CN103581038B - Load sharing implementation method and device - Google Patents
Load sharing implementation method and device Download PDFInfo
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- CN103581038B CN103581038B CN201310549883.7A CN201310549883A CN103581038B CN 103581038 B CN103581038 B CN 103581038B CN 201310549883 A CN201310549883 A CN 201310549883A CN 103581038 B CN103581038 B CN 103581038B
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Abstract
The invention provides a load sharing implementation method and device. According to the technical scheme, when messages belonging to a service instance and coming from a user network are received, one derivative I-SID is selected from a plurality of derivatives I-SID corresponding to the service instance, and the messages are forwarded according to forwarding table items corresponding to the derivatives I-SID. By the adoption of the load sharing implementation method and device, flow load sharing in the same service instance can be achieved.
Description
Technical field
The application is related to communication technical field, and more particularly to one kind is applied to shortest path bridging (Shortest Path
Bridge, SPB) load balancing implementation method in network and device.
Background technology
SPB is one of ethernet standard of IEEE802.1aq definition, is further prolonging for Multiple Spanning Tree Protocol (MSTP)
Stretch, it is intended to build the clog-free double layer network of large flat, using the shortest path bridging based on Intermediate System-to-Intermediate System
(SPB-ISIS) to share network in Link State, network each nodal parallel calculates and the shortest path between other each nodes
Footpath, the deficiency that the unstability brought using Spanning-Tree Protocol (STP) and part of links utilization ratio can be avoided low.
IEEE802.1aq defines two kinds of SPB patterns：(SPB of VLAN patterns is simple for VLAN (VLAN) regional model
Claim SPBV) (M-in-M) pattern (the SPB abbreviation SPBM of M-in-M patterns) nested with MAC.
Referring to Fig. 1, Fig. 1 is prior art SPBM networking schematic diagram, and user network passes through backbone edges bridge
(Backbone Edge Bridge, BEB) is connected to backbone network, passes through backbone network core net between BEB in backbone network
Bridge (Backbone Core Bridge, BCB) is connected.Wherein, BEB is responsible for that M-in-M envelopes will be carried out from the message of user network
Dress, and be forwarded in backbone network；Or will be decapsulated from the M-in-M messages of backbone network, and it is forwarded to user network
In network.BCB is responsible for turning according to backbone network medium access control (Backbone MAC, B-MAC) and backbone network VLAN (B-VLAN)
Send out M-in-M messages.
SPBM supports many examples, and each SPBM example represents a class business or user, with only numbering：Backbone network
Service Instance numbers (Backbone Service Instance Identifier, I-SID), and is carried on a B-VLAN
In.The flow forwarding of different SPBM examples is completely isolated.
Referring to Fig. 2, Fig. 2 is the SPBM example schematics based on Fig. 1, three defined in SPBM networkings shown in Fig. 1
SPBM examples.Wherein, SPBM examples 1 carry the flow of I-SID 300, and SPBM examples 2 carry the flow of I-SID 400,
SPBM examples 3 carry the flow of I-SID 500.I-SID 300, I-SID 400 and I-SID 500 flow forwarding completely every
From.
In SPBM network, using ECT (Equal Cost Tree, equivalent tree) algorithm load balancing, different ECT are realized
Algorithm can go out different SPT (Shortest Path Tree, shortest path tree) with decision-making, one forwarding road of each SPT correspondence
Footpath, flow can carry out load balancing in different SPT.SPB only supports at present 16 kinds of ECT algorithms, therefore in same SPBM
Can only at most there are 16 forward-paths.
In existing realization, there are mapping relations between ECT algorithms and B-VLAN, one group of B-VLAN is mapped to into same ECT and is calculated
Method, the flow of follow-up this group of B-VLAN is all forwarded in the SPT of the ECT algorithm decision-makings.For example in FIG, ECT algorithms 1
Decision-making goes out SPT1, and the decision-making of ECT algorithms 2 goes out SPT2, then can will carry the B_VLAN of I-SID 300 and carry the B- of I-SID400
VLAN is mapped to ECT algorithms 1, and the B_VLAN for carrying I-SID500 is mapped to into ECT algorithms 2, I-SID 300 and I-SID 400
Flow will forward along SPT1, the flow of I-SID 500 will be forwarded along SPT2.
As can be seen that at present SPBM only realizes the flow load sharing between different I-SID, and the flow of same I-SID
Load balancing cannot be carried out using ECT algorithms, i.e., the flow of same Service Instance cannot carry out load balancing.
The content of the invention
In view of this, the purpose of the application is to provide a kind of load balancing implementation method and device, it is possible to achieve flow
Load balancing in same Service Instance.
For achieving the above object, the technical scheme of the application offer is：
A kind of load balancing implementation method, is applied in the shortest path bridging SPBM network of M-in-M patterns key selvage
Arbitrary Service Instance on edge bridge BEB, the method includes：
Receive the message for belonging to the Service Instance from user network；
A derivative I-SID is selected from the corresponding multiple derivative I-SID of the Service Instance, according to the derivative I- for selecting
The corresponding forwarding-table items of SID E-Packet；
Wherein, the plurality of derivative I-SID is associated with the I-SID of the Service Instance, and each derivative I-SID corresponds to one
B-VLAN and the forwarding-table item determined according to the ECT algorithms of the B-VLAN mappings.
A kind of load balancing realizes device, and the arbitrary Service Instance being applied in SPBM network on BEB, the device includes：
Receiving unit, control unit, transmitting element；
The receiving unit, for receiving the message for belonging to the Service Instance from user network；
Described control unit, for receiving unit the message for belonging to the Service Instance from user network is received,
A derivative I-SID is selected from the corresponding multiple derivative I-SID of the Service Instance；
The transmitting element, the corresponding forwarding-table items of derivative I-SID for being selected according to control unit E-Packet；
Wherein, the plurality of derivative I-SID is associated with the I-SID of the Service Instance, and each derivative I-SID corresponds to one
B-VLAN and the forwarding-table item determined according to the ECT algorithms of the B-VLAN mappings.
In sum, in the application, when BEB equipment receives the message for belonging to a certain Service Instance from user network
When, by selecting to derive a derivative I-SID in the corresponding multiple derivative I-SID of the Service Instance, and using the selection
The corresponding forwarding-table item of derivative I-SID carries out message forwarding, so that flow can be in each derivative I-SID of same I-SID
Between carry out load balancing.
Description of the drawings
Fig. 1 is prior art SPBM networking schematic diagram；
Fig. 2 is SPBM example schematic of the prior art based on Fig. 1；
Fig. 3 is the derivative I-SID form schematic diagrams of the embodiment of the present application；
Fig. 4 is that the embodiment of the present application SPBM Ramification Service ISID-ADDR sub-TLV forms are illustrated
Figure；
Fig. 5 is the schematic flow sheet of the embodiment of the present application load sharing method；
Fig. 6 is the structural representation of the embodiment of the present application load balancing device.
Specific embodiment
Purpose, technical scheme and advantage to make the application becomes more apparent, and develop simultaneously referring to the drawings embodiment, right
Herein described scheme is described in further detail.
Can be that the Service Instance in SPBM network is generated or configures multiple derivative I-SID in the application, so, when
BEB equipment receive from user network belong to same Service Instance message when, by corresponding many in the Service Instance
A derivative I-SID is selected in individual derivative I-SID, and message forwarding is carried out using the corresponding forwarding-table items of the derivative I-SID, can
To realize load balancing of the flow in the same Service Instance.
Below principle is described in detail to be realized to the embodiment of the present application load balancing：
I-SID for Service Instance generates or configures derivative I-SID：
In existing realization, I-SID takes 3 bytes (bytes), and span is 0-16777215.
In the embodiment of the present application, the length of I-SID is extended, for example, expands to 3.5 bytes, 4 bytes etc., its Central Plains
The original I-SID of 3 byte representations having, the byte of newly-increased/extension is referred to as I-SID-Plus, I-SID-Plus and original I-SID
Derivative I-SID is collectively formed, such as the derivative I-SID form schematic diagrams shown in Fig. 3, wherein the 1st byte representation I-SID-
Plus, the original I-SID of 2-4 byte representations.
The number upper limit of the derivative I-SID for generating for I-SID or configuring can determine according to ECT algorithms number, by
16 kinds are had in current ECT algorithms, therefore, it can at most generate 16 derivative I-SID for I-SID, each derivative I-SID point
One kind that Dui Ying be in 16 kinds of ECT algorithms.It is of course also possible to generate be less than 16 derivative I-SID for an I-SID.And, such as
Fruit ECT algorithms increase, and can generate the derivative I-SID numbers upper limit to increase with the increase of ECT algorithm numbers, or,
Can be according to specific network environment, or message transmissions amount determines the appropriate number of derivative I-SID of setting.
Distribute corresponding B_VLAN for derivative I-SID：
Generate for I-SID or configure after derivative I-SID, in addition it is also necessary to distribute corresponding B-VLAN for each derivative I-SID, these
B-VLAN can be continuous, or discontinuous.Derivative I-SID (only being represented with I-SID-Plus) and B-VLAN's is right
Should be related to can be as shown in Table 1：
| I-SID-Plus (16 system) | B-VLAN |
| 0 | 1st B-VLAN |
| 1 | 2nd B-VLAN |
| 2 | 3rd B-VLAN |
| 3 | 4th B-VLAN |
| 4 | 5th B-VLAN |
| 5 | 6th B-VLAN |
| 6 | 7th B-VLAN |
| 7 | 8th B-VLAN |
| 8 | 9th B-VLAN |
| 9 | 10th B-VLAN |
| A | 11st B-VLAN |
| B | 12nd B-VLAN |
| C | 13rd B-VLAN |
| D | 14th B-VLAN |
| E | 15th B-VLAN |
| F | 16th B-VLAN |
Table one
In actual applications, it is available for the B-VLAN numbers for distributing to derivative I-SID to need according to network topology size and sky
Not busy B-VLAN numbers can be an empirical value (can be empirically determined by manager) determining.And derivative I-SID and B-VLAN it
Between corresponding relation can be random or specify.
Wherein, can be multiple when being available for distributing to the B-VLAN numbers of derivative I-SID less than derivative I-SID numbers
Derivative I-SID distributes same B-VLAN, for example, be a certain I-SID generate be derivatized with 16, only 15 B-VLAN are available for point
Match somebody with somebody, at this moment, same B-VLAN can be distributed for two therein derivative I-SID, other each derivative I-SID then each distribute not
Same B-VLAN.When being available for the B-VLAN numbers for distributing to derivative I-SID to be equal to or more than derivative I-SID numbers, can be for not
With derivative I-SID distribution difference B-VLAN.
Derivative I-SID is generated or configured for I-SID, and is distributed after corresponding B-VLAN for each derivative I-SID, in addition it is also necessary to
The B-VLAN is mapped to into specific ECT algorithms, with SPTs of each derivative I-SID of decision-making under each self-corresponding B-VLAN.It is different
B-VLAN need to be mapped to different ECT algorithms, so that decision-making goes out different SPT.When each derivative I-SID for same I-SID distributes
Corresponding B-VLAN, and the corresponding B-VLAN of each derivative I-SID is mapped to after different ECT algorithms, can basis
The ECT algorithm decision-makings of the corresponding B-VLAN mappings of each derivative I-SID go out the corresponding SPT of the derivative I-SID, and then derivative according to this
The corresponding SPT of I-SID generate forwarding-table items of the derivative I-SID under correspondence B-VLAN.Similarly, the corresponding ECT of B-VLAN
Algorithm can also be random or be specified.
So, when BEB equipment receive from user network belong to the I-SID message after, it is possible to select the I-
A derivative I-SID in the corresponding multiple derivative I-SID of SID, and according to the derivative I-SID for selecting under corresponding B-VLAN
Forwarding-table item E-Packet.Wherein, selecting the method for derivative I-SID can adopt various sides such as Hash (hash) or poll
Formula.The corresponding relation of interface and I-SID can be provided with BEB equipment in advance, when the message from user network is received, can root
The corresponding I-SID of message receiving interface is searched according to the corresponding relation in the interface and I-SID, the I-SID is defined as into message
Affiliated I-SID, the Service Instance representated by the I-SID is exactly the Service Instance belonging to message.
Forwarding-table items of the above-mentioned derivative I-SID under correspondence B-VLAN includes virtual circuit (PW) list item and forwarding database
(FDB) list item, wherein, PW list items are used to accessing and encapsulating user network side message, including I-SID, B-MAC, B-VLAN, Link
The information such as ID, outgoing interface；FDB be used for forwarding according to PW list items encapsulation after M-in-M messages, including B-MAC, B-VLAN, go out end
The information such as mouth.For BEB equipment, when receiving the message for belonging to a certain Service Instance from user network, and from this
Have selected after a derivative I-SID in the corresponding multiple derivative I-SID of Service Instance, can be corresponding according to the derivative I-SID
PW list items carry out message encapsulation and forwarding, and the BCB equipment or BEB equipment for receiving the message after encapsulation then needs to be derived according to this
The corresponding FDB list items forwardings of I-SID.
In prior art, when BEB equipment receives the M-in-M messages in backbone network, need according to PW list items
(Link ID are included in PW list items) is decapsulated and is carried out in decapsulation process client's net MAC Address to M-in-M messages
(CMAC) learn, also will M-in-M messages client's net source MAC (C-SA) study (use to corresponding PW logic interfaces
Link ID are represented), obtain CMAC list items (CMAC list items include the information such as client mac address, Link ID).And work as BEB
Equipment from user network side joint to receive client's net target MAC (Media Access Control) address (C-DA) be the message of the C-SA when, it is possible to find this
CMAC list items, then the Link ID in the CMAC list items determine corresponding PW list items and FDB list items, with that can be with root
M-in-M encapsulation is carried out according to PW list items and according to the M-in-M messages obtained after the forwarding encapsulation of FDB list items.
In the embodiment of the present application, when BEB equipment receives the M-in-M messages in backbone network, equally also need
CMAC study is decapsulated and be carried out in decapsulation process to M-in-M messages according to PW list items, due to being in derivative I-
Forwarded in the corresponding SPT of SID, therefore, what is learnt is associated with the CMAC list items of derivative I-SID.
In addition, when BEB equipment receives M-in-M messages and learns to the CMAC list items for being associated with a certain derivative I-SID,
Can with generated according to the CMAC list items that learn be associated with the derivative I-SID belong to I-SID other are each derivative
The CMAC list items of I-SID, in implementing, can respectively be substituted for other each by the Link ID in the CMAC list items for learning
Link ID in the corresponding PW list items of derivative I-SID.So, BEB equipment is received after the message of user network, if
Client's net target MAC (Media Access Control) address of message is the client's net MAC Address in the CMAC list items, then no matter select which derivative I-SID,
Corresponding CMAC list items are then found, and then can be carried out according to the corresponding PW list items of CMAC list items and FDB list items that find
The M-in-M encapsulation of message and forwarding.
In actual applications, it is contemplated that the real-time change of flow, when the corresponding flows of an I-SID are less, and need not
Load balancing is carried out using too many SPT, therefore, it can consider to arrange the derivative I-SID for coming into force according to uninterrupted, only used
The corresponding SPT of derivative I-SID for coming into force carry out load balancing.And be not configured to effectively derive the corresponding forward tables of I-SID
Xiang Ze will be deleted from hardware driving, only retain list item information on upper strata, to reduce resource occupation.
Because the corresponding flows of I-SID are that Jing often changes, if according in the regular additions and deletions hardware driving of changes in flow rate
List item, then can to flow forwarding stability can produce certain impact.Therefore, can be specified in the embodiment of the present application
The derivative I-SID of one or more of I-SID is the derivative I-SID for forever coming into force, then the derivative I-SID that these forever come into force is necessary
Used as load balancing optionies, corresponding forwarding-table item must be remained stored in hardware driving and will not be deleted.Flow compared with
In the case of little, only load balancing can be carried out using the SPT of the derivative I-SID for forever coming into force, only when flow exceedes setting
Flow threshold values when, some derivative I-SID are just selected from the derivative I-SID for being not configured to forever come into force, these are derived
I-SID is set to temporarily come into force, and the list item of these derivative I-SID for temporarily coming into force is issued to into hardware driving, to make these
The derivative I-SID for temporarily coming into force and the derivative I-SID that forever comes into force carry out correspondence I-SID together as load balancing optionies
Flow load sharing.
It is each flow interval correspondence one for this purpose, uninterrupted can be divided into into multiple flow intervals
Temporarily come into force derivative I-SID numbers, so as to form flow interval and the derivative I-SID numbers synopsis that temporarily comes into force, it is assumed that
The derivative I-SID of a certain I-SID has 16, wherein the derivative I-SID for being arranged to forever come into force has 5, then flow value
It is interval and temporarily come into force derivative I-SID numbers synopsis can be as shown in Table 3：
| Flow interval (in units of the Mbytes/ seconds) | Temporarily come into force derivative I-SID numbers |
| 0-10 | 0 |
| 10-100 | 5 |
| More than 100 | 11 |
Table three
As can be seen from Table III, when the flow of I-SID changes between 0 to 10Mbytes/ second, only use and forever come into force
Derivative I-SID carry out the load balancing of flow, it is not necessary to the derivative I-SID that setting temporarily comes into force.When flow is in 10Mbytes/
When s to the 100Mbytes/ seconds change, need to select 5 derivative I-SID from the derivative I-SID for being not configured to forever come into force,
This 5 derivative I-SID are set to temporarily come into force, and the corresponding list items of derivative I-SID that this 5 are temporarily come into force are issued to
Hardware driving, to carry out traffic sharing with the 5 derivative I-SID for forever coming into force.When flow is more than the 100Mbytes/ seconds, need
11 derivative I-SID are selected from the derivative I-SID for being not configured to forever come into force, this 11 derivative I-SID are set to
Temporarily come into force, and the corresponding list items of derivative I-SID that this 11 are temporarily come into force are issued to hardware driving, so as to raw with permanent
5 derivative I-SID of effect carry out traffic sharing.
In order to avoid the derivative I-SID configurations for forever coming into force of a certain I-SID are inconsistent, can also enter between BEB equipment
The derivative I-SID that row forever comes into force consults.In implementing, BEB equipment specify in the I-SID of a certain Service Instance or
Multiple derivative I-SID are after the derivative I-SID for forever coming into force, can to perform following operation：
Own all derivative I-SID information announcements of the I-SID in this BEB equipment to other for carrying the Service Instance
BEB equipment, and receive all derivative I-SID information for belonging to the Service Instance of other all BEB equipment notices；
Then, set according to all derivative I-SID information and other all BEB for belonging to the Service Instance in this BEB equipment
The all derivative I-SID information for belonging to the Service Instance of standby notice determines the derivative I-SID for forever coming into force；Wherein, it is described to spread out
Raw I-SID information includes derivative I-SID, active states；The active states include：Forever come into force, temporarily come into force, it is invalid；
Then, compare and be defined as the derivative I-SID set S1 for forever coming into force and the derivative I-SID collection for being appointed as forever coming into force
S2 is closed, if S1 includes S2, all derivative I-SID in the difference set of S1 and S2 is also configured as forever coming into force；If S1 etc.
In S2, then the permanent active states of all derivative I-SID in S2 are kept；If S2 includes S1, by the difference set of S2 and S1
The cancellation that forever comes into force of all derivative I-SID, it is invalid to be rearranged into.
Wherein, it is all derivative with other all BEB equipment notices according to all derivative I-SID information of this BEB equipment
I-SID information determines that the method for the derivative I-SID for forever coming into force has at least following two：
(1) the derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into intersection operation,
The derivative I-SID that all derivative I-SID in intersection operation result is defined as forever coming into force；
(2) the derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into union operation,
The derivative I-SID that all derivative I-SID in union operation result is defined as forever coming into force.
By taking the method for the derivative I-SID that the first determination forever comes into force as an example, it is assumed that the stream of I-SID is carried in SPBM network
The BEB equipment of amount includes：Device A and equipment B, device A specifies derivative I-SID1 and derivative I-SID2 forever to come into force, equipment B
Specify derivative I-SID1 and derivative I-SID3 forever to come into force, then device A and equipment B are noticed mutually after derivative I-SID information,
Derivative I-SID to forