CN100461743C - A method and switch for rapid migration - Google Patents

Abstract

The present invention provides a method and a switch for fast migration, specifically: when a multiple spanning tree instance (MSTI) is newly activated, between MST domains, a downstream multiple spanning tree (MST) domain boundary switch receives a target from an upstream MST domain boundary switch. The handshake request message of the newly activated MSTI returns a handshake response message; after receiving the handshake response message, the upstream MST domain border switch transfers the newly activated MSTI to the forwarding state. Applying the scheme of the present invention, since the upstream MST domain border switch can quickly migrate the newly activated MSTI to the forwarding state without waiting for a certain delay, so that the virtual local area network (VLAN) can be quickly migrated to the forwarding state, and the reliability of VLAN connectivity is improved. overall performance.

Description

A method and switch for rapid migration

technical field

The invention relates to the technology in the field of virtual local area network, in particular to a fast migration method and a switch.

Background technique

Virtual Local Area Network (VLAN, Virtual Local Area Network) is a technology that realizes a virtual workgroup by logically dividing devices in a local area network into network segments. In virtual local area network networking, because the switch in the layer 2 network cannot specify how many times the message can be forwarded like the router, once there is a loop in the network, it will cause the message to circulate and proliferate continuously in the loop, resulting in a broadcast storm.

In this case, Spanning Tree Protocol (STP, Spanning Tree Protocol) came into being. The STP protocol is a layer-2 management protocol. Devices running this protocol can discover loops in the network by exchanging information with each other, and properly block some ports to eliminate loops, and finally prune the loop network into a network without loops. Loop tree network, so as to avoid the continuous proliferation and infinite loop of packets in the loop network.

In the process of spanning a tree network, in order not to generate temporary loops, STP adopts a state transition mechanism, and stipulates that the root port and designated port specified in the spanning tree process need to go through a certain delay before entering forwarding. state, in order to actually forward the data. However, STP cannot implement fast migration. Even on a point-to-point link or an edge port, a certain delay must pass before migrating to the forwarding state. Rapid Spanning Tree Protocol (RSTP, Rapid Spanning Tree Protocol) was proposed to overcome the shortcomings of the STP protocol that cannot be quickly migrated, but like the STP protocol, RSTP can only enable all switches in the LAN to share a spanning tree, and cannot By itself to block redundant links, all VLAN packets must be forwarded along a spanning tree.

For this reason, a Multiple Spanning Tree Protocol (MSTP, Multiple Spanning Tree Protocol) is currently proposed to make up for the defects of STP and RSTP, which can not only quickly migrate, but also make different VLAN packets forward according to their respective paths. MSTP divides the entire switching network into several multiple spanning tree domains (MST, Multiple Spanning Tree), and each MST domain generates a common spanning tree (CST, Common Spanning Tree) through calculation. In each MST domain, multiple independent spanning trees can be calculated and generated, and each independent spanning tree is called a multiple spanning tree instance. VLANs with the same topology can be mapped to the same instance, and the forwarding state of the VLAN on the port depends on the state of the corresponding instance in MSTP. In addition, the instances in the domain are divided into Internal Spanning Tree (IST, Internal Spanning Tree) instances and Multiple Spanning Tree Instances (MSTI, Multiple Spanning TreeInstance). Among them, IST is also called 0 instance, which can form the whole exchange together with the CST between domains. The spanning tree of the network, that is, the common and internal spanning tree (CIST, Common and Internal SpanningTree), other multiple spanning tree instances do not have this function.

MSTP also stipulates that each instance in the MST domain can quickly enter the forwarding state using a method similar to that in RSTP, while only CIST instances between MST domains can quickly enter the forwarding state using this method. In this case, if a new VLAN is newly created and a corresponding multiple spanning tree instance MSTI is newly activated for this purpose, then the multiple spanning tree instance can only be quickly migrated within the domain, and must follow the MSTP protocol between domains. According to the protocol, the forwarding state can only be entered after a delay of 30 seconds, thus affecting the overall performance of VLAN connectivity.

It can be seen that the prior art cannot quickly migrate multiple spanning tree instances between domains.

Contents of the invention

In view of this, the first object of the present invention is to provide a method for implementing fast migration, which can perform fast migration of newly activated multiple spanning tree instances between domains.

