WO2011022991A1

WO2011022991A1 - Control network element and routing control method thereof

Info

Publication number: WO2011022991A1
Application number: PCT/CN2010/072636
Authority: WO
Inventors: 杨波; 宋晓丽
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-08-31
Filing date: 2010-05-11
Publication date: 2011-03-03
Also published as: CN101997752B; CN101997752A

Abstract

A control network element is provided by the present invention. The control network element is used for the Internet Protocol (IP) network with separated control and forwarding, including: a routing determining module, used to select final routing information based on the routing protocol message reported by a forwarding network element and the static routing information passed down by a management network element; a passing down module, used to pass the final routing information down to the forwarding network element. A routing control method for the control network element is also provided by the present invention. Use of the technical solution in the present invention rationally implements a routing processing flow, and enables the control network element to be equipment in a simple and feasible way.

Description

Control network element and routing control method thereof

The present invention relates to the field of IP (Internet Protocol) network technology, and in particular, to a control network element and a routing control method thereof. Background technique

With the rapid development of Internet technology, IP networks have been widely commercialized on a large scale, and the scale and number of users of commercial networks are continuing to develop rapidly.

As more and more new services and new functions are introduced into the network, the control plane of the IP network becomes more and more complex, and the scalability of the control plane, data plane, and management plane becomes the main obstacle in the evolution of the IP network. problem.

The shortcomings of current IP network architecture design have greatly limited network capacity, network scalability, controllability, security, and QoS (Quality of Service). In the current IP network, the control plane and the data plane are integrated on the same network node. Therefore, when more and more services and control signaling are added to the network node, the whole network is extremely complicated and difficult to maintain, and it is difficult to expand.

In order to cope with the above network problems, the industry has proposed the concept of control forwarding separation. The control planes are separated from the data plane and maintained separately, thereby reducing the pressure on network expansion and control capabilities and increasing the robustness of the network.

FIG. 1 is a schematic structural diagram of an IP network for controlling forwarding and separation based on an iSCP (Independent Scalable Control Plane) technology. As shown in Figure 1, the network is a network in which the control plane is separated from the data plane. The control plane is composed of a CE (Control Element) and an SCE (Service Control Element). It is mainly used for control and management. The operation of all the network protocols; the data plane is composed of a forwarding element (FE) and a service forwarding element (SFE). It is mainly used to complete the forwarding of business data.

In addition, a management network element (ME) is used to manage network entities such as CEs and FEs. The ME monitors and collects static information and status information of each network element, and uses the information and configuration commands to The network element is managed.

However, the prior art has at least the following disadvantages:

The prior art only proposes an architecture of an IP network that controls the forwarding and separation based on the iSCP technology, but does not provide an achievable solution for how the control network element is implemented. Summary of the invention

The object of the present invention is to provide a control network element and a route control method thereof, which implements route control processing in an IP network that controls forwarding and separation.

In order to achieve the above object, the present invention provides a control network element for controlling a separate Internet Protocol IP network, including:

The route determining module is configured to select the final routing information based on the routing protocol message reported by the forwarding network element and the static routing information sent by the management network element;

And a sending module, configured to send the final routing information to the forwarding network element.

In the foregoing control network element, the route determining module specifically includes:

An information collecting module, configured to receive a routing protocol packet reported by the forwarding network element, and a route calculation module, configured to acquire a network extension of the data plane according to the routing protocol corresponding to the routing protocol packet and the routing protocol packet Pu, and obtaining routing information corresponding to the next hop of the different destination address according to the network topology;

The routing module is configured to select the final routing information from the routing information and the static routing information sent by the ME by using a preset policy.

The control network element, where the preset policy is a priority-based policy.

