CN104065578B - IP router processing method and device based on ASON optical network - Google Patents

Abstract

The present invention provides a kind of IP route processing method and device based on ASON optical network, build a broadcast subnet on ASON optical network, then this method comprises: the first IP backbone router receives the IP grouping sent by the first access network; The IP destination address in the IP packet, according to the longest prefix matching principle, queries the local routing information base, if the number of routing table entries matching the IP destination address is multiple, select a routing table from the multiple routing table entries entry as the optimal routing table entry, and the IP backbone router that advertises the optimal routing table entry as the second IP backbone router; query the local backbone router table, if there is an ASON connection from the first IP backbone router to the second IP backbone router ID, then according to the ASON connection ID, send the IP packet to the second IP backbone router through the ASON connection, so that the second IP backbone router sends the received IP packet to the second access network.

Description

An IP routing processing method and device based on ASON optical network

technical field

The invention relates to communication technology, in particular to an ASON optical network-based IP routing processing method and device.

Background technique

Currently, the Internet can be divided into two levels in terms of routing structure: Inter-domain and Intra-domain. For the inter-domain level, the Internet is composed of multiple autonomous systems (Autonomous Systems; AS for short). Wherein, each autonomous system is an independent management domain, which is composed of a group of routers and other network devices with the same routing policy connected to each other, and is usually owned by a certain Internet Service Provider (Internet Service Provider; ISP for short). In addition, each autonomous system corresponds to a number, which may be called an AS number, and the AS number is an unsigned integer. An intra-domain routing protocol or an inter-domain routing protocol is run in the autonomous system; for example, the intra-domain routing protocol is Open Shortest Path First (Open Shortest Path First; System to Intermediate System Routing Protocol; Abbreviation: IS-IS). The inter-domain routing protocol is Border Gateway Protocol (Border Gateway Protocol; BGP for short).

Specifically, BGP is responsible for exchanging routing messages between autonomous systems and selecting the best AS path to the destination network. For each destination network, a BGP router advertises routing information including multiple attributes to neighboring routers. Wherein, each destination network is represented by an IP address prefix, including a 32-bit IP address and address mask length. The routing information of each destination network includes attributes such as AS path (AS_PATH), next hop (NEXT_HOP), routing source (ORIGIN), and MED (Multiple-Exit-Discriminator). All of these attributes can affect routing decisions. In every routing update message, the AS_PATH, NEXT_HOP and ORIGIN attributes are mandatory. In addition, by using AS-level paths, BGP hides the internal topology and routing details of each AS, ensuring the scalability of the protocol.

At the same time, BGP can further perform incremental updates, that is, route update messages will be generated and notified only when routes change. In addition, BGP also allows flexible routing policies, that is, in addition to selecting routes based on the shortest AS path length, routers can also apply complex policies to affect the selection of the best route for each destination network, and whether to advertise the selected route to neighbors node. The flexibility of this strategy increases the complexity of BGP route selection.

However, the Internet inter-domain routing system is a large distributed system, and the propagation of routing information has a cascading effect. Due to the complexity of BGP and the Internet topology, this cascading effect may have a catastrophic impact on the Internet. For example, when the inter-domain link is attacked, it may cause the interruption of the BGP session and further pass the cascade The effect caused the collapse of the Internet. Therefore, at present, the Internet urgently needs a routing protocol system to make the Internet more secure.

Contents of the invention

The invention provides an ASON optical network-based IP routing processing method and device, which are used to solve the problem of Internet instability caused by adopting BGP in the prior art, and effectively improve the security of the Internet.

