WO2011113398A1

WO2011113398A1 - Method and node for constructing management and maintenance channels

Info

Publication number: WO2011113398A1
Application number: PCT/CN2011/073484
Authority: WO
Inventors: 张雪江
Original assignee: 华为技术有限公司
Priority date: 2011-04-28
Filing date: 2011-04-28
Publication date: 2011-09-22
Also published as: CN102171974A; CN102171974B

Abstract

Relating to the field of communication technology, a method and a node for constructing management and maintenance channels are provided. The embodiments of the present invention include: first, each node in a network obtains the topology information of the network by applying an extended designated protocol; then, according to the obtained topology information of the network, each node in the network determines the broadcast tree from edge nodes to each node via a predetermined algorithm and configures the ports of the broadcast tree dynamically, wherein the broadcast tree is used to transmitting management and maintenance messages. The embodiments of the present invention enable, for a two-layer network with any kind of topology, each node in the network to construct management and maintenance channels automatically without manual configuration so that the plug and play capabilities of devices are enabled. In addition, the embodiments of the present invention perform port insulation at each output port of the broadcast tree in management Virtual Local Area Network (mVLAN) so that the management and maintenance massages can be only transmitted between the output ports and the input ports of the broadcast tree, therefore ensuring network device operation safety and reliability.

Description

Construction method and node of management and maintenance channel

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and a node for constructing a maintenance and maintenance channel.

Background of the invention

To manage and maintain devices and networks through the network management system in the background, you need to establish a channel between the Layer 3 device and the Layer 2 network device to forward management and maintenance packets from the NMS. The process implemented in the prior art is: First, the NNI at each node (network node interface, Network Manually configure mVLAN on the side port of the Node Interface (virtual management area network, management virtual Local Area) Then, on the edge Layer 3 device, configure the mVLAN as the gateway interface of all Layer 2 network devices and configure interface routing. All nodes in the Layer 2 network are manually configured with MSTP (Multiple). Spanning Tree Protocol, multiple spanning tree protocol, based on the protocol, the loop existing in the mVLAN broadcast domain is destroyed. Finally, a channel between the edge Layer 3 device and the Layer 2 device is established from the edge node to each node. The channel is used to transmit between the network management system of the background or other service systems (including a dynamic host configuration protocol server that allocates addresses for the Layer 2 device or a file transmission server that provides version downloading for the device) and each Layer 2 network device. Network management or other service packets.

Summary of the invention

The embodiment of the present invention provides a method for constructing a maintenance and maintenance channel and a node. The node in the network can automatically determine the broadcast tree and propagate the maintenance and maintenance message through the broadcast tree.

An embodiment of the present invention provides a method for constructing a management and maintenance channel, including:

The extended specific protocol is used to obtain topology information in the network, where the topology information includes: a node state in the network, a link state between nodes, management virtual network mVLAN information, and edge node information;

Determining, by the predetermined algorithm, a broadcast tree to the edge node according to the node state, the inter-node link state, and the edge node information in the acquired network, and dynamically configuring a port of the broadcast tree according to the mVLAN information, the broadcast The tree is used to propagate management and maintenance messages.

The embodiment of the invention provides a node, including:

An acquiring module, configured to acquire topology information in the network by running the extended specific protocol, where the topology information includes: a node state of each node in the network, a link state between nodes, management virtual network mVLAN information, and edge node information;

a broadcast tree determining module, configured to determine, according to a node state, an inter-node link state, and an edge node information in a network acquired by the acquiring module, a broadcast tree to an edge node by using a predetermined algorithm, and dynamically configuring the device according to the mVLAN information The port of the broadcast tree, where the broadcast tree is used to propagate management maintenance messages.

It can be seen from the technical solution provided by the foregoing embodiments of the present invention that each node in the network acquires topology information in the network by running a specific protocol extended, and determines a broadcast tree in the network according to the predetermined algorithm according to the topology information, without manual Configure to enable each node in the network of any topology to automatically build management and maintenance channels.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flowchart of a method for constructing a management maintenance channel according to an embodiment of the present invention;

2 is a schematic diagram of an extended format of a TLV message according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a layer 2 network formed by 10 nodes according to an embodiment of the present disclosure;

4 is a schematic structural diagram of a Layer 2 network formed by 11 nodes according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a node according to an embodiment of the present invention.

