary PNAP Non-connected Backup 60 Secondary PNAP Non-connected Backup This hierarchy is applied as follows: For customers with no more than one link to a given PNAP, routes to customers of that PNAP are set to 400. When a customer has single links to multiple PNAPs, the value is still set to 400 and the length of the AS path is left to break the tie, meaning the direct link to the PNAP sourcing those customer routes will be used as the AS path will be shorter. If a customer has multiple links to the same PNAP, then routes over the primary link to customers of that PNAP will be set to 400, while routes over the secondary ink to those same customer routes will be set to 350. Routes belonging to NSPs and their customers directly connected to the primary PNAP are set to 300, while routes belonging to NSPs and their customers directly connected to the secondary PNAP are set to 250. This results in traffic being sent through the primary PNAP if the primary PNAP has a given NSP in its border fabric. If the secondary PNAP has an NSP in its border fabric not common to the primary PNAP, or if an NSP common to them both fails at the primary, the traffic will be sent through the secondary for those destinations. For destinations within NSPs which are not part of the border fabric of the primary PNAP routes are set to 200. Similar routes from the secondary PNAP are set to 150. Should an NSP connection at the primary PNAP fail, routes to that NSP through the primary PNAP will be set to 200, ramer than 300. If an NSP connection at the secondary PNAP fails, routes to that NSP through the secondary PNAP will be set to 150, rather than 250. The default value of 100 is generally not used for routes through a PNAP and is instead allocated for cases in which a customer has a connection to another NSP in addition to a PNAP. The values below 100 are used for customer NSP routes heard through the PNAP. The routes heard via the primary PNAP from the NSP to which the customer has a direct connection are set to 90. The same routes heard from the secondary PNAP are set to 80. Both of these cases assume the PNAPs have the NSP in their border fabric. If the customer has a connection to an NSP not found in the border fabric of the primary PNAP, those routes heard through the primary PNAP for destinations within that NSP are set to 70. If such is the case with the secondary PNAP, those routes are set to 60. Determining Primary and Secondary In a simple multi-PNAP scenario, a customer is connected to more than one PNAP in a given city or region and die primary and secondary PNAPs can be determined based on traffic levels within the PNAPs, provider fabric, or other concerns. However, when the multiple PNAPs are not all geographically close, a simple primary/secondary configuration may result in sub-optimal routing both in and out of the customer network. In cases when a customer is connected to multiple, geographically diverse PNAPs the preferred configuration is to have multiple primaries, one per region. In this way, PNAP NSPs will use their IGP cost for inbound traffic and the customer can similarly use their own IGP cost for outbound traffic. Care must be taken to properly announce prefixes to control regional traffic flows. Customers with such disperse PNAP connectivity should announce both their aggregate networks as well as more specific, regional prefixes. As an example, consider a customer with sites in both LAX and NYC with their own backbone connection between them. Each site connects to one PNAP in their area. The customer has been allocated 192.168.0.0/16 and has internally allocated 192.168.0.0/17 for the LAX site and 192.168.128.0/17 for the NYC site. From the LAX PNAP they would announce both 192.168.0.0/16 and 192.168.0.0/17. From the NYC PNAP they would announce both 192.168.0.0/16 and 192.168.128.0/17. If the customer wished to avoid any traffic -to or from external destinations from transiting their backbone, they would instead advertise only the more specific prefixes (192.168.0.0/17 and 192.168.128.0/17) and not the aggregate (192.168.0.0/16), This multiple primary PNAP model can be extended to an arbitrary number of regions, but within a single region, there must be a single primary. Example 2 (Configuration for a Multi-PNAP Customer) In the example below assume the customer is connected to two PNAPs, A and B. A is the primary, with connections to NSP C, NSP D, while B is the secondary, with connections to NSP C, NSP D, and NSP E. PNAP Data for Customer Configuration: PNAP A Autonomous System Number: XXXXX Border 1 Next Hop: 10.8.230.1 Internal/Customer Networks: 10.6.0.0/16 192.168.4.0/24 (AS 12005) 192.168.16.0/20 (AS 5507) NSP Fabric: NSP D (AS 1239) NSP C (AS 701) PNAPB Autonomous System Number: Border 2 Next Hop: Internal/Customer Networks: NSP Fabric: 6993 172.18.24.33 172.18.0.0/16 172.20.4.0/22 (AS 13461) NSP D (AS 1239) NSP C (AS 701) NSP E (AS 3561) Example 3 (BGP Routes Selected at Customer) Customer-CPE >sho ip bgp BGP table version is 3063602, local router ID is 10.8.230.2 Status codes: s suppressed, d damped, h history, * valid, > best, Origin codes: i - IGP, e - EGP, ? - incomplete internal Network Next Hop Metric *> i9.2.0.0/16 10.8.230.1 0 * 172.18.24.33 0 *>il0.8.0.0/16 10.8.230.1 0 * 172.18.24.33 0 * 24.116.4.0/23 10.8.230.1 0 *>i 172.18.24.33 0 *>il37,.99.0.0 10.8.230.1 0 * ■ I 172.18.24.33 0 * 172.18.0.0 10.8.230.1 0 *>i 172.18.24.33 .0 > * 172.20.4.0/22 10.8.230.1 0 *>i 172.18.24.33 0 *>U92.168.4.0 10.8.230.1 0 * 172.18.24.33 0 *> H92.168.16.0/20 10.8.230.1 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 LocPrf Weight 300 0 250 400 150 200 250 200 150 200 400 200 400 400 150 400 Path XXXXXXXXi 6993 XXX i XXXXXi 6993 1239 XXXXX i XXXXX 