The control network element, where the route in the final routing information has a minimum routing cost. The foregoing control network element further includes a saving module, configured to save the final routing information. The embodiment of the invention further provides a routing control method for controlling a network element, which is used for controlling a separate Internet Protocol IP network, including:

The control network element selects the final routing information based on the routing protocol packet and the static routing information reported by the forwarding network element;

The control network element sends the final routing information to the forwarding network element; the forwarding network element forwards the data packet.

In the above method, the control network element selects the final routing information based on the routing protocol packet and the static routing information reported by the forwarding network element, and specifically includes:

Receiving, by the control network element, a routing protocol packet reported by the forwarding network element;

Obtaining, by the control network element, a network topology of the data plane according to the routing protocol corresponding to the routing protocol packet and the routing protocol packet;

The control network element acquires routing information of a next hop corresponding to different destination addresses according to the network topology;

The control network element selects the final routing information from the routing information and the static routing information sent by the ME by using a preset policy.

In the above method, the preset policy is a priority-based policy.

In the above method, the route in the final routing information has a minimum routing cost.

The above method further includes: controlling the network element to save the final routing information.

The embodiments of the present invention have the following beneficial effects:

In the embodiment of the present invention, the control network element selects the final routing information based on the routing protocol packet and the static routing information reported by the forwarding network element, and after determining the final routing information, sends the final routing information to the forwarding network element, where the forwarding is performed. The network element performs data packet forwarding, which can reasonably implement the routing processing process, and implements the deviceization of the control network element in a feasible manner. DRAWINGS

FIG. 1 is a schematic structural diagram of an IP network for controlling forwarding and separating based on iSCP technology; FIG. 2 is a schematic structural diagram of a control network element according to the present invention;

FIG. 3 is a schematic flowchart of a method for implementing a route control of a control network element according to the present invention. detailed description

The basic idea of the present invention is: the route determining module selects the final routing information based on the routing protocol message reported by the forwarding network element and the static routing information sent by the management network element; the sending module sends the final routing information to the forwarding Network element.

The present invention provides a control network element. FIG. 2 is a schematic structural diagram of a control network element in the present invention. As shown in FIG. 2, the control network element includes:

The routing determining module 21 is configured to select the final routing information based on the routing protocol packet and the static routing information reported by the FE.

The sending module 22 is configured to send the final routing information to the FE; and the FE performs data packet forwarding.

The routing information determining module is as shown in FIG. 2, and specifically includes:

The information collection module 211 is configured to receive a routing protocol packet reported by the FE.

The FE supports one or more routing protocols. When it is activated, it uses the mechanism specified by the corresponding routing protocol to discover the neighbor nodes connected to it (for example, the OSPF protocol uses the "hello" message). Then, the link state information is exchanged by using a routing protocol message such as link state broadcast information.

Based on the above mechanism, when receiving a routing protocol packet, the FE will be separated from the data packet and sent to the information collection module of the CE to which the FE belongs.

The route calculation module 212 is configured to obtain a network topology of the data plane according to the routing protocol corresponding to the routing protocol packet and the routing protocol packet, and obtain the next corresponding to the different destination address according to the network topology. Jump routing information; Because the routing protocol packets reported by the FE include information such as the link status of the FE, the CE can calculate the network topology of the data plane according to the routing protocol corresponding to the routing protocol packet.

The routing module 213 is configured to select the final routing information from the routing information and the static routing information sent by the ME by using a preset policy.

For the foregoing routing module, the routing policy needs to use the preset policy to select the final routing information, and the policy may be a priority-based policy. For example, the static routing information delivered by the ME may be configured to have the highest priority, or may be based on the routing cost. Configure the priority and the routing information with the lowest routing cost as the final routing information.

The control network element in the embodiment of the present invention may further include:

The saving module 23 is configured to save the final routing information selected by the routing calculation module 213 for querying and modifying.

The present invention also provides a routing control method for controlling a network element. FIG. 3 is a schematic flowchart of a method for implementing a routing control of a control network element according to the present invention. As shown in FIG. 3, the method includes the following steps: Step 31: Controlling network element reception Routing protocol packets reported by the FE;

Step 32: The control network element acquires a network topology of the data plane according to the routing protocol corresponding to the routing protocol and the routing protocol packet.