Mode for carrying out the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

An embodiment of the present invention provides a method for constructing a management and maintenance channel, as shown in FIG. 1 , including:

11. The nodes in the network obtain the topology information in the network by running the extended specific protocol, where the topology information in the network includes but is not limited to the node status of each node in the network, the link state between nodes, and the management virtual network mVLAN information and Edge node information.

Further, the specific protocol may be the 802.1aq protocol, and the 802.1aq protocol is the ITU (International Telecommunications Union, the International Telecommunications Union, a standard protocol, because the node status and inter-node link status of each node in the network can be learned by running the existing 802.1aq protocol, so the extension of 802.1aq only needs to include mVLAN information and The edge node information may be, wherein the node state may indicate that each node is in a working or closed state, and the inter-node link state may indicate that the link between the nodes is in a normal or fault state. The extension of the 802.1aq can be extended to the TLV packet in the protocol. The extended format can be as shown in Figure 2, where "Type" is used to identify the topology information of the packet used in the transmission network; "Length" is used to Identifies the length of the packet; "mVLAN" Used to mark the mVLAN information reserved by the network. The mVLAN information can be used to identify the mVLAN; ID is used to identify the information of the edge node, which can be the MAC address of the edge node. The nodes in the network can extend the entire network of the topology information by running the extended 802.1aq protocol, so that all nodes on the entire network can perceive the network. The edge node in the mVLAN is a network reserved for the edge node and configured on the edge node to carry packets for communication with the service system and for managing network devices in the maintenance network.

12. Each node in the network determines a broadcast tree of the edge node to each node in the network according to a node state, an inter-node link state, and an edge node information in the acquired network, and dynamically configures the broadcast according to the mVLAN information. A port of the tree, where the broadcast tree is used to propagate management and maintenance messages.

Specifically, the foregoing broadcast tree is automatically saved in each node after determining, and the predetermined algorithm may include, but is not limited to, a shortest path first SPF algorithm, and the node automatically adopts an SPF algorithm based on the edge node information according to the node status of each node and the interlink relationship between the nodes. The broadcast tree with the edge node as the root and the other nodes as the leaf nodes is constructed. Take the two-layer network composed of 10 nodes as shown in FIG. 3 as an example, and the dotted line indicates the broadcast path of the automatically constructed broadcast tree.

Since the broadcast tree automatically constructed is only used when the service system such as the background network management manages and maintains the network device, no communication is required between the nodes, so in order to prevent a node from transmitting ARP (Address Resolution Protocol), DHCP (Dynamic Host Configuration) Protocols, dynamic host setting protocol, etc. are broadcasted to other nodes in a meaningless manner, and the load of the control planes of other nodes is increased. Therefore, port isolation of each outgoing port of the broadcast tree is performed on the mVLAN. To prevent the packets from being forwarded on the mVLANs in the outbound port of the broadcast tree, you can maintain the outbound port list of the broadcast tree first, and then set all the outbound ports in the outbound port list to port isolation. The settings can be done by each node or by a switch in the network. The port isolation setting allows packets to be forwarded only between the ingress port and the egress port of the broadcast tree. In this way, each node can send and receive management and maintenance packets only between the service system and the back-end network. The nodes do not send and receive packets to each other, ensuring the security and reliability of the network device.

Specifically, a two-layer network composed of 10 nodes as shown in FIG. 3 is taken as an example, wherein Ifi-j represents a port between node i and node j, and i and j are both positive integers, and the ingress port of node 2 For example, if2-1, the outbound ports If2-3 and If2-5, the ports If2-3 and If2-5 are set to port isolation, so that packets can only be forwarded between If2-3 and If2-1, or Messages can only be forwarded between If2-5 and If2-1.

Further, when a node in the broadcast tree fails, the node adjacent to the faulty node broadcasts fault information, and the nodes other than the faulty node in the broadcast tree pass the predetermined fault information according to the fault information and the topology information in the network. The algorithm re-determines the broadcast tree of the edge node to each node in the network and updates the stored broadcast tree; for example, as shown in FIG. 3, if node 7 fails, node 1 and/or node 8 adjacent to node 7 broadcast node 7 For the fault information, nodes 1, 2, 3, 4, 5, 6, 8, 9, and 10 in the broadcast tree re-determine the broadcast tree of the edge node 1 to each node in the network through the SPF algorithm, and update the original stored node according to the node. 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 use the SPF algorithm to determine the broadcast tree between the edge node 1 and each node, and manage the maintenance message transmission through the updated broadcast tree. .