First aspect of the present invention provides a kind of IP route processing method based on ASON optical network, constructs a broadcast subnet on described ASON optical network, then described method comprises:

The first IP backbone router receives the IP packet sent by the first access network connected to the first IP backbone router;

The first IP backbone router queries the local routing information base according to the IP destination address in the IP group according to the longest prefix matching principle, and if the number of routing table entries matching the IP destination address is multiple, Then select a routing table item as the optimal routing table item from a plurality of routing table items, and use the IP backbone router of the optimal routing table item as the second IP backbone router;

The first IP backbone router queries the local backbone router table, and if there is an ASON connection identifier from the first IP backbone router to the second IP backbone router, according to the ASON connection identifier, the IP packet is passed through the The ASON connection corresponding to the ASON connection identifier is sent to the second IP backbone router, so that the second IP backbone router sends the received IP packet to the second interface connected to the second IP backbone router into the network.

Another aspect of the present invention provides a kind of IP route processing device based on ASON optical network, constructs a broadcast subnet on described ASON optical network, then this device comprises:

An access network routing module, configured to receive IP packets sent by the first access network connected to the IP routing processing device;

The backbone network routing module is used to query the local routing information base according to the IP destination address in the IP packet according to the longest prefix matching principle. If the number of routing table entries matched with the IP destination address is multiple, Then select a routing table item as the optimal routing table item from a plurality of routing table items, and use the IP backbone router of the optimal routing table item as the second IP backbone router;

The backbone routing module is also used to query the local backbone router table to determine whether there is an ASON connection identifier from the IP routing processing device to the second IP backbone router;

an optical transmission module, configured to pass the IP packet through the sending the ASON connection corresponding to the ASON connection identifier to the second IP backbone router, so that the second IP backbone router sends the received IP packet to the second access link connected to the second IP backbone router in the net.

The technical effect of the present invention is: receive the IP grouping sent by the first access network connected with the first IP backbone router through the first IP backbone router, according to the IP destination address in the IP grouping, according to the longest prefix matching principle, Query the local routing information base, if there are multiple routing table entries matching the IP destination address, select a routing table entry from the multiple routing table entries as the optimal routing table entry, and notify the optimal routing table entry The IP backbone router of the optimal routing table item is used as the second IP backbone router; query the local backbone router table, if there is an ASON connection identifier from the first IP backbone router to the second IP backbone router, then according to the ASON connection identifier, the The IP packet is sent to the second IP backbone router, so that the second IP backbone router sends the received IP packet to a second access network connected to the second IP backbone router. Since the IP packet can be directly transmitted from the access network where the source user terminal is located to the access network where the destination user terminal is via an ASON connection, the number of hops in the transmission path of the IP packet is effectively reduced, and the traffic on the IP router is reduced. Photoelectric conversion operation, thereby reducing the delay of IP packet transmission, and reducing the delay jitter caused by IP packet queuing on the intermediate router, thereby solving the problem of Internet instability caused by the use of BGP in the prior art, and effectively improving robustness of the Internet.

Description of drawings

Fig. 1 is the structural representation of the system of the IP network of ASON based on the IP routing processing method of ASON optical network of the present invention;

Fig. 2 is the flowchart of an embodiment of the IP route processing method based on ASON optical network of the present invention;

Fig. 3 is the flow chart of another embodiment of the IP route processing method based on ASON optical network of the present invention;

Fig. 4 is the flow chart of another embodiment of the IP route processing method based on ASON optical network of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of an ASON optical network-based IP routing processing device according to the present invention.

detailed description

Fig. 1 is the structural representation of the system of the IP network of ASON based on the IP routing processing method of ASON optical network of the present invention, as shown in Fig. 1, this system comprises: ASON optical network 11, many IP backbone routers 12, multiple An access network 13 and a plurality of user terminals 14; wherein, the ASON optical network 11 and a plurality of IP backbone routers 12 act as the ASON backbone network of the IP network system. The IP backbone router 12 connects the access network 13 to the ASON optical network 11 . Each access network 13 is connected to the ASON backbone network through at least one IP backbone router 12 , so that user terminals 14 are connected to the ASON optical network 11 through the access network 13 .

