CN102148744A - Method and system for reducing package loss during restarting process of stacking device - Google Patents
Method and system for reducing package loss during restarting process of stacking device Download PDFInfo
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- CN102148744A CN102148744A CN2010101095068A CN201010109506A CN102148744A CN 102148744 A CN102148744 A CN 102148744A CN 2010101095068 A CN2010101095068 A CN 2010101095068A CN 201010109506 A CN201010109506 A CN 201010109506A CN 102148744 A CN102148744 A CN 102148744A
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Abstract
The invention discloses a method and a system for reducing package loss during restarting process of a stacking device. A port on an access device connected with the stacking device exits from a trunking group before the restarting of the stacking device is stopped; then the port of the access device connected with the stacking device is set as a receiving-only state firstly, then a port of the stacking device joins in the trunking group after the restarting of the stacking device is started; and the operation of joining the port of the access device into the trunking group reduces message loss and realizes zero package loss.
Description
Technical field
The present invention relates to the technology of piling up, refer in the stack equipment restarting process, reduce the method and system of packet loss especially.
Background technology
Referring to Fig. 1, Fig. 1 links to each other with access device by link aggregation protocols (LACP, Link Aggregation Control Protocol) schematic network structure of service is provided for stack equipment A and stack equipment B are stacked as an equipment.By LACP, the port on stack equipment and the access device carries out polymerization, forms the function that aggregation group realizes load balancing and link backup, the unavailable service that the flow forwarding all can be provided to the opposite end by the another one port of which port in the aggregation group.
When the stack equipment updating software release, need restart stack equipment.In actual networking, in order the time not influence the normal forwarding of message in upgrading, normally restart each stack equipment successively, the flow of restarting equipment is switched on other stack equipments, can provide stable service to guarantee whole pile system.For example, in Fig. 1, restart stack equipment B earlier, flow is switched on the stack equipment A; After stack equipment B upgrading is restarted, restart stack equipment A again and upgrade, guarantee that customer flow does not interrupt, do not influence normal business function.
Restarting process comprises two subprocess: restart and close and restart two processes that start.When stack equipment B restart close after, the port that is attached thereto on the access device A that connects is in disabled state.Access device withdraws from this port from aggregation group by the unavailable incident of echo port, and flow is switched in the aggregation group on the another one available port; After stack equipment B was restarted startup, access device added aggregation group by the available event of echo port again with port, is chosen as away the flow port, and returning of assurance flow cut.
According to above description as can be known, the port status that places one's entire reliance upon of the switching of access device flow.Restart when closing at stack equipment, the port that the access device perception links to each other with stack equipment is unavailable and this port is withdrawed from aggregation group, be later than the actual time of closing of stack equipment, makes access device mail to the message of stack equipment in losing during this period of time.When stack equipment was restarted startup, access device and stack equipment carried out LACP and consult to determine that port adds aggregation group, because the joining day differs, will cause having packet loss between access device and stack equipment.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system that reduce packet loss in the stack equipment restarting process, uses method and system provided by the invention and can reduce the packet loss of stack equipment in restarting process.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that in the stack equipment restarting process, reduces packet loss, stack equipment links to each other with access device by link aggregation protocols, and this method comprises:
Stack equipment restart close before, each access device of being attached thereto of notice;
After access device received that stack equipment is restarted the notice of closing, the port that will link to each other with this stack equipment withdrawed from aggregation group and carries out the flow switching;
After the flow switching was finished, access device sent the notice that has withdrawed from aggregation group to stack equipment;
After stack equipment receives that each access device has withdrawed from the notice of aggregation group, carry out and restart shutoff operation.
A kind of system that in the stack equipment restarting process, reduces packet loss, this system comprises stack equipment and access device, described stack equipment links to each other with described access device by link aggregation protocols;
Described stack equipment, be used for self restart close before, each access device of being attached thereto of notice; And after the notice that withdraws from aggregation group that receives each access device transmission, carry out and restart shutoff operation;
Described access device, be used to receive that described stack equipment is restarted the notice of closing after, the port that will link to each other with this stack equipment withdraws from aggregation group and carries out flow and switch; And after the flow switching is finished, send the notice that has withdrawed from aggregation group to stack equipment.