1239 3561i 6993 3561 i XXXXX 1239 209 i 6993 1239 209 i XXXXX XXX 6993 i 69931 XXXXX XXX 6993 13461 i 69931346H XXXXX 12005 i 6993 1239 XXXXX 12005 i XXXXX 5507 i , 172.18.24.33 0 150 0 6993 1239 XXXXX 5507 1 Detail of BGP Route Information for Specific Prefixes Customer-CPE>sho ip bgp 10.8.0.0 BGP routing table entry for 10.8.0.0/16, version 1304669 Paths: (2 available, best #2) 6993 1239 XXXXX 172.18.24.33 from 172.18.24.33 (172.18.24.1) Origin IGP, metric 0, localpref 150, valid, external XXXXX 10.8.230.1 from 10.8.230.1 (10.8.230.1) Origin IGP, metric 0, localpref 400, valid, external, best Customer-CPE>sho ip bgp 137.99.0.0 BGP routing table entry for 137.99.0.0, version 1304669 Paths: (2 available, best #2) 6993 1239 209 172.18.24.33 from 172.18.24.33 (172.18.24.1) Origin IGP, metric 0, localpref 150, valid, external XXXXX 1239 209 10.8.230.1 from 10.8.230.1 (10.8.230.1) Origin IGP, metric 0, localpref 200, valid, external, best Although the description above contains many specificities, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the presently preferred embodiments of this invention. Thus the scope of this invention should be determined by the appended claims and their legal equivalents. Therefore, it will be appreciated that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more." All structural, chemical, and functional equivalents to the elements of the above-described preferred embodiment that are known to those of ordinary skill in ihe art are expressly incorporated herein by reference and are intended to be encompassed by the present claims. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element herein is to be construed under the provisions of 35 U.S.C. 112, sixth paragraph, unless the element is expressly recited using the phrase "means for." We Claim: 1. A packet-switched network, comprising: a Private Network Access Point (PNAP) (20) having a customer side and a service provider side; at least a first customer (1) and a second customer (2) connected to the customer side ofthePNAP(20); at least one service provider (A, , N) connected to the service provider side of the PNAP (20); and an interconnected network system accessible to said service provider (A, , N) and to said first and second customers; wherein said PNAP (20) is adapted to exchange traffic between said first and second customers (1,2) wherein traffic is not transiting over said service provider (A, , N). 2. A network as claimed in claim 1, wherein the PNAP (20) routing infrastructure within said PNAP (20) contains a roating table listing all routes to all destinations in the network, along with a parameter indicating the degree of preference attached to each route of a set of identical routes from multiple sources. 3. A network as claimed in claim 1, wherein said PNAP (20) routing infrastructure lists a direct connection between said first and second customers (1,2) within said customer side of the PNAP (20), and wherein said PNAP (20) routing infrastructure sets the level of preference higher for said direct connection than for any other routes between said first and second customers (1,2). 4. A network as claimed in claim 1. wherein at least one of said customers (1,2) is connected to a service provider (A, , N) who is also connected to the service provider side of the PNAP (20) so that said customer is multi-homed connected to said PNAP (20) and at least another PNAP (20a) or other network. 5. A network as claimed in claim 4, wherein said multi-homed customer (1,2) is provided a routing table listing all routes to all destinations in the network, along with a community attribute denoting the preferred reachability of a given route over the customer non-PNAP (20) connection. 6. A network as claimed in claim 5, wherein said multi-homed customer (1,2) can utilize ASimilater data received over a BGP feed from the PNAP (20) and send traffic to a destination served by said service provider (A, , N) through said customer's connection to said service provider (A, , N) by using said routing table to set route preferences in a router maintained by said customer (1,2). 7. The network as claimed in claim 1, wherein: a plurality of service provider connected to the service provider side of the PNAP (20); and an interconnected network system accessible to said plurality of service provider (A, , N)s and to said first and second customers (1,2); wherein the PNAP (20) routing infrastructure within said PNAP (20) contains a routing table listing all routes to all destinations in the network, along with a parameter indicating the degree of preference attached to each route of a set of identical routes from multiple sources; wherein said PNAP (20) routing infrastructure lists a direct connection between said first and second customer (1,2) within said customer side of the PNAP (20). 8. A network as claimed in claim 7, wherein said PNAP (20) routing infrastructure sets the level of preference higher for said direct connection than for any other routes between said first and second customers (1,2). 9. A network as claimed in claim 7, wherein traffic between said first and second customers (1,2) is exchanged through the PNAP (20) without transiting over said service provider (A, ,N). 10. A network as claimed in claim 7, wherein at least one of said customers (1,2) is connected to a service provider (A, , N) who is also connected to the service provider side of the PNAP (20) so that said customer (2) is multi-homed connected to said PNAP (20) and at least another PNAP (20a) or other network.. 11. A network as claimed in claim 10, wherein said multi-homed customer is provided with said routing table listing all routes to all destinations in the network, along with a community attribute denoting the preferred reachability of a given route over the customer non-PNAP (20) connection. 