At the same time, according to certain network planning, each IP backbone router 12 establishes ASON permanent connection with some other backbone routers 12 on the ASON backbone network. At the same time, the backbone router 12 that has an ASON permanent connection with a certain backbone router 12 is called its fixed neighbor. The establishment of the permanent connection makes all the IP backbone routers connected into a connected network, that is, any backbone router 12 can reach any other backbone router 12 through the path formed by the ASON permanent connection. In addition, the network planning is implemented according to the network scale and optimization objectives, wherein the optimization objectives include management complexity, communication performance, and fault tolerance. The network topology obtained by the network planning may be a star topology, a fully connected topology, and a hierarchical topology.

For the fully connected topology, the IP routing information on one backbone router 12 can be directly distributed to all other backbone routers on the ASON backbone network. In other network topologies other than the fully connected topology, such as star topology or hierarchical topology, it is also necessary to build a broadcast subnet to distribute network routing information (also called IP routing information). The process of selecting some IP backbone routers to act as broadcast forwarding nodes. For example: under the star topology, you can directly select the backbone router at the center as the broadcast forwarding node. For network topologies other than star topology and fully connected topology, multi-point relay (Multi-point Relay) technology or existing Minimal Connected Dominating Set (Minimal Connected Dominating Set) algorithm can be used to select broadcast forwarding nodes.

It should also be noted that each user terminal 14 has at least one IP address, representing its communication address, for example, the IP address is specifically the IPv4 address 202.197.16.10. There is one or more IP address prefixes for each access network 13, representing the IP address range where the user terminal 14 is located in the access network 13, for example: an IPv4 address prefix is 202.197.16.*/24, wherein the prefix length is twenty four.

Fig. 2 is the flow chart of an embodiment of the IP route processing method based on ASON optical network of the present invention, on the basis of the system based on the IP network of ASON shown in above-mentioned Fig. 1, construct a broadcast subnet on this ASON optical network Network, as shown in Figure 2, the method of the present embodiment comprises:

Step 101, the first IP backbone router receives an IP packet sent by a first access network connected to the first IP backbone router.

In this embodiment, the source user terminal in the first access network sends the IP packet to send the IP packet to the first IP backbone router connected to it through the IP router in the first access network.

Step 102, the first IP backbone router queries the local routing information base according to the IP destination address in the IP grouping according to the longest prefix matching principle, if the number of routing table entries matching the IP destination address is multiple, then Select a routing table item from multiple routing table items as the optimal routing table item, and use the IP backbone router that advertises the optimal routing table item as the second IP backbone router.

In this embodiment, each IP backbone router maintains a routing information base, which records routing information of all destination networks. For example, the local routing information database of the first IP backbone router includes: the IP address prefix of the destination network, the ID of the source backbone router notifying the routing information, the routing metric value, and the validity period of the routing, etc. Wherein, the IP address prefix of the destination network includes an IP address and an address mask length.

Step 103, the first IP backbone router queries the local backbone router table, if there is an ASON connection identifier from the first IP backbone router to the second IP backbone router, then according to the ASON connection identifier, the IP group is passed through the ASON connection identifier The corresponding ASON connection is sent to the second IP backbone router, so that the second IP backbone router sends the received IP packet to the second access network connected to the second IP backbone router.

In this embodiment, after receiving the IP packet, the second IP backbone router sends the IP packet to the second access network, and the second access network delivers the IP packet to the destination user according to the traditional access network routing method on the terminal.

In addition, in this embodiment, each IP backbone router in the ASON backbone network is represented by an ID, and the ID may be a 32-bit unsigned integer. In addition, each IP backbone router has an ID in the ASON optical network, which is called the ASON ID. Through the ASON identifier, the corresponding IP backbone router can establish an ASON connection with another IP backbone router, and perform data transmission through this connection.

Each IP backbone router notifies its ID and its ASON identifier to all backbone routers in the ASON backbone network in a broadcast manner, so that each IP backbone router maintains a backbone router table. For example, the local backbone router table maintained by the first IP backbone router includes: the ID of the second IP backbone router, the ASON identifier of the second IP backbone router, and the ASON connection from the first IP backbone router to the second IP backbone router. ID, the lifetime corresponding to the ASON connection ID, etc. Wherein, the ASON connection identifier is information representing a certain connection in the ASON optical network system, through which different ASON connections can be identified. The lifetime corresponding to the ASON connection identifier indicates the valid time of an ASON connection. For an exchange connection, its corresponding lifetime is a 32-bit positive integer, indicating the remaining time that the ASON connection remains valid.