The method and system that in the stack equipment restarting process, reduce packet loss provided by the present invention, by restart at stack equipment close before, the port that links to each other with stack equipment on the access device is just withdrawed from aggregation group, and after stack equipment is restarted startup, the access device port is set earlier is accepting state only, the port with stack equipment adds aggregation group then, and the port with access device adds aggregation group again, reduce losing of message, realized zero packet loss.
Description of drawings
Fig. 1 provides the network structure of service for stack equipment in the prior art;
Fig. 2 is restarted the flow chart that closes minimizing packet loss method in the closed procedure for the present invention;
Fig. 3 is restarted the flow chart that reduces the packet loss method in the start-up course for the present invention;
Fig. 4 is the flow chart of embodiment of the invention method.
Embodiment
In the detailed description of this part, only, illustrate and described preferred embodiment of the present invention by to implementing the example of the desired best mode of inventor of the present invention.It will be appreciated that and not deviate under the prerequisite of the present invention, it is made amendment with regard to each conspicuous aspect.Correspondingly, it is exemplary in itself that drawing and description should be regarded as, rather than restrictive.
All can there be the packet loss phenomenon in stack equipment restarting to close and restart when starting, and now at these two subprocess technical scheme of the present invention is introduced respectively.At first describe to restart and close subprocess.
Referring to Fig. 2, Fig. 2 is for restarting the exemplary process diagram of closing minimizing packet loss method in the subprocess.Be specially, in step 201, stack equipment restart close before, each access device of being attached thereto of notice; In step 202, after access device received that stack equipment is restarted the notice of closing, the port that will link to each other with this stack equipment withdrawed from aggregation group and carries out the flow switching; In step 203, after the flow switching is finished, send the notice that has withdrawed from aggregation group to stack equipment; In step 204, after stack equipment receives that each access device has withdrawed from the notice of aggregation group, carry out and restart shutoff operation.
In above-mentioned flow process, before stack equipment was closed and restarted, the port that links to each other with stack equipment on the access device just withdrawed from aggregation group.Port withdraws from aggregation group and means that this port no longer learns MAC Address, so flow can not transmitted by this port.Therefore, when stack equipment was closed, the access device port can not send message again, and then just can not lose the message that access device mails to stack equipment yet.Simultaneously, though the port on the access device withdraws from aggregation group, port is still available, can not lose stack equipment and mails to the message that inserts message owing to withdrawing from aggregation group.Through above analysis as can be known, technical scheme shown in Figure 2 can reduce losing of message in the stack equipment restarting process, has realized restarting the zero packet loss that closes closed procedure.
In addition, because the port that links to each other with stack equipment on the access device has withdrawed from aggregation group, this port no longer participates in the load balancing in the aggregation group, it might receive broadcasting packet from stack equipment, and broadcasting packet returned to stack equipment again by other ports in aggregation group on the access device, produce the broadcasting loop, thereby broadcast storm takes place.At this problem, can earlier the port on the stack equipment be withdrawed from aggregation group.This moment, loop generated, flow on the stack equipment switches on other ports of aggregation group, with port on the access device that stack equipment is connected when withdrawing from aggregation group, just can not receive broadcast traffic, and then the broadcast storm of describing before yet just can not producing from stack equipment.In addition, after for fear of stack equipment port being withdrawed from aggregation group, produce broadcast storm based on identical reason, technical solution of the present invention was switched the broadcast traffic of access device upper port other ports to aggregation group earlier before the port with stack equipment withdraws from aggregation group.Like this, the port on the stack equipment equally can not produce broadcast storm yet after withdrawing from aggregation group.In technical scheme of the present invention, as a special broadcasting packet, its processing is identical with broadcasting packet with multicast message.
Concrete scheme can be: after access device received that stack equipment is restarted the notice of closing, access device switched earlier the broadcast traffic that connects each port of stack equipment other ports to the aggregation group.After the broadcast traffic switching is finished, the notice stack equipment.After stack equipment is received the notice that each access device switches broadcast traffic, self port is withdrawed from aggregation group.And send the notice that has withdrawed from aggregation group to each access device.Access device is carried out the operation that the described port that will link to each other with this stack equipment withdraws from aggregation group again after receiving the notice that withdraws from aggregation group that stack equipment sends.