The second object of the present invention is to provide a switch that can quickly migrate newly activated multiple spanning tree instances between domains.

For above-mentioned first invention object, the technical scheme that the present invention proposes is:

A fast migration method. The downstream MST domain border switch and the upstream MST domain border switch are in different MST domains. When the multiple spanning tree instance MSTI is newly activated, between MST domains, the method is as follows:

a. The downstream multi-spanning tree MST domain border switch receives the handshake request message from the upstream MST domain border switch for the newly activated MSTI, and then returns the handshake response message;

b. After receiving the handshake response message, the upstream MST domain border switch transitions the newly activated MSTI to the forwarding state.

In the above scheme, the step a further includes between the downstream MST domain border switch receiving the handshake request message and returning the handshake response message:

X, the downstream MST domain border switch judges whether it needs to return a handshake response message to the upstream MST domain border switch according to the received handshake request message, if necessary, then continue to execute; otherwise, process the above according to the processing method of the MSTP protocol Handshake request message, and then exit this process.

In the above scheme, the method of the step X is specifically:

X1, the downstream MST domain border switch first judges whether the received handshake request message carries the configuration information of the newly activated MSTI, if so, then executes step X2; otherwise, processes the above according to the inter-domain processing method of the MSTP protocol Handshake request message, and then exit this process;

X2, then judge whether the handshake flag in the configuration information of the newly activated MSTI is set, if set, then perform step X3; otherwise, process the handshake request message according to the inter-domain processing method of the MSTP protocol, and then exit this process;

X3, then judge whether the forwarding state flag bit of the public and internal spanning tree CIST instance in the handshake request message is set, if set, then determine that the CIST instance is in the forwarding state, and itself needs to return the handshake to the upstream MST domain boundary switch Response message; otherwise, process the handshake request message according to the inter-domain processing method of the MSTP protocol, and then exit this process.

In the above scheme, when the downstream MST domain border switch receives the handshake request message, it further includes before the step X1:

The downstream MST domain border switch judges whether the content of the MST domain configuration identifier in the handshake request message is the same as the content of its existing MST domain configuration identifier, if not, proceed to step X1; otherwise, follow the intra-domain processing method of the MSTP protocol to process the handshake request message, and then exit this process.

In the above solution, the handshake response message returned by the downstream MST domain border switch is: a handshake response message in which the CIST instance agrees with the handshake flag in the message is set.

In the above scheme, the step b is specifically:

b1. The upstream MST domain border switch receives the handshake response message, and judges that the handshake response message comes from the downstream MST domain border switch according to the content of the MST domain configuration identifier in the handshake response message;

b2. The upstream MST domain border switch then judges whether the CIST instance agrees with the handshake flag in the message is set, and if it is set, the newly activated MSTI is transferred from the original blocking state to the forwarding state.

In the above solution, before the new activation of the MSTI, the method further includes: creating a virtual local area network VLAN corresponding to the MSTI, and the created VLAN is a VLAN created through static configuration, or a VLAN created through dynamic learning.

For the second purpose of the invention, the technical solution proposed by the present invention is:

A switch, at least including a transceiver unit, a protocol message processing unit for processing messages according to the Multiple Spanning Tree Protocol MSTP protocol,

The transceiver unit is further configured to: when receiving a handshake request message from an upstream MST domain boundary switch of a different multiple spanning tree MST domain for a newly activated multiple spanning tree instance MSTI, return a handshake response message, so that the upstream MST domain After receiving the handshake response message, the border switch transitions the newly activated MSTI to the forwarding state.

In the above solution, the switch further includes:

The response judging unit is used to judge whether it is necessary to return a handshake response message to the upstream MST domain border switch according to the handshake request message received by the transceiver unit, and if necessary, return the handshake response message through the transceiver unit; The protocol message processing unit processes the handshake request message.

In the above scheme, the response discrimination module includes:

The configuration information discrimination module is used to judge whether the handshake request message received by the transceiver unit carries the configuration information of the newly activated MSTI, and if so, sends the message to the handshake discrimination module; if not carried, the protocol message a processing unit to process the handshake request message;

The handshake discrimination module is used to judge whether the handshake flag in the configuration information of the newly activated MSTI is set, if it is set, the message is sent to the CIST forwarding state discrimination module; if it is not set, the protocol message processing unit to process the handshake request message;

The CIST forwarding state discrimination module judges whether the forwarding state flag bit of the CIST instance in the handshake request message is set, if set, then returns the handshake response message to the upstream MST domain border switch through the transceiver unit; if not set, then by The protocol message processing unit processes the handshake request message.