In this embodiment, the IP packet sent by the first access network connected to the first IP backbone router is received by the first IP backbone router, and according to the IP destination address in the IP packet, according to the longest prefix matching principle, query Local routing information base. If the number of routing table entries matching the IP destination address is multiple, select a routing table entry from the multiple routing table entries as the optimal routing table entry, and advertise the IP address of the optimal routing table entry The backbone router is used as the second IP backbone router; query the local backbone router table, if there is an ASON connection identifier from the first IP backbone router to the second IP backbone router, then according to the ASON connection identifier, send the IP grouping to the second IP backbone router an IP backbone router, so that the second IP backbone router sends the received IP packet to a second access network connected to the second IP backbone router. Since the IP packet can be directly transmitted from the access network where the source user terminal is located to the access network where the destination user terminal is via an ASON connection, the number of hops in the transmission path of the IP packet is effectively reduced, and the traffic on the IP router is reduced. Photoelectric conversion operation, thereby reducing the delay of IP packet transmission, and reducing the delay jitter caused by IP packet queuing on the intermediate router, thereby solving the problem of Internet instability caused by the use of BGP in the prior art, and effectively improving robustness of the Internet.

Fig. 3 is the flow chart of another embodiment of the IP routing processing method based on ASON optical network of the present invention, on the basis of the system based on the IP network of ASON shown in above Fig. 1, as shown in Fig. 3, this implementation Example methods include:

Step 201. The first IP backbone router receives an IP packet sent by a first access network connected to the first IP backbone router.

In this embodiment, the source user terminal in the first access network sends the IP packet to send the IP packet to the first IP backbone router connected to it through the IP router in the first access network.

Step 202, the first IP backbone router queries the local routing information base according to the IP destination address in the IP group according to the longest prefix matching principle, if the number of routing table entries matching the IP destination address is multiple, then Select a routing table item from multiple routing table items as the optimal routing table item, and use the IP backbone router that advertises the optimal routing table item as the second IP backbone router.

In this embodiment, when the first backbone router queries its routing table according to the longest prefix matching principle, it uses the IP destination address to match the IP address prefix in the routing table entry. There may be multiple routing table entries that match the IP destination address, and each routing table entry may be advertised by a different backbone router, so one of them needs to be selected as the optimal route. Among them, the IP backbone that advertises the optimal route The router is the IP backbone router selected as the next hop, that is, the second IP backbone router.

It should also be noted that, if there is only one routing table entry matching the IP destination address, the IP backbone router that advertises the matching routing table entry is taken as the second IP backbone router.

In this embodiment, when there are at least two routing table entries matching the IP destination address, one routing table entry is selected from multiple routing table entries as the optimal routing table entry, and the optimal route is advertised The IP backbone router of the table entry is used as the second IP backbone router, and the specific implementation method is as follows:

If the number of routing table entries matching the IP destination address is multiple, then according to the IP address prefix and routing metric value in each routing table entry matching the IP destination address, from the multiple routing table entries Select a routing entry as the optimal routing table entry, and advertise the IP backbone router of the routing table entry as the second IP backbone router

In this embodiment, specifically, the route is first selected according to the longest prefix length matching principle, and then the route is selected according to the magnitude of the route metric value. For example, assuming that the IP destination address in the IP packet is IPv4 address 202.197.16.99, the routing information containing this address in the local routing information base of the first IP backbone router (assumed to be IP backbone router A) is: (202.197.16 .*/22, IP backbone router B, 10, 1000), (202.197.16.*/24, IP backbone router C, 10, 1020) and (202.197.16.*/24, IP backbone router D, 8, 1600). Since the address prefix length in the first route is 22, choose the best route from the last two routes. Since the route metric value of the third route is 8, which is smaller than the route metric value of the second route, the third route is selected as the best route, that is, the IP backbone router D is used as the second IP backbone router.