Specifically in the stack equipment side, stack equipment restart close before, each access device that notice is attached thereto; After receiving that each access device withdraws from the notice of aggregation group, carry out and restart shutoff operation.In addition, for fear of producing the broadcasting loop, after stack equipment is received the notice that each access device switches broadcast traffic, self port is withdrawed from aggregation group; And, send the notice that has withdrawed from aggregation group to each access device.
In the access device side, after access device received that stack equipment is restarted the notice of closing, the port that will link to each other with this stack equipment withdrawed from aggregation group and carries out the flow switching; After the flow switching is finished, send the notice that withdraws from aggregation group to stack equipment.Equally, produce the broadcasting loop in order to keep away, access device will withdraw from aggregation group with the port that this stack equipment links to each other and carry out before the flow switching: switch the broadcast traffic that is connected each port of stack equipment; After the broadcast traffic switching is finished, the notice stack equipment; And after receiving the notice that withdraws from aggregation group that stack equipment sends, the port that execution will link to each other with this stack equipment withdraws from aggregation group and carries out the operation that flow switches.
What more than introduce is to restart to close subprocess, below describes and restarts the promoter process.
Referring to Fig. 3, Fig. 3 is for reducing the exemplary process diagram of packet loss method in restarting the promoter process.Be specially, in step 301, after stack equipment was restarted startup, access device started the port self link to each other with described stack equipment and described port is set and only receives message, only receives the notice of message to the stack equipment transmission; In step 302, stack equipment adds aggregation group with self corresponding port, and sends the notice that has added aggregation group to described access device after receiving that access device only receives the notice of message; In step 303, access device adds aggregation group with the port that self links to each other with stack equipment after receiving that stack equipment has added the notice of aggregation group.
In flow process shown in Figure 3, because the state of access device port is when being set to accepting state, the port of stack equipment also is in closed condition, can not send message, also just can not produce packet drop.After the port with stack equipment adds aggregation group,,, therefore can not produce packet drop because the access device corresponding port is an accepting state though the port of stack equipment can be received and dispatched message yet.The port of access device is added aggregation group, restart the operation that the two ends, back add aggregation group, realized restarting the zero packet loss of start-up course thereby finished at stack equipment.
With to close subprocess identical restarting, be accepting state at access device upper port state, the port of stack equipment has added under the situation of aggregation group.Port on the access device might be received broadcasting packet from stack equipment, and broadcasting packet has been returned to stack equipment again by other ports in aggregation group on the access device, produces the broadcasting loop, and broadcast storm takes place.Therefore for fear of producing the broadcasting loop, stack equipment is after restarting startup, add port before the aggregation group, can its enable port but restrictive ports sends broadcasting packet, so just can avoid access device to receive broadcasting packet, and the situation of loop is broadcasted in generation from port; When the port with self added aggregation group, the cancellation port sent the restriction of broadcasting packet.
After stack equipment is restarted startup, do not add before the aggregation group, the port on stack equipment and the access device all is in closed condition, can not send message and can not receive message.To be to carry out the transmitting-receiving of message after the port open, but, do not learn the mac address forwarding table item, therefore can not send unicast message, but can transmit broadcasting packet owing to do not add aggregation group.Stack equipment can be provided with the forwarding that mask limits broadcasting packet on port.Allow to transmit broadcasting packet as 0 expression is set on port, 1 expression is set does not allow to transmit broadcasting packet.In addition, access device starts the port self link to each other with described stack equipment and port is set and only receives message in the step 401, also can realize by the forwarding that limits broadcasting packet.
Concrete, in the stack equipment side, after stack equipment is restarted startup, after receiving that each access device only receives the notice of message, self port is added aggregation group, and send the notice that has added aggregation group to access device.For fear of producing the broadcasting loop, further restart at stack equipment start the back, port added aggregation group before, stack equipment its enable port but restrictive ports sends broadcasting packet; When the port with self added aggregation group, the cancellation port sent the restriction of broadcasting packet.