The method further includes: when a link fault occurs between the node and the node in the network, the node connected by the fault link broadcasts the fault information, and each node in the broadcast tree passes the fault information and the topology information in the network. The predetermined algorithm re-determines the broadcast tree of the edge node to each node and updates the stored broadcast tree. For example, as shown in FIG. 3, if a link failure occurs between the node 7 and the node 8, the node 7 and/or the node 8 broadcast the link failure information between the node 7 and the node 8, and the nodes 1 and 2 in the broadcast tree are broadcasted. 3, 4, 5, 6, 7, 8, 9, and 10 re-determine the broadcast tree of the edge node 1 to the node through the SPF algorithm, update the originally stored broadcast tree, and manage and maintain the report through the updated broadcast tree. The spread of the text.

In the above method, the method may further include: when a node is added to the broadcast tree, first, the node in the broadcast tree notifies the newly added node of the stored broadcast tree by running the extended specific protocol; secondly, the node in the broadcast tree And the newly added node determines the path of the newly added node to the edge node by using a predetermined algorithm based on the broadcast tree, and finally adds the path of the newly added node to the edge node to the broadcast tree and stores. For example, as shown in FIG. 4, when node 11 is added, node 9 and/or node 10 advertise its stored broadcast tree to node 11 by running the extended 802.1aq protocol, nodes 1 to 10 in the broadcast tree, and The newly added node 11 determines the path of the node 11 to the node 1 by the SPF algorithm based on the determined broadcast tree (as shown by the dotted line in FIG. 3) (ie, node 1 - node 7 - node 8 - node 9 - node 11), broadcast tree The nodes 1 to 10 and the new node 11 in the node 11 add the path of the node 11 to the node 1 to the determined broadcast tree and store it, and the broken line in Fig. 4 indicates the broadcast path of the new broadcast tree.

The network in the embodiment of the present invention may be a network of any topology, and may be a Layer 2 network in an Ethernet or the like.

An embodiment of the present invention further provides a node, as shown in FIG. 5, including:

The obtaining module 51 is configured to obtain topology information in the network by running the extended specific protocol, where the topology information in the network includes: node status of each node in the network, link status between nodes, management virtual network mVLAN information, and edge node information.

Specifically, the specific protocol in the obtaining module 51 may be an 802.1aq protocol, and the 802.1aq protocol is an ITU (International). Telecommunications Union, the International Telecommunications Union, a standard protocol, because the node status and inter-node link status of each node in the network can be learned by running the existing 802.1aq protocol, so the extension of 802.1aq only needs to include mVLAN information and The edge node information may be, wherein the node state may indicate that each node is in a working or closed state, and the inter-node link state may indicate that the link between the nodes is in a normal or fault state. The extension of the 802.1aq can be extended to the TLV packet in the protocol. The extended format can be as shown in Figure 2, where "Type" is used to identify the topology information of the packet used in the transmission network; "Length" is used to Identifies the length of the packet; mVLAN is used to mark the mVLAN information reserved by the network. The mVLAN information can be used to identify the mVLAN; ID is used to identify the information of the edge node, which can be the MAC address of the edge node. The nodes in the network can extend the entire network of the topology information by running the extended 802.1aq protocol, so that all nodes on the entire network can perceive the network. The edge node in .

The broadcast tree determining module 52 is configured to determine, according to a node state, an inter-node link state, and an edge node information in the network acquired by the acquiring module 51, a broadcast node of the edge node to each node by using a predetermined algorithm, according to the mVLAN information. The port of the broadcast tree is dynamically configured, and the broadcast tree is used to propagate management maintenance messages.

Specifically, the predetermined algorithm may include, but is not limited to, a shortest path first SPF algorithm, and the above broadcast tree is automatically saved in each node after being determined.

The edge node may further include a reservation configuration module, configured to reserve an mVLAN to the edge node and configured on the edge node, where the mVLAN is used to carry a message for communication with a service system and is used for management. Maintain network devices in your network.