Step 203, the first IP backbone router queries the local backbone router table, and judges whether there is an ASON connection identifier from the first IP backbone router to the second IP backbone router; if it exists, then execute step 204; if not, then execute step 205.

Step 204: According to the ASON connection identifier, the first IP backbone router sends the IP packet to the second IP backbone router through the ASON connection corresponding to the ASON connection identifier, so that the second IP backbone router will receive the IP The packet is sent to the second access network connected to the second IP backbone router. End.

Step 205, the first IP backbone router establishes an ASON switching connection between the first IP backbone router and the second IP backbone router, and updates the local backbone router table.

Step 206, the first IP backbone router sends the IP packet to the second IP backbone router through the ASON connection according to the ASON connection identifier, so that the second IP backbone router sends the received IP packet to the In the second access network connected to the second IP backbone router. End.

In this embodiment, it should be noted that if there is no ASON connection identifier from the first IP backbone router to the second IP backbone router, the IP packet can be stored in the IP packet cache, and the IP packet of the destination network The ASON identifier of the backbone router establishes an ASON switching connection from the first IP backbone router to the second IP backbone router. Before the ASON switching connection is successfully established, all IP packets from the first IP backbone router to the second IP backbone router can be stored in the IP packet cache and queued. When the ASON switching connection is successfully established, the IP packet stored in the IP packet cache is sent to the second IP backbone router.

Fig. 4 is the flow chart of another embodiment of the IP routing processing method based on the ASON optical network of the present invention, on the basis of the above-mentioned embodiment shown in Fig. 2 or Fig. 3, as shown in Fig. 4, the method of this embodiment includes : Before step 101 or step 201, the method may further include:

Step 301, the first IP backbone router receives the routing information of the first destination network sent by the first access network, and the routing information of the first destination network includes: an IP address prefix and a routing metric value of the first destination network.

Step 302, the first IP backbone router saves the routing information of the first destination network in the local routing information base.

Step 303, the first IP backbone router carries the ID of the first IP backbone router in the routing information of the first destination network, and broadcasts the first destination network carrying the ID of the first IP backbone router through the broadcast subnet The routing information is sent to other IP backbone routers in the ASON backbone network except the first IP backbone router.

In this embodiment, after the IP backbone router is running, it will exchange routing information with other routers in the access network, so as to obtain the routing information of the destination network in the access network. The routing information of each destination network includes the IP address prefix and routing metric value of the destination network. The IP address prefix in an IPv4 network is a 32-bit unsigned integer and the corresponding address mask length. The IP address prefix in the IPv6 network is a 128-bit unsigned integer and the corresponding address mask length. The routing metric is a 32-bit integer value, reflecting the "distance" or path capacity or routing preference from the IP backbone router to the destination network. After the IP backbone router obtains the routing information of a certain destination network from the access network, after carrying the ID of the IP backbone router in the routing information of the destination network, it notifies all the backbone routers in the ASON backbone network through the broadcast subnet .

In addition, when the IP backbone router discovers that the routing metric value of a destination network in the access network has changed, the IP backbone router notifies the new routing metric value to other backbone routers in the ASON backbone network; When a certain destination network in the network is unreachable, the IP backbone router notifies other backbone routers in the ASON backbone network of a route withdrawal message. You can withdraw the route to a certain destination network by setting the route metric value to -1.

In order to avoid route flapping, the time interval between two consecutive announcements of routing information to the same destination network by the IP backbone router should not be less than a minimum route update time interval value, which can be configured by the administrator, and the default value is 1 second. When an IP backbone router receives a new routing information from another IP backbone router, in addition to updating its routing information database, it can also distribute this routing information to the access network connected to it in the form of external routing.