In the access device side, after stack equipment was restarted startup, access device started the port self link to each other with described stack equipment and described port is set and only receives message, only receives the notice of message to the stack equipment transmission; Access device adds aggregation group with the port that self links to each other with described stack equipment after receiving that stack equipment has added the notice of aggregation group.
In addition, the present invention also provides a kind of system that reduces packet loss in the stack equipment restarting process, and its structure just realizes different in function as shown in Figure 1.Concrete:
Described stack equipment, be used for self restart close before, each access device of being attached thereto of notice; And after the notice that withdraws from aggregation group that receives each access device transmission, carry out and restart shutoff operation; Described access device, be used to receive that described stack equipment is restarted the notice of closing after, the port that will link to each other with this stack equipment withdraws from aggregation group and carries out flow and switch; And after the flow switching is finished, send the notice that has withdrawed from aggregation group to stack equipment.
In addition, described access device is further used for switching the broadcast traffic that connects described each port of stack equipment before the port that will link to each other with this stack equipment withdraws from the switching of aggregation group execution flow; After the broadcast traffic switching is finished, notify described stack equipment; And after receiving the notice that withdraws from aggregation group that described stack equipment sends, carry out the described port that will link to each other and withdraw from the operation that aggregation group is carried out the flow switching with this stack equipment.Accordingly, described stack equipment, be further used for receiving that access device switches the notice of broadcast traffic after, self corresponding port is withdrawed from aggregation group; And send the notice that has withdrawed from aggregation group to corresponding access device.
Described access device is further used for after stack equipment is restarted startup, starts the port that self links to each other with described stack equipment and described port is set only to receive message, sends the notice that only receives message to described stack equipment; And after receiving that stack equipment has added the notice of aggregation group, the port that self links to each other with described stack equipment is added aggregation group; Accordingly, described stack equipment is further used for after receiving that described access device only receives the notice of message, self corresponding port is added aggregation group, and send the notice that has added aggregation group to described access device.
Described stack equipment, be further used for self restart start the back, port added aggregation group before, its enable port but restrictive ports sends broadcasting packet; And when the port with self added aggregation group, the cancellation port sent the restriction of broadcasting packet.
Below enumerating embodiment is further described in detail technical scheme of the present invention.
Present embodiment is realized mutual between stack equipment and the access device by expansion LACP agreement.It mainly is the different conditions that the type lengths values (tlv) of LACP message comes reactor stacking device, access device and port.Wherein, Type:0xFE represents the type that increases newly, handshaking information, a byte; Length: expression length, a byte, assignment is 1, represents that follow-up length is 1 byte; Value: represent the current state of shaking hands, a byte.Specifically can carry out following setting, referring to table one.
| ?Value | The state of shaking hands |
| ?0 | Represent the current non-state of shaking hands that is in |
| ?1 | Expression local terminal equipment requirements opposite end is carried out broadcast traffic and is switched |
| ?2 | Expression local terminal equipment has carried out broadcast traffic and has switched |
| ?3 | Expression local terminal equipment receives that opposite equip. carries out the affirmation after broadcast traffic is switched |
| ?4 | Expression local terminal port has withdrawed from aggregation group |
| ?5 | Expression receives the notice that Peer-Port withdraws from aggregation group, and the local terminal port also withdraws from aggregation group |
| ?6 | Receive that Peer-Port has withdrawed from the notice of aggregation group, flow switches fully |
| ?7 | After startup is restarted in expression, port has been set has only received message |
| 8 | The expression local terminal receives the opposite end and has known that local terminal starts and finish that the local terminal port has added aggregation group, allows the port to participate in flow load sharing |
| 9 | Expression opposite end flow switches, and the local terminal port has added aggregation group, allows the port to participate in flow load sharing |
| 10 | The expression opposite end is load balancing also, receives this state of shaking hands, and the state of shaking hands that needs to remove the port is initial 0 state |
Table one
When stack equipment was restarted, all access devices that stack equipment need link to each other with self carried out alternately, to realize reducing losing of message.Now only introduce the mutual of stack equipment and one of them access device in detail, mutual identical with other access devices with this equipment.