12. A network as claimed in claim 11, wherein said multi-homed customer (1,2) can utilize ASimilater data received over a BGP feed from the PNAP (20) and send traffic to a destination served by said service provider (A, , N) through said customer's connection to said service provider (A, , N) by using said routing table to set route preferences in a router maintained by said customer (1,2). 13. The network as claimed in claim 1, wherein said one of the customer (1,2) is connected to a service provider (A, , N) who is also connected to the service provider side of the PNAP (20) so that said customer (1,2) is multi-homed; wherein said multi-homed customer (1,2) is provided a routing table listing all routes to all destinations in the network, along with a community attribute denoting the preferred reachability of a given route over the customer non-PNAP connection; and wherein said multi-homed customer (1,2) can utilize the ASimilater data received over the BGP feed from the PNAP (20) and send traffic to a destination served by said service provider through said customer's connection to said service provider by using said routing table to set route preferences in a router maintained by said customer. 14. The network as claimed in claim 1, further comprising : a plurality of PNAPs (20,20a); wherein one of said customers (1,2) is connected to the customer side of one of said PNAPs; and a plurality of network service providers (A, , N) is connected to a service provider side of said one of said PNAPs, said one of said PNAPs causing packets originated by said PNAP customer to enter into said one of said PNAPs from said customer side and be routed directly to a selected one of said plurality of network service providers (A, , N), said selected one of said network service providers (A, , N) containing a destination network which the PNAP customer desires to communicate with said PNAPs causing a response packet originated from the destination network to be forwarded from the destination network back to the originator PNAP customer over the exact same path, thus providing symmetric routing. 15. The network as claimed in claim 14, wherein said plurality of network service providers have local preferences set for causing said network service providers (A, , N) to select direct routing to said one of said one of said PNAPs for causing response packets to be routed over the exact same return path as a packet received over a forward path. 16. The network as claimed in claim 1, further comprising: means for causing packets originated by a private network access point (PNAP) customer (1,2) to enter into at least one of said PNAPs; means for causing entering packets to be routed directly to a provider (A, ...,N) which contains a desired destination network; and means for causing a response packet from said destination network to be routed directly back to the PNAP customer (1,2) over the exact same path. 17. The network as claimed in claim 16, further comprising: means for setting local preferences of the provider (A, .. .,N) to cause the provider to select direct routing back to the at least one of said PNAPs. 18. The network as claimed in claim 1, further comprising: a plurality of PNAPs; wherein one of said private network access point (PNAP) customers (1,2) is connected to the customer side of one of said plurality of PNAPs; a plurality of PNAP network service providers (A, , N) directly connected to a service provider side of said plurality of PNAPs; and at least one non-PNAP network service provider (A, , N) not directly connected to said plurality of said PNAPs, said PNAPs causing packets originated by said private PNAP customer to enter into said PNAP from said first side, said PNAPs routing packets addressed to a destination within said non-PNAP network service providers networks to a preselected one of said plurality of PNAP network service providers, said preselected one of said plurality of PNAP network service providers containing a route to the non-PNAP destination network which the private PNAP customer desires to communicate with, and PNAPs causing a response packet originated from the destination to be forwarded from the destination back to the private PNAP customer over the exact same path, thus providing symmetric routing. 19. The network as claimed in claim 18, in which said plurality of PNAP network service providers have local preferences set for causing said PNAP network service providers (A, , N) to select direct routing to said PNAPs for causing response packets to be routed over the exact same return path as a packet received over a forward path. 20. The network as claimed in claim 1, further comprising: means for causing packets originated by a private network access point PNAP customer to enter into one of said plurality of said PNAPs; means for causing entering packets addressed to a destination within a non PNAP network service provider's networks to be routed to a preselected one of a plurality of PNAP network service providers containing a route to the non PNAP destination; and means for causing a response packet originated from the destination to be forwarded from the destination back to the private PNAP customer (1,2) over the exact same path. 21. The network as claimed in claim 20, further comprising: means for setting local preferences of the plurality of PNAP network service providers (A, , N) to cause the PNAP network providers (A, , N) to select direct routing back to said one of said plurality of PNAPs. 