Optionally, the method may also include:

The first IP backbone router receives the routing information of the second destination network sent by the third IP backbone router, and the routing information of the second destination network includes: the ID of the third IP backbone router, the IP address prefix and the routing metric of the second destination network value;

The first IP backbone router saves the received routing information of the second destination network in the local routing information base.

In this embodiment, since the IP routing information distribution path is separated from the IP packet forwarding path, the complex process of the existing inter-domain routing protocol is abandoned, and the fast exchange of inter-domain IP routing information is realized. The efficiency of IP routing information exchange also avoids the problems of stability and convergence existing in the existing BGP. In addition, by binding the IP address prefix to the backbone router that notifies the routing information of the address prefix, it is convenient to authenticate the backbone router that notifies the routing information, thereby improving the security of inter-domain routing information exchange, and is conducive to solving Routing security issues such as IP address prefix hijacking.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Fig. 5 is the structure schematic diagram of an embodiment of the IP route processing device based on ASON optical network of the present invention, as shown in Fig. 5, constructs a broadcast subnet on this ASON optical network, the IP route processing device of the present embodiment can specifically It is an IP backbone router, and the device includes: an access network routing module 21, a backbone network routing module 22, and an optical transmission module 23; wherein, the access network routing module 21 is used to receive the first access network connected to the IP routing processing device. The IP grouping that sends; The backbone network routing module 22 is used for according to the IP destination address in this IP grouping, according to the longest prefix matching principle, inquires about the local routing information storehouse, if the quantity of the routing table item matching with this IP destination address is more item, then select a routing table item as the optimal routing table item from a plurality of routing table items, and use the IP backbone router of the optimal routing table item as the second IP backbone router; the backbone network routing module 22 also It is used to query the local backbone router table to determine whether there is an ASON connection identifier from the IP routing processing device to the second IP backbone router; The ASON connection identification of the second IP backbone router, then according to the ASON connection identification, send the IP packet to the second IP backbone router through the ASON connection corresponding to the ASON connection identification, so that the second IP backbone router will receive The IP packet is sent to the second access network connected to the second IP backbone router.

The device for processing routing in this embodiment can execute the embodiment of the method shown in FIG. 2 , and its implementation principles are similar, so details are not repeated here.

In this embodiment, the routing processing device receives the IP packet sent by the first access network connected to the routing processing device, and queries the local routing according to the IP destination address in the IP packet and according to the longest prefix matching principle information base, if the number of routing table entries matching the IP destination address is multiple, select a routing table entry from the multiple routing table entries as the optimal routing table entry, and notify the optimal routing table entry The IP backbone router of the item is used as the second IP backbone router; query the local backbone router table to determine whether there is an ASON connection identifier from the IP routing processing device to the second IP backbone router, if there is an ASON connection identifier from the routing processing device to the second IP The ASON connection identifier of the backbone router, according to the ASON connection identifier, the IP packet is sent to the second IP backbone router through the ASON connection corresponding to the ASON connection identifier, so that the second IP backbone router will receive the IP The packet is sent to the second access network connected to the second IP backbone router, since the IP packet can be directly transmitted from the access network where the source user terminal is located to the access network where the destination user terminal is via an ASON connection, therefore It effectively reduces the number of hops in the IP packet transmission path and reduces the photoelectric conversion operation on the IP router, thereby reducing the transmission delay of the IP packet and reducing the delay jitter caused by the queuing of the IP packet on the intermediate router, thereby solving the problem of The problem of Internet instability caused by the adoption of BGP in the prior art is solved, and the robustness of the Internet is effectively improved.

Further, in another embodiment of the present invention, on the basis of the above-mentioned embodiment shown in FIG. 5 , the backbone routing module 22 is also configured to, if it is judged that the ASON connection identifier does not exist, then between the IP routing processing device and An ASON switching connection is established between the second IP backbone routers, and the local backbone router table is updated.