Referring to Fig. 4, wherein the flow process of closing is restarted for stack equipment in step 401～407, step 408～restart for the stack equipment flow process of startup.
In step 401, when stack equipment need be restarted, restart close before the polymerization member port of this equipment of traversal, the state of shaking hands of port is set to 1, and sends each access device that message notifying connected of the state 1 of shaking hands, requires to switch broadcast traffic.
The initial condition of polymerization member port is 0, and in the LACP agreement, and stack equipment knows that by the LACP agreement this equipment need restart upgrading.
In step 402, access device receives that the state of shaking hands is 1 message, the broadcast traffic of the port that local terminal is connected with stack equipment switches on the another one port in the aggregation group, and the state of shaking hands of local terminal port is set to 2, and to send the state of shaking hands be 2 message, and notice stack equipment local terminal equipment has carried out broadcast traffic and switched.
In step 403, stack equipment receives that from port the state of shaking hands is 2 message, and the corresponding port state of shaking hands of local terminal is set to 3.
In step 404, when the state of shaking hands of all the polymerization member ports on the stack equipment B was 3, expression had all switched on the other port with broadcast traffic on the access device that stack equipment B links to each other.At this moment, stack equipment withdraws from the port of self from aggregation group, and port is just forbidden transmitted traffic like this, but allow to receive flow, and the state of shaking hands of self all polymerization member port is set to 4, and to send the state of shaking hands be 4 the message access device to all connections.
After stack equipment all withdrawed from self all polymerization member port from aggregation group, tree type loop generated, and the flow that stack equipment sends all pass through other port transmission in the aggregation group.
In step 405, it is 4 message that access device receives the state of shaking hands, the corresponding port of local terminal is withdrawed from aggregation group, the port state of shaking hands is set to 5, and the LACP state of shaking hands of transmit port is that 5 message is to stack equipment, expression receives the notice that stack equipment withdraws from aggregation group, and the local terminal port also withdraws from aggregation group.
In step 406, receiving the state of shaking hands when the stack equipment upper port is 5 message, and the state of shaking hands of the corresponding port of the port is set to 6, and expression receives that access device has withdrawed from the notice of aggregation group, and flow switches fully.
In step 407, when the state of shaking hands of all polymerization member ports on the stack equipment all was 6, the whole switching of expression flow finished, and stack equipment is restarted and closed.
In step 408, after stack equipment B is restarted startup, the mutual operation LACP that access device and stack equipment are at first stipulated by the LACP agreement selects logic to determine that port can add after the aggregation group, stack equipment starts the port of self, and port blocking transmission broadcasting packet is set, the state of shaking hands that port is set is 7; Access device also starts the port that links to each other with stack equipment, and port blocking transmission broadcasting packet is set, and the state of shaking hands that port is set is 7.At this moment, the port on both sides all can only receive message, and can not send message.
In step 409, access device sends the stack equipment that the state of shaking hands is 7 message, after startup is restarted in expression, port has been set has only received message.
In step 410, stack equipment receives and when the state of shaking hands is 7 message the local terminal corresponding port added aggregation group, and the state of shaking hands that port is set is 8, and this port then can carry out the load balancing of flow.This moment, loop generated, and flow is realized load balancing on the stack equipment.Then, it is 8 the message access device to correspondence that stack equipment sends the state of shaking hands, and represents that to access device local terminal receives the opposite end and known that local terminal starts and finish that the local terminal port has added aggregation group, allows the port to participate in flow load sharing.
Each access device that the stack equipment correspondence is connected when receiving that the state of shaking hands is 7 message, all can add aggregation group with corresponding port.
In step 411, when the access device upper port receives that the state of shaking hands is 8 message, the local terminal port is added aggregation group, and remove the restriction that the port sends broadcasting packet, send the state of shaking hands and be 9 message to stack equipment.This moment, loop disappeared, by participating in flow load sharing after the port adding aggregation group.
In step 412, receive on the stack equipment that the state of shaking hands of then removing this port was 0 when the state of shaking hands was 9 message, and the state of shaking hands of transmit port is 10 to give corresponding access devices.