In the above solution, the response judging unit further includes:

The message type discrimination module is used to judge whether the content of the MST domain configuration identification in the handshake request message received by the transceiver unit is the same as the content of the existing MST domain configuration identification of the switch itself, if not, the message is sent to the configuration An information discriminating module; if they are the same, the protocol message processing unit directly processes the handshake request message.

To sum up, a method and a switch for realizing fast migration proposed by the present invention, when the corresponding MSTI is newly activated, when the downstream MST domain boundary switch receives the handshake request message sent by the upstream MST domain boundary switch, it can After returning the handshake response message, the upstream MST domain border switch can quickly migrate the newly activated MSTI to the forwarding state without waiting for a certain delay, so that it can quickly migrate the VLAN to the forwarding state and improve the overall performance of VLAN connectivity.

Description of drawings

Fig. 1 is a flow chart of the present invention;

Fig. 2 is a schematic diagram of networking of a method embodiment of the present invention;

Fig. 3 is a schematic diagram of a message structure in a method embodiment of the present invention;

Fig. 4 is the flowchart of the method embodiment of the present invention;

Fig. 5 is a schematic diagram of the internal structure of the switch of the present invention;

Fig. 6 is a schematic diagram of the internal structure of the switch embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The basic idea of the present invention is: when the MSTI is newly activated, the downstream MST domain border switch that receives the handshake request message will return the handshake response message to the upstream MST domain border switch. In this way, the upstream MST domain border switch can migrate the newly activated MSTI to the forwarding state, so as to achieve the purpose of fast migration.

Fig. 1 is a flow chart of implementing fast migration between domains in the present invention. As shown in Figure 1, when the corresponding MSTI is newly activated, the method for implementing fast migration between domains may include the following steps:

Step 101: The downstream MST domain border switch receives a handshake request message for the newly activated MSTI from the upstream MST domain border switch, and returns a handshake response message.

In this step, when the downstream MST domain border switch receives the handshake request message from the upstream MST domain border switch, it does not ignore the MSTI part in the message as stipulated in the MSTP protocol, and does not return the handshake response message, but Returns the handshake response message to the upstream multiple spanning tree MST domain border switch.

In order to ensure that the handshake response message is returned correctly, the downstream MST domain border switch may further include the following before returning the handshake response message:

Step X: The downstream MST domain border switch judges whether it needs to return a handshake response message to the upstream MST domain border switch according to the received handshake request message, if necessary, continue to execute; otherwise, follow the inter-domain processing method of the MSTP protocol Process the handshake request message, and then exit this process.

Here, the step X may specifically be:

X1, the downstream MST domain border switch first judges whether the received handshake request message carries the configuration information of the newly activated MSTI, if so, then executes step X2; otherwise, processes the above according to the inter-domain processing method of the MSTP protocol Handshake request message, and then exit this process;

In practical applications, each time an MSTI is activated, the switch will add the configuration information of the newly activated MSTI to the original message. In this way, the downstream MST domain border switch can obtain all MSTI configuration information from the handshake request message. If it detects that there is newly added MSTI configuration information, it can determine that a certain VLAN is currently created and a certain MSTI is newly activated. , the newly added MSTI configuration information in the message is the configuration information of the newly activated MSTI.

The characteristic of the inter-domain processing method of the MSTP protocol is that the switch only processes the CIST instance part in the message, and ignores all MSTI parts. As for how to deal with it, please refer to the MSTP protocol, and will not repeat it here.

X2, the downstream MST domain boundary switch judges whether the handshake flag is set in the configuration information of the newly activated MSTI, if set, then perform step X3; otherwise, process the handshake request message according to the inter-domain processing method of the MSTP protocol, Then exit this process;

Since the handshake request message sent is for the newly activated MSTI, the upstream MST domain border switch needs to set the handshake flag in the corresponding MSTI configuration information in the message. When the downstream MST domain border switch receives the handshake request message, it can confirm through the handshake flag of the MSTI configuration information that a certain MSTI has been newly activated and requires fast migration.