Optionally, when the routing table entry includes: the ID of the IP backbone router announcing the routing table entry, the corresponding IP address prefix and the routing metric value, the backbone routing module 22 is specifically used to query the local routing information base, according to The longest prefix matching principle obtains the routing table entries that match the IP destination address. If the number of routing table entries matching the IP destination address is multiple, then according to the IP address prefix and routing metric value in each routing table entry matching the IP destination address, from the multiple routing table entries A routing item is selected as the optimal routing table item, and the IP backbone router advertising the routing table item is used as the second IP backbone router.

Furthermore, in yet another embodiment of the present invention, on the basis of the above-mentioned embodiment shown in FIG. 5 , the access network routing module 21 is also configured to receive the information of the first destination network sent by the first access network. Routing information, the routing information of the first destination network includes: the IP address prefix and routing metric value of the first destination network;

The backbone routing module 22 is also configured to store the routing information of the first destination network in the local routing information base;

The optical transmission module 23 is also used to carry the ID of the routing processing device in the routing information of the first destination network, so as to obtain the routing information of the second destination network, and broadcast the processing device carrying the routing information through the broadcast subnet The routing information of the first destination network with ID is sent to other IP backbone routers in the ASON backbone network except the IP routing processing device.

Optionally, the optical transmission module 23 is also configured to receive the routing information of the second destination network sent by the third IP backbone router. The routing information of the second destination network includes: the ID of the third IP backbone router, the second destination network IP address prefixes and route metrics;

The backbone routing module 22 is also configured to save the received routing information of the second destination network in the local routing information base.

In this embodiment, the access network routing module 21 implements the same intra-domain routing protocol as that of the access network, for example, the OSPF protocol. The backbone network routing module 22 implements the routing protocol of the backbone network (equivalent to an inter-domain routing protocol), and exchanges routing information with other backbone routers through this protocol. At the same time, routing information is exchanged through the access network routing module 21, the backbone network routing module 22 and other routers in the access network, so as to obtain the routing information inside the access network (that is, the routing information of the above-mentioned destination network).

Optionally, an existing intra-domain routing protocol is allowed to be used in the access network to establish routes, for example, the OSPF protocol. In this case, the access network routing module may specifically be an OSPF routing protocol module. When a link is interrupted or a new link is added in the access network, the link state change information can be propagated to all OSPF routing protocol modules in the access network through the OSPF protocol, and the OSPF routing protocol module State change information, calculate and obtain corresponding routing information, and make the access network routing module 21 propagate the changed routing information to the backbone network routing module 22 in a route redistribution manner. It should be noted that the change of the link state leads to the change of the network path, therefore, it leads to the change of the route metric value from the backbone router to a certain destination network.

The present invention also provides a routing processing system, including: ASON backbone network and access network, the ASON backbone network includes: ASON optical network system and IP backbone router, wherein, the IP backbone router is the above-mentioned IP routing processing device, and can execute the processing method of any one of the routes shown in FIG. 2 to FIG.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (8)