In step 413, access device receives that when port status was 10 message, the LACP state of shaking hands of removing port was 0.
So far wholely restart end.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. method that in the stack equipment restarting process, reduces packet loss, stack equipment links to each other with access device by link aggregation protocols, it is characterized in that, and this method comprises:
Stack equipment restart close before, each access device of being attached thereto of notice;
After access device received that stack equipment is restarted the notice of closing, the port that will link to each other with this stack equipment withdrawed from aggregation group and carries out the flow switching;
After the flow switching was finished, access device sent the notice that has withdrawed from aggregation group to stack equipment;
After stack equipment receives that each access device has withdrawed from the notice of aggregation group, carry out and restart shutoff operation.
2. method according to claim 1 is characterized in that, this method further comprises:
Access device will further comprise before will withdrawing from the switching of aggregation group execution flow with the port that this stack equipment links to each other: switch the broadcast traffic that is connected described each port of stack equipment; After the broadcast traffic switching is finished, notify described stack equipment;
After stack equipment receives that access device switches the notice of broadcast traffic, self corresponding port is withdrawed from aggregation group, and send the notice that has withdrawed from aggregation group to this access device;
After access device is received the notice that withdraws from aggregation group of stack equipment transmission, carry out the described port that will link to each other and withdraw from the operation that aggregation group is carried out the flow switching with this stack equipment.
3. method according to claim 1 and 2 is characterized in that, this method further comprises:
After stack equipment was restarted startup, access device started the port self link to each other with described stack equipment and described port is set and only receives message, and only receives the notice of message to the stack equipment transmission;
After stack equipment receives that described access device only receives the notice of message, self corresponding port is added aggregation group, and send the notice that has added aggregation group to described access device;
After access device receives that stack equipment has added the notice of aggregation group, the port that self links to each other with described stack equipment is added aggregation group.
4. method according to claim 3 is characterized in that,
Stack equipment is restarted and is started the back, port is added before the aggregation group, its enable port but restrictive ports sends broadcasting packet;
When the port with self added aggregation group, the cancellation port sent the restriction of broadcasting packet.
5. a system that reduces packet loss in the stack equipment restarting process is characterized in that this system comprises stack equipment and access device, and described stack equipment links to each other with described access device by link aggregation protocols;
Described stack equipment, be used for self restart close before, each access device of being attached thereto of notice; And after the notice that withdraws from aggregation group that receives each access device transmission, carry out and restart shutoff operation;
Described access device, be used to receive that described stack equipment is restarted the notice of closing after, the port that will link to each other with this stack equipment withdraws from aggregation group and carries out flow and switch; And after the flow switching is finished, send the notice that has withdrawed from aggregation group to stack equipment.
6. system according to claim 5 is characterized in that,
Described access device is further used for switching the broadcast traffic that connects described each port of stack equipment before the port that will link to each other with this stack equipment withdraws from the switching of aggregation group execution flow; After the broadcast traffic switching is finished, notify described stack equipment; And after receiving the notice that withdraws from aggregation group that described stack equipment sends, carry out the described port that will link to each other and withdraw from the operation that aggregation group is carried out the flow switching with this stack equipment;
Described stack equipment, be further used for receiving that access device switches the notice of broadcast traffic after, self corresponding port is withdrawed from aggregation group; And send the notice that has withdrawed from aggregation group to corresponding access device.
7. according to claim 5 or 6 described systems, it is characterized in that,
Described access device is used for after stack equipment is restarted startup, starts the port that self links to each other with described stack equipment and described port is set only to receive message, sends the notice that only receives message to described stack equipment; And after receiving that stack equipment has added the notice of aggregation group, the port that self links to each other with described stack equipment is added aggregation group;
Described stack equipment is used for after receiving that described access device only receives the notice of message, self corresponding port is added aggregation group, and send the notice that has added aggregation group to described access device.
8. system according to claim 7 is characterized in that,
Described stack equipment, be further used for self restart start the back, port added aggregation group before, its enable port but restrictive ports sends broadcasting packet; And when the port with self added aggregation group, the cancellation port sent the restriction of broadcasting packet.
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