The port isolation module may be further configured to perform port isolation on the mVLANs of the outbound ports of the broadcast tree to prevent the packets from being forwarded on the mVLANs in the outbound ports of the broadcast tree.

The above node may further include: a fault broadcast module, configured to broadcast fault information.

The broadcast tree determining module 52 is further configured to determine, by the predetermined algorithm, the broadcast tree of the edge node to each node according to the fault information broadcasted in the fault broadcast module and the topology information in the network.

And an update module, configured to update the stored broadcast tree to the broadcast tree of the edge node re-determined by the broadcast tree determining module 52 to each node.

Specifically, when a node in the broadcast tree fails, the node adjacent to the faulty node executes the fault broadcast module, and the nodes other than the faulty node in the broadcast tree execute the broadcast tree determining module 52 and the update module; or,

When a link failure occurs between a node and a node in the broadcast tree, the node connected by the faulty link executes the fault broadcast module, and each node in the broadcast tree executes a broadcast tree determination module 52 and an update module.

The foregoing node may further include: an advertising module, configured to notify the newly added node of the stored broadcast tree by running the extended specific protocol when a node is added to the broadcast tree.

At this time, the broadcast tree determining module 52 is further configured to determine, by using a predetermined algorithm, the path of the newly added node to the edge node based on the stored broadcast tree.

The module is updated at this time, and is also used to add the path of the newly added node to the edge node to the stored broadcast tree.

The specific implementation of the processing functions of the modules included in the foregoing apparatus has been described in the previous method embodiments, and the description thereof will not be repeated here.

It should be noted that, in the above node embodiment, each module included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented; in addition, the specific name of each functional module It is also for convenience of distinguishing from each other and is not intended to limit the scope of protection of the present invention.

In addition, those skilled in the art can understand that all or part of the steps in implementing the foregoing method embodiments may be performed by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium. The storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

The embodiment of the present invention firstly, an MVLAN can be reserved and configured on the network edge node to implement automatic configuration of the management and maintenance channel, and no other manual configuration is required. The specific topology information can be spread by extending the 802.1aq protocol. In the whole network topology information diffusion process, the edge node declares the attribute of the node as an edge node, and regards the mVLAN as a subsidiary topology information attached to the edge node. The two information and the network topology information are spread together. All the nodes of the entire network, each node calculates a broadcast tree from the edge node to all the nodes based on the network topology information, and dynamically configures the ports of the broadcast tree according to the mVLAN. In this way, each node in the network can automatically build a management and maintenance channel to the network edge node (corresponding to the business system such as the background network management). Then, the mVLAN for management and maintenance can be dynamically configured to the corresponding port through the extended 802.1aq protocol, and is calculated based on the topology information of the current network, and the edge node is the root of the other node as the leaf node of the broadcast tree. Dynamically configured to the ingress port and egress port of the broadcast tree. Because the broadcast tree can be changed with the network topology information, and the mVLAN is configured on the edge node, you need to replace other VLANs as the mVLAN for managing the maintenance channel. In this case, only one mVLAN needs to be reconfigured on the network edge node. Therefore, in this technical solution, mVLAN is a dynamic VLAN, and can be dynamically and automatically configured to the corresponding port. Finally, the port isolation of the egress port of the broadcast tree on the mVLAN allows the management and maintenance packets to be forwarded only between the ingress port and the egress port of the broadcast tree, so that each node can only be in the background. The service and maintenance messages are sent and received between the network and other service systems. The nodes do not send and receive packets to each other. Therefore, the management and maintenance related packets are broadcast and replicated between devices, ensuring the safe and reliable operation of network devices.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of it within the technical scope disclosed by the embodiments of the present invention. Variations or substitutions are intended to be covered by the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A method for constructing a management maintenance channel, comprising:

The extended specific protocol is used to obtain topology information in the network, where the topology information includes: a node state in the network, a link state between nodes, management virtual network mVLAN information, and edge node information;