1. a kind of IP route processing method based on ASON optical network, it is characterized in that, build a broadcast subnet on described ASON optical network, then described method comprises: The first IP backbone router receives the IP packet sent by the first access network connected to the first IP backbone router; The first IP backbone router queries the local routing information base according to the IP destination address in the IP group according to the longest prefix matching principle, and if the number of routing table entries matching the IP destination address is multiple, Then select a routing table item as the optimal routing table item from a plurality of routing table items, and use the IP backbone router of the optimal routing table item as the second IP backbone router; The first IP backbone router queries the local backbone router table, and if there is an ASON connection identifier from the first IP backbone router to the second IP backbone router, according to the ASON connection identifier, the IP packet is passed through the The ASON connection corresponding to the ASON connection identifier is sent to the second IP backbone router, so that the second IP backbone router sends the received IP packet to the second interface connected to the second IP backbone router In network access; if there is no ASON connection identifier from the first IP backbone router to the second IP backbone router, then the first IP backbone router is between the first IP backbone router and the second IP backbone router establish an ASON exchange connection between them, and update the local backbone router table, the first IP backbone router sends the IP packet to the second IP backbone router through the ASON connection according to the ASON connection identifier, so that the second IP The backbone router sends the received IP packet to the second access network connected to the second IP backbone router. 2. The method according to claim 1, wherein the routing table item comprises: the ID of the IP backbone router announcing the routing table item, the corresponding IP address prefix and the routing metric value; When the number of routing table entries matching the destination address is multiple, select one of the multiple routing table entries according to the IP address prefix and routing metric value in each routing table entry matching the IP destination address The routing item is used as the optimal routing table item, and the IP backbone router advertising the routing table item is used as the second IP backbone router. 3. The method according to claim 1, further comprising: The first IP backbone router receives routing information of the first destination network sent by the first access network, where the routing information of the first destination network includes: an IP address prefix and a routing metric value of the first destination network; The first IP backbone router saves the routing information of the first destination network in the local routing information base; The first IP backbone router carries the ID of the first IP backbone router in the routing information of the first destination network, and broadcasts the first IP backbone router carrying the ID of the first IP backbone router through a broadcast subnet. The routing information of the destination network is sent to other IP backbone routers in the ASON backbone network except the first IP backbone router. 4. The method according to claim 3, further comprising: The first IP backbone router receives the routing information of the second destination network sent by the third IP backbone router, and the routing information of the second destination network includes: the ID of the third IP backbone router, the IP address prefix of the second destination network and routing metrics; The first IP backbone router saves the received routing information of the second destination network in the local routing information base. 5. a kind of IP route processing device based on ASON optical network, it is characterized in that, build a broadcast subnet on described ASON optical network, then this device comprises: An access network routing module, configured to receive IP packets sent by the first access network connected to the IP routing processing device; The backbone network routing module is used to query the local routing information base according to the IP destination address in the IP packet according to the longest prefix matching principle. If the number of routing table entries matched with the IP destination address is multiple, Then select a routing table item as the optimal routing table item from a plurality of routing table items, and use the IP backbone router of the optimal routing table item as the second IP backbone router; The backbone routing module is also used to query the local backbone router table to determine whether there is an ASON connection identifier from the IP routing processing device to the second IP backbone router; an optical transmission module, configured to pass the IP packet through the sending the ASON connection corresponding to the ASON connection identifier to the second IP backbone router, so that the second IP backbone router sends the received IP packet to the second access link connected to the second IP backbone router in the net; The backbone routing module is further configured to establish an ASON switching connection between the IP routing processing device and the second IP backbone router if there is no ASON connection identifier, and update the local backbone router table. 6. The device according to claim 5, wherein the routing table item comprises: an ID of an IP backbone router advertising the routing table item, a corresponding IP address prefix and a routing metric value; The module is used to query the local routing information base, and obtain the routing table entry matching the IP destination address according to the longest prefix matching principle; if the number of routing table entries matching the IP destination address is multiple, then according to each The IP address prefix and the routing metric value in the routing table entry matching the IP destination address, select a routing entry as the optimal routing table entry from the multiple routing table entries, and notify the routing table entry of the routing table entry An IP backbone router serves as the second IP backbone router. 7. The device according to claim 5, wherein the access network routing module is further configured to receive the routing information of the first destination network sent by the first access network, and the routing information of the first destination network The routing information includes: the IP address prefix and the routing metric value of the first destination network; The backbone routing module is further configured to save the routing information of the first destination network in the local routing information base; The optical transmission module is also used to carry the ID of the IP routing processing device in the routing information of the first destination network, and send the ID of the processing device carrying the routing information to the first destination through the broadcast subnet. The routing information of the network is sent to other IP backbone routers in the ASON backbone network except the IP routing processing device. 8. The device according to claim 7, wherein the optical transmission module is further configured to receive the routing information of the second destination network sent by the third IP backbone router, the routing information of the second destination network comprising: The ID of the third IP backbone router, the IP address prefix and routing metric value of the second destination network; The backbone routing module is further configured to save the received routing information of the second destination network in the local routing information base.