22. A method for exchanging traffic in a packet-switched network, comprising: providing a Private Network Access Point (PNAP) (20) having a customer side and a service provider side; connecting at least a first customer (1) and a second customer (2) to the customer side of the PNAP (20); connecting at least one service provider (A, , N) to the service provider side of the PNAP (20); making an interconnected network system accessible to said service provider (A, , N) and to said first and second customers(l,2); and causing traffic between said first and second customers to be exchanged through the PNAP (20) without transiting over said service provider (A, , N). 23. A method as claimed in claim 22, wherein the PNAP (20) routing infrastructure within said PNAP (20) contains a routing table listing all routes to all destinations in the network, along with a parameter indicating the degree of preference attached to each route of a set of identical routes from multiple sources. 24. A method as claimed in claim 22, wherein said PNAP (20) routing infrastructure lists a direct connection between said first and second customers (1,2) within said customer side of the PNAP (20). 25. A method as claimed in claim 24, wherein said PNAP (20) routing infrastructure sets the level of preference higher for said direct connection than for any other routes between said first and second customers (1,2). 26. A method as claimed in claim 22, wherein at least one of said customers is connected to a service provider (A, , N) who is also connected to the service provider side of the PNAP (20) so that said customer is multi-homed connected to said PNAP (20) and at least another PNAP (20a) or other network. 27. A method as claimed in claim 26, further comprising providing said multi-homed customer with a routing table listing all routes to all destinations in the network, along with a community attribute denoting the preferred reachability of a given route over the customer non PNAP connection. 28. A method as claimed in claim 27, further comprising allowing said multi-homed customer to utilize ASimilater data received over the BGP feed from the PNAP (20) and send traffic to a destination served by said service provider (A, , N) through said customer's connection to said service provider (A, , N) by using said routing table to set route preferences in a router maintained by said customer (1, 2). 29. A method for exchanging traffic in a packet-switched network as claimed in 22, wherein the PNAP (20) routing infrastructure within said PNAP (20) contains a routing table listing all routes to all destinations in the network, along with a parameter indicating the degree of preference attached to each route of a set of identical routes from multiple sources; wherein said PNAP (20) routing infrastructure lists a direct connection between said first and second customers (1, 2) within said customer side of the PNAP (20). 30. A method as claimed in claim 29, further comprising causing traffic between said first and second customers (1, 2) to be exchanged through the PNAP (20) without transiting over said service provider (A, N). 31. A method as claimed in claim 29, wherein said PNAP (20) routing infrastructure sets the level of preference higher for said direct connection than for any other routes between said first and second customers (1,2). 32. A method as claimed in claim 29, wherein at least one of said customers (1,2) is connected to a service provider (A, , N) who is also connected to the service provider side of the PNAP (20) so that said customer is multi-homed connected to said PNAP (20) and at least another PNAP (20a) or other network. 33. A method as claimed in claim 32, further comprising providing said multi-homed customer with said routing table listing all routes to all destinations in the network, along with a community attribute denoting the preferred reachability of a given route over the customer non-PNAP connection. 34. A method as claimed in claim 33, further comprising allowing said multi-homed customer to utilize ASimilater data received over a BGP feed from the PNAP (20) and send traffic to a destination served by said service provider (A, , N) through said customer's connection to said service provider (A, , N) by using said routing table to set route preferences in a router maintained by said customer (1,2). 35. A method as claimed in claim 22, wherein one o'f said customer is connected to a service provider (A, , N) who is also connected to the service provider side of the PNAP (20) so that said customer is multi-homed; providing said multi-homed customer a routing table listing all routes to all destinations in the network, along with a community attribute denoting the preferred reachability of a I given route over the customer non-PNAP connection; and allowing said multi-homed customer (1, 2) to utilize the ASimilater,data received over the BGP feed from the PNAP (20) and send traffic to a destination served by said service providpr (A, , N) through said customer's connection to said service i provider (A, , N) by using said routing table to set route preferences in a router maintained by said customer. 36. A method as claimed in claim 22, further comprising: causing packets originated by a private network access point (PNAP) customer to enter into one of a plurality of PNAPs; causing entering packets to be routed directly to a provider which contains a desired destination network; and causing a response packet from said destination network to be routed back to the PNAP customer (1,2) over the exact same path. 37. A method as claimed in claim 36, further comprising: setting local preferences of the provider to cause the provider to select direct routing back to the one of a plurality of PNAPs. Dated thisl3th day of February 2002. HIRAL CHANDRAKANT JOSHI AGENT FOR APPLICANT