Of course, if the handshake flag is not set, for example, fast migration is not required, then the downstream MST domain border switch may not return the handshake response message, but process the handshake request message according to the inter-domain processing method of the MSTP protocol.

X3, the downstream MST domain border switch judges whether the forwarding state flag bit of the CIST instance in the handshake request message is set, if set, then it is determined that the CIST instance is in the forwarding state, and itself needs to return a handshake response message to the upstream MST domain border switch; Otherwise, process the handshake request message according to the inter-domain processing method of the MSTP protocol, and then exit this procedure.

In practical applications, when the downstream MST domain border switch receives the handshake request message, the calculation of the entire network spanning tree may not be stable, and the CIST instance is not in the forwarding state, such as in the blocking state or learning state. In this case, if the handshake response message is directly returned to the upstream MST domain border switch, a loop may be caused, resulting in a broadcast storm. In order to avoid loops, the downstream MST domain border switch can further clarify whether the CIST instance is in the forwarding state as in step X3. When the CIST instance is in the forwarding state, the downstream MST domain border switch can determine that it needs to return a handshake response message.

The present invention only relates to the case of message processing between MST domains, but in fact, any switch in the network will continuously send messages to its own downstream switch, regardless of whether the downstream switch is a switch in the domain or a switch outside the domain. That is to say, the handshake request message received by the switch may come from within the domain or from outside the domain. Then, when the handshake request message is received, before performing step X1, it may further include:

The downstream domain border switch judges whether the content of the MST domain configuration identifier in the handshake request message is the same as the content of its own existing MST domain configuration identifier, and if not, proceed to step X1; otherwise, follow the intra-domain processing method of the MSTP protocol. Process the handshake request message, and then exit this process.

The MST domain configuration identifier described here includes a domain name, a revision level, and a mapping relationship between a VLAN and an instance, and only switches with the same content of the MST domain configuration identifier are in the same MST domain. If it is determined that the content of the MST domain configuration identifier is different, the switch that sends the handshake request message and the switch that receives the handshake request message belong to switches in two different domains, and the processing of the message belongs to the situation of inter-domain processing. It can be realized by using the method of the present invention; and if it is judged that the content of the MST domain configuration identifier is the same, then the two switches belong to switches in the same MST domain, and they can be processed directly by using the intra-domain processing method of the MSTP protocol. How to deal with the intra-domain processing method of the MSTP protocol belongs to the prior art, and will not be repeated here.

Step: 102: After receiving the handshake response message, the upstream MST domain border switch transitions the newly activated MSTI to the forwarding state.

In this step, the upstream MST domain border switch can directly migrate the newly activated MSTI to the forwarding state without going through a certain delay, thereby speeding up the speed of migrating the VLAN to the forwarding state, or improving the overall performance of VLAN connectivity.

In addition, it should be noted that according to the provisions of the MSTP protocol, an instance is only a logical concept. Multiple independent and different instances can correspond to the same network composed of physical switches, and whether an instance is in the forwarding state depends on the It depends on whether the corresponding port on each switch is in the forwarding state. Therefore, the above-mentioned switch that migrates a certain instance to the forwarding state is actually to migrate a certain port to the forwarding state, allowing data in the instance to be forwarded through the port. Of course, the state of a certain physical port may be different in different instances. For example: A port of a certain switch is blocked for instance 1, but it may be forwarded for instance 2 at the same time.

In order to better illustrate the solution of the present invention, a preferred embodiment is used for a detailed description below.

FIG. 2 is a schematic diagram of MSTP networking in this embodiment. As shown in FIG. 2 , there are two MST domains in this embodiment, switches A1-A4 belong to domain A, and switches B1-B3 belong to domain B. Among them, switch A1 is the general CIST root and the regional root of domain A, the CIST general root is the root of the CIST spanning tree generated by the entire switching network, and the domain root is the root of multiple spanning trees in the domain; switch B2 is domain B The domain root of each switch; the port type connected to each switch is TRUNK type, allowing all VLANs to pass through; each switch can run the attribute registration protocol (GVRP, GARP VLAN Registration Protocol), switches A1 and B1 are GVRP registration attribute sources, configured with the same static VLAN. The GVRP protocol described here is a VLAN dynamic learning protocol, which can be used to propagate VLAN information in the network, thereby creating a VLAN. As for how to use the GVRP registration attribute source to propagate the VLAN information, it belongs to the prior art and will not be repeated here.