Step 33: The control network element acquires routing information of a next hop corresponding to different destination addresses according to the network topology.

Step 34: The control network element selects the final routing information from the routing information and the static routing information sent by the ME by using a preset policy.

Step 35: The control network element sends the final routing information to the FE, and uses the FE to forward the data.

Of course, after the control network element selects the final routing information, the final routing information is saved, which facilitates operations such as querying and modifying.

The routing protocol mentioned in the foregoing apparatus and method may be RIB (Routing) Information Protocol, Routing Information Protocol, OSPF (Open Shortest Path First) protocol, IGRP (Interior Gateway Routing Protocol), BGP (Border Gateway Protocol), and other protocols .

The following is an example of the OSFP protocol as follows.

For the OSFP protocol, the routing protocol packet includes a Hello packet and a link state broadcast packet.

An FE sends a Hello packet to the neighboring FE. If a Hello packet is received from a FE, the two FEs form a neighbor relationship.

When the FE is initialized or the network structure changes (for example, the FE is increased or decreased, the link status changes, etc.), the FE generates a Link-State Advertisement (LSA), which contains all the connections on the router. Link, that is, status information of all ports;

All FEs exchange link state data through a method called flooding. Flooding means that the FE transmits its LSA data packet to all its neighboring FEs. The neighboring FE updates its own database according to the link state information it receives, and forwards the link state information to its neighboring router. , until a process of stability.

When receiving a Hello packet or an LSA, the FE analyzes the packet and reports it to the corresponding CE.

The information collection module of the CE receives the Hello message or the LSA reported by the FE, and then the routing calculation module establishes the adjacency relationship between all FEs in the data plane by using the OSPF protocol, thereby obtaining the network topology, and the route calculation module can receive the After updating the network topology, the LSA obtains the updated network topology, and then the routing calculation module calculates a routing table of the FE according to the network topology, where the routing table includes the cost of the FE to each reachable FE and the arrival. The next FE (next-hop) to be forwarded by the FE, which can calculate a shortest path tree for each FE with the FE as the root, and then generate an OSPF routing table corresponding to the FE according to the shortest path tree. According to the OSPF routing table, in the process of forwarding the data packet, the FE searches the OSPF routing table according to the destination of the data packet, and can know the next FE to be forwarded to the destination, and then the packet is further forwarded. Forward to the next FE.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Claim

A control network element, configured to control a separate Internet Protocol IP network; wherein the control network element comprises:

And a sending module, configured to send the selected final routing information to the forwarding network element.

The control network element according to claim 1, wherein the route determining module specifically includes:

And a routing module, configured to select, by using a preset policy, final routing information from the routing information and the static routing information.

The control network element according to claim 1 or 2, wherein the preset policy is a priority-based policy.

4. The control network element of claim 3, wherein the route in the final routing information has a minimum routing cost.

The control network element according to claim 1 or 2, wherein the control network element further comprises: a saving module, configured to save the final routing information.

6. A routing control method for controlling a network element, configured to control a separate Internet Protocol IP network; and the method includes:

The control network element selects the final routing information based on the routing protocol message reported by the forwarding network element and the static routing information sent by the management network element;

The control network element sends the selected final routing information to the forwarding network element, where the Send a network element to forward data packets.

The routing control method according to claim 6, wherein the controlling the network element to select the final routing information based on the routing protocol packet and the static routing information includes:

The control network element selects the final routing information from the routing information and the static routing information sent by the management network element by using a preset policy.

The routing control method according to claim 6 or 7, wherein the preset policy is a priority-based policy.

9. The routing control method according to claim 8, wherein the route in the final routing information has a minimum routing cost.

The routing control method according to claim 6 or 7, wherein the method further comprises: the controlling network element saving the final routing information.