Determining, by the predetermined algorithm, a broadcast tree to the edge node according to the node state, the inter-node link state, and the edge node information in the acquired network, and dynamically configuring a port of the broadcast tree according to the mVLAN information, the broadcast The tree is used to propagate management and maintenance messages.
The method for constructing a management and maintenance channel according to claim 1, wherein the mVLAN is reserved for the edge node and configured on the edge node, and is used for carrying communication with a service system. Messages and network devices used to manage maintenance networks.
The method for constructing a maintenance and maintenance channel according to claim 1, wherein each node in the network obtains topology information in the network by running the extended specific protocol, including:

If the specific protocol is the 802.1aq protocol, the TLV field in the 802.1aq protocol is extended to carry the topology information, and each node in the network obtains the node status of each node in the network by running the extended 802.1aq protocol. , inter-node link status and edge node information.
The method for constructing a management and maintenance channel according to any one of claims 1 to 3, further comprising:

The egress port of the broadcast tree is isolated on the mVLAN to prevent the packets from being forwarded on the mVLANs.
The method for constructing a management and maintenance channel according to any one of claims 1 to 3, further comprising:

When a node in the broadcast tree fails, a node adjacent to the faulty node broadcasts fault information, and other nodes in the broadcast tree other than the faulty node pass the predetermined information according to the fault information and the topology information in the network. Algorithm re-determines the edge node to the broadcast tree of each node and updates the stored broadcast tree; or,

When a link fault occurs between a node and a node in the broadcast tree, the node connected by the fault link broadcasts fault information, and each node in the broadcast tree passes a predetermined algorithm according to the fault information and topology information in the network. Re-determine the edge node to the broadcast tree of each node and update the stored broadcast tree.
The method for constructing a management and maintenance channel according to any one of the preceding claims, wherein when the node is added to the broadcast tree, the method further includes:

The node in the broadcast tree advertises the stored broadcast tree to the newly added node by running the extended specific protocol;

The node in the broadcast tree and the newly added node determine a path of the newly added node to an edge node by using a predetermined algorithm based on the broadcast tree, and add a path of the newly added node to an edge node to the broadcast tree. .
A node, comprising:

An acquiring module, configured to acquire topology information in the network by running the extended specific protocol, where the topology information includes: a node state of each node in the network, a link state between nodes, management virtual network mVLAN information, and edge node information;

a broadcast tree determining module, configured to determine, according to a node state, an inter-node link state, and an edge node information in a network acquired by the acquiring module, a broadcast tree to an edge node by using a predetermined algorithm, and dynamically configuring the device according to the mVLAN information The port of the broadcast tree, where the broadcast tree is used to propagate management maintenance messages.
The node according to claim 7, further comprising:

a reservation configuration module, configured to reserve an mVLAN to the edge node and configured on the edge node, where the mVLAN is used to carry a message for communication with a service system, and is used to manage a network device in the maintenance network. .
The node according to claim 7, wherein the obtaining module is configured to: if the specific protocol is an 802.1aq protocol, extend a TLV field in the 802.1aq protocol to carry the topology information, the network Each node in the network obtains the node status, inter-node link status, and edge node information of each node in the network by running the extended 802.1aq protocol.
The node according to any one of claims 7-9, further comprising:

The port isolation module is configured to perform port isolation on the mVLANs of the egress ports of the broadcast tree to prevent the packets from being forwarded on the mVLANs in the outbound ports of the broadcast tree.
The node according to any one of claims 7-9, further comprising:

A fault broadcast module for broadcasting fault information;

The broadcast tree determining module is further configured to: re-determine a broadcast tree of the edge node to each node by using a predetermined algorithm according to the fault information broadcasted by the fault broadcast module and the topology information in the network;

And an update module, configured to update the stored broadcast tree to the broadcast tree of the edge node re-determined by the broadcast tree determining module to each node;

Specifically, when a node in the broadcast tree fails, the node adjacent to the faulty node executes the fault broadcast module, and the nodes other than the faulty node in the broadcast tree execute the broadcast tree determining module and the node. Update module; or,

When a link failure occurs between a node and a node in the broadcast tree, the node connected by the fault link executes the fault broadcast module, and each node in the broadcast tree executes the broadcast tree determination module and the update module.
The node according to any one of claims 7-9, further comprising:

a notification module, configured to notify the newly added node of the stored broadcast tree by running the extended specific protocol when a node is added to the broadcast tree;

The broadcast tree determining module is further configured to determine, by using a predetermined algorithm, a path of the newly added node to an edge node based on the stored broadcast tree.