When the MSTP calculation and GVRP learning in the network are stable, the VLAN information on switches A1 and B1 has been propagated to the entire network, and a VLAN is created with the path A1-A2-A4-B3-B2-B1.

In this embodiment, assuming that the created VLAN corresponds to a certain MSTI, MSTP will activate the MSTI, and each switch will send a handshake request message requiring fast migration to its downstream switch.

Fig. 3 is a schematic diagram of the message format sent by the switch in MSTP. As shown in Figure 3, the message includes a part containing a CIST instance and an MSTI instance part. Among them, the part containing the CIST instance is the first byte to 102 bytes of the message, which is the basic part of the message, usually including the protocol identifier (ProtocolIdentifier), protocol version identifier (Protocol Version Identifier), CIST flag (CISTFlags), MST Configuration identifier (MST Configuration Identifier), etc.; an MSTI instance part occupies 16 bytes, including MSTI flags (MSTI Flags) and other parts, and each newly activated MSTI will be accumulated after the original message. For example: the message sent by the original switch to the downstream switch already has an MSTI instance part, which occupies 103-118 bytes. If another instance is activated, the switch will add the newly activated MSTI instance part to the original message, occupying 119-135 bytes, and so on.

In this embodiment, the switch processes the handshake request message in two cases: one is intra-domain processing, and the other is inter-domain processing. For the domain, each instance is independent and can be quickly migrated according to the MSTP protocol, that is, A1-A2-A4 can be quickly connected, and B3-B2-B1 can also be quickly connected. But for inter-domain, it is necessary to use the method shown in the flow chart in Figure 4 to realize fast migration.

As shown in Figure 4, the method for fast MSTI migration between domains in this embodiment may include:

Step 401: switch A4 sets the newly activated MSTI to a blocking state, and sends a handshake request message for the newly activated MSTI to the downstream switch B3;

Step 402: The switch B3 receives the handshake request message from the upstream switch A4, and records the MST domain configuration identifier;

Steps 403 to 404: Switch B3 judges whether the content of the MST domain configuration identifier is the same as that of its own original MST domain configuration identifier, and if not, executes step 405; otherwise, processes the MST domain according to the intra-domain processing method of the MSTP protocol. Handshake request message, and then exit this process.

Steps 405 to 406: Switch B3 judges whether the received handshake request message carries configuration information of a newly activated MSTI, and if so, executes Step 407; otherwise, processes the MSTI according to the inter-domain processing method of the MSTP protocol. Handshake request message, and then exit this process;

In step 405 described here, switch B3 can first record all MSTI configuration information in the message, and compare it with the MSTI configuration information originally recorded by itself. If there is newly added MSTI configuration information, it can determine the newly added MSTI configuration information. The MSTI is the configuration information of the currently newly activated MSTI, that is, the configuration information of the newly activated MSTI is carried in the handshake request message.

Steps 407 to 408: Switch B3 judges whether the handshake flag in the configuration information of the newly activated MSTI is set, and if it is set, execute step 409; otherwise, process the handshake according to the inter-domain processing method of the MSTP protocol Request message, and then exit this process;

The MSTI configuration information includes an MSTI flag part, and the MSTI flag occupies 8 bits, the seventh bit of which represents the handshake flag bit. If the handshake flag is "1", it means set, that is, the upstream switch requires the downstream switch to respond to the fast migration of the MSTI; if the handshake flag is "0", it does not require the downstream switch to respond.

Steps 409-410: Switch B3 judges whether the forwarding state flag of the CIST instance in the handshake request message is set, and if it is set, it determines that the CIST instance is in the forwarding state, and it needs to return a handshake response message to the upstream MST domain border switch, And execute step 411; otherwise, process the handshake request message according to the inter-domain processing method of the MSTP protocol, and then exit this process.

The CIST flag also occupies 8 bits, wherein the third bit represents the forwarding state flag of the CIST instance, if the flag is "1", it means that the CIST instance is in the forwarding state; otherwise, it means that the CIST instance is not in the forwarding state . In this way, the switch B3 can judge whether the CIST instance is in the forwarding state through the third bit of the CIST flag. Only when the newly activated MSTI is migrated to the forwarding state when the CIST instance is in the forwarding state, can loops be avoided and the MSTI migration be more reliable.

Step 411: The switch B3 sets the handshake flag of the CIST instance in the handshake response message, and then returns the handshake response message to the switch A4;

In practical applications, if a switch receives a handshake request message from an activated MSTI in the domain, if the handshake is agreed, the switch will set the handshake flag of the activated MSTI in the handshake response message, and Return the handshake response message. But in the present embodiment, switch A4 is domain border switch, according to the regulation of MSTP agreement, should only process the CIST instance part of message, if switch B3 refers to the method for processing in the domain and sets the agreement handshake sign of the newly activated MSTI, switch A4 cannot obtain the information that the downstream switch B3 has agreed to handshake. Therefore, in this embodiment, the switch B3 sets the agreed handshake flag of the CIST instance, that is, sets the second bit of the CIST flag.

Step 412: Switch A4 receives the handshake response message, and judges that the handshake response message comes from the downstream MST domain boundary switch according to the content of the MST domain configuration identifier in the handshake response message;

Like the switch B3, if the switch A4 receives the handshake response message from the domain, it can process the handshake response message according to the intra-domain processing method of the MSTP protocol.

Step 413: The upstream MST domain border switch judges that the agreed handshake flag of the CIST instance in the message is set, and directly transfers the newly activated MSTI from the original blocking state to the forwarding state.

Applying the scheme of this embodiment, when the switch B3 receives the handshake request message, it can return the handshake response message to the switch A4 under the condition that the CIST is in the forwarding state under the condition that the handshake request message is clear that the handshake request message is from outside the domain. A4 quickly migrates the newly activated MSTI to the forwarding state. Afterwards, since the switch A4 migrates the MSTI to the forwarding state, the part A4-B3 is quickly connected, thereby improving the overall performance of the VLAN connection.

With regard to the above method for implementing fast migration, the present invention also provides a switch that can realize fast migration between domains.

Fig. 5 is a schematic diagram of the basic structure of the switch in the present invention. As shown in Figure 5, the switch at least includes:

The transceiver unit 501 is configured to receive and send messages exchanged between switches according to the MSTP protocol, and send them to the protocol message processing unit 502, and is also used to receive a handshake request from an upstream MST domain border switch for a newly activated MSTI When sending a message, return a handshake response message;

The protocol message processing unit 502 is configured to process the received message according to the MSTP protocol.

In order to better illustrate the solution of the present invention, a preferred embodiment is proposed below. Fig. 6 shows a schematic diagram of the internal structure of the switch in this embodiment. As shown in Figure 6, in addition to including the transceiver unit 501 and the protocol message processing unit 502 in Figure 5, in order to ensure that the transceiver unit 501 returns the handshake response message correctly and avoid loops, the switch can further include :

Response judging unit 503, for judging whether need to return handshake response message to upstream MST domain border switch according to the handshake request message that transceiver unit 501 receives, if necessary, then return handshake response message by transceiver unit 501; If not , the protocol message processing unit 502 processes the handshake request message.

Wherein, the response judging unit 503 may also include:

The configuration information discriminating module 5031 is used to judge whether the handshake request message received by the transceiver unit 501 carries the configuration information of the newly activated MSTI, and if so, sends the message to the handshaking discriminating module 5032; The protocol message processing unit 502 is used to process the handshake request message;

The handshake discrimination module 5032 is used to judge whether the handshake flag in the configuration information of the newly activated MSTI is set, if it is set, the message is sent to the CIST forwarding state discrimination module 5033; if it is not set, the protocol message a processing unit 502 to process the handshake request message;

The CIST forwarding state discrimination module 5033 judges whether the forwarding state flag bit of the CIST instance in the handshake request message is set, if set, then returns the handshake response message to the upstream MST domain border switch by the transceiver unit 501; if not set, Then the protocol message processing unit 502 processes the handshake request message.

In addition, the present invention only relates to the case of message processing between MST domains, but in fact, the handshake request message received by the switch may come from within the domain or from outside the domain. In order to better distinguish whether the message is an intra-domain message or an out-of-domain message, the response judging unit 503 may further include:

The message type discrimination module 5034 is used to judge whether the content of the MST domain configuration identification in the handshake request message received by the transceiver unit 501 is the same as the content of the existing MST domain configuration identification of the switch itself, if not, the message is sent to the configuration information judging module 5031; if they are the same, the protocol message processing unit 502 will directly process the handshake request message.

In this way, when the transceiver unit 501 of the switch receives the handshake request message from the upstream MST domain border switch, the message type discrimination module 5034 first judges whether the content of the MST domain configuration identifier in the handshake request message is consistent with the existing switch itself. The content of the MST domain configuration identification is the same, if not, the message is sent to the configuration information discrimination module 5031; the configuration information discrimination module 5031 judges whether the handshake request message carries the configuration information of the newly activated MSTI, if so, then The message is sent to the handshake discrimination module 5032; the handshake discrimination module 5032 judges whether the handshake flag in the configuration information of the newly activated MSTI is set, and if it is set, the message is sent to the CIST forwarding state discrimination module 5033; the CIST forwarding state The judging module 5033 continues to judge whether the forwarding status flag of the CIST instance in the handshake request message is set, and if it is set, the sending and receiving unit 501 returns a handshake response message to the upstream MST domain border switch. Of course, if the message type discrimination module 5034 judges that the content of the MST domain configuration identification in the handshake request message is different from the content of the existing MST domain configuration identification of the switch itself, then the message is directly sent to the protocol message processing unit 502 If the configuration information discriminating module 5031 judges that the configuration information of the newly activated MSTI is not carried in the message, the message is also directly sent to the protocol message processing unit 502 for processing; if the handshake discriminating module 5032 judges that the newly activated MSTI The handshake flag in the MSTI configuration information is not set, and the handshake request message is also processed by the protocol message processing unit 502; similarly, if the CIST forwarding state judgment module 5033 judges the forwarding state of the CIST instance in the handshake request message If the flag bit is not set, the protocol message processing unit 502 also processes the handshake request message.

In addition, the protocol message processing unit 502 includes an intra-domain message processing module and an inter-domain message processing module, which respectively process intra-domain and inter-domain messages according to the MSTP protocol.

Applying the scheme of this embodiment, when the switch receives the handshake request message, it can determine whether it should return the handshake response message to the upstream MST domain border switch through the response judging unit 503, which can ensure that the message is correctly responded and avoids loops. In this way, when the upstream MST domain border switch receives the handshake response message, it can quickly migrate the newly activated MSTI to the forwarding state, thereby improving the overall performance of VLAN connectivity.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. the method for a fast transferring is characterized in that, downstream multiple spanning tree Multiple Spanning Tree (MST) region edge switch is in different Multiple Spanning Tree (MST) region with upstream Multiple Spanning Tree (MST) region edge switch, and when new activation Multiple Spanning Tree Instance MSTI, between Multiple Spanning Tree (MST) region, this method is:

A, downstream multiple spanning tree Multiple Spanning Tree (MST) region edge switch receive from the handshake request message of upstream Multiple Spanning Tree (MST) region edge switch at the MSTI of new activation, return the handshake response message again;

B, upstream Multiple Spanning Tree (MST) region edge switch receive the MSTI migration that will newly activate behind the handshake response message and are forwarding state.

2. method according to claim 1 is characterized in that, the described downstream of step a Multiple Spanning Tree (MST) region edge switch receives the handshake request message and returns between the handshake response message and further comprises:

X, downstream Multiple Spanning Tree (MST) region edge switch according to the handshake request message that receives judge self whether needs upstream the Multiple Spanning Tree (MST) region edge switch return the handshake response message, if desired, then continue execution; Otherwise, handle described handshake request message according to the processing method of MSTP agreement, withdraw from this flow process again.

3. method according to claim 2 is characterized in that, the method for described step X is specially:

X1, downstream Multiple Spanning Tree (MST) region edge switch judge in the handshake request message that receives whether carry the configuration information of the MSTI of new activation earlier, if having, and execution in step X2 then; Otherwise, handle described handshake request message according to processing method between the territory of MSTP agreement, withdraw from this flow process again;

X2, judge that shaking hands in the configuration information of MSTI of described new activation indicates whether set again, if set, then execution in step X3; Otherwise, handle described handshake request message according to processing method between the territory of MSTP agreement, withdraw from this flow process again;

X3, judge the whether set of forwarding state flag bit of Common and Internal Spanning Tree CIST example in the described handshake request message then, if set, then determine the CIST example and be in forwarding state, self needing upstream, the Multiple Spanning Tree (MST) region edge switch returns the handshake response message; Otherwise, handle described handshake request message according to processing method between the territory of MSTP agreement, withdraw from this flow process again.

4. method according to claim 3 is characterized in that, when downstream Multiple Spanning Tree (MST) region edge switch receives the handshake request message, further comprises before described step X1:

The content that downstream Multiple Spanning Tree (MST) region edge switch is judged Multiple Spanning Tree (MST) region configuration identifier in the handshake request message whether content with self existing Multiple Spanning Tree (MST) region configuration identifier is identical, if inequality, then continues execution in step X1; Otherwise, handle described handshake request message according to processing method in the territory of MSTP agreement, withdraw from this flow process again.

5. according to each described method of claim 1 to 4, it is characterized in that the handshake response message that described downstream Multiple Spanning Tree (MST) region edge switch returns is: with agree the to shake hands handshake response message of flag set of CIST example in the message.

6. method according to claim 5 is characterized in that, described step b is specially:

B1, upstream Multiple Spanning Tree (MST) region edge switch receive the handshake response message, judge described handshake response message from downstream Multiple Spanning Tree (MST) region edge switch according to the content of handshake response message Multiple Spanning Tree (MST) region configuration identifier;

B2, upstream Multiple Spanning Tree (MST) region edge switch judge in the message that the CIST example is agreed to shake hands again and indicate whether set that if set, then the MSTI that will newly activate is forwarding state from original blocked state migration.

7. method according to claim 1, it is characterized in that before the described new activation MSTI, this method further comprises: create and MSTI corresponding virtual local area network (LAN) VLAN, the VLAN of the VLAN of described establishment for creating, perhaps VLAN for creating by dynamic learning by static configuration.

8. switch, comprise Transmit-Receive Unit at least, with message according to the protocol massages processing unit that Multiple Spanning Tree Protocol MSTP handles, it is characterized in that,

Described Transmit-Receive Unit is further used for: when receiving from the upstream Multiple Spanning Tree (MST) region edge switch of different multiple spanning tree Multiple Spanning Tree (MST) region at the handshake request message of the Multiple Spanning Tree Instance MSTI of new activation, return the handshake response message, the MSTI migration that makes upstream Multiple Spanning Tree (MST) region edge switch will newly activate after receiving the handshake response message is forwarding state.

9. switch according to claim 8 is characterized in that, this switch further comprises:

Respond judgement unit, the handshake request message that is used for receiving according to Transmit-Receive Unit judge whether needs upstream the Multiple Spanning Tree (MST) region edge switch return the handshake response message, if desired, then return the handshake response message by Transmit-Receive Unit; If do not need, then handle described handshake request message by the protocol massages processing unit.

10. according to the switch under the claim 9, it is characterized in that described response discrimination module comprises:

The configuration information discrimination module is used to judge whether the handshake request message that Transmit-Receive Unit receives carries the configuration information of the MSTI of new activation, if having, then message is sent to the discrimination module of shaking hands; If do not carry, then handle described handshake request message by the protocol massages processing unit;

The discrimination module of shaking hands is used for judging that the shaking hands of configuration information of the MSTI of new activation indicates whether set, if set then sends to message CIST forwarding state discrimination module; If there is not set, then handle described handshake request message by the protocol massages processing unit;

CIST forwarding state discrimination module is judged the whether set of forwarding state flag bit of CIST example in the handshake request message, if set, then by Transmit-Receive Unit upstream the Multiple Spanning Tree (MST) region edge switch return the handshake response message; If there is not set, then handle described handshake request message by the protocol massages processing unit.

11. switch according to claim 10 is characterized in that, described response judgement unit further comprises:

The type of message discrimination module, be used for judging whether Transmit-Receive Unit receives the content of handshake request message Multiple Spanning Tree (MST) region configuration identifier identical with the content of the existing Multiple Spanning Tree (MST) region configuration identifier of switch self, if inequality, then message is sent to the configuration information discrimination module; If identical, then directly handle described handshake request message by the protocol massages processing unit.

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