Documents:

abstract1.jpg

in-pct-2002-00182-mum-cancelled pages(03-08-2004).pdf

in-pct-2002-00182-mum-claims(granted)-(03-08-2004).doc

in-pct-2002-00182-mum-claims(granted)-(03-08-2004).pdf

in-pct-2002-00182-mum-correspondence(06-01-2005).pdf

in-pct-2002-00182-mum-correspondence(ipo)-(30-03-2007).pdf

in-pct-2002-00182-mum-drawing(03-08-2004).pdf

in-pct-2002-00182-mum-form 1(13-02-2002).pdf

in-pct-2002-00182-mum-form 13(17-12-2002).pdf

in-pct-2002-00182-mum-form 19(17-10-2003).pdf

in-pct-2002-00182-mum-form 2(granted)-(03-08-2004).doc

in-pct-2002-00182-mum-form 2(granted)-(03-08-2004).pdf

in-pct-2002-00182-mum-form 3(13-02-2002).pdf

in-pct-2002-00182-mum-form 5(13-02-2002).pdf

in-pct-2002-00182-mum-form-pct-ipea-409(03-08-2004).pdf

in-pct-2002-00182-mum-petition under rule 138(14-12-2004).pdf

in-pct-2002-00182-mum-power of attorney(18-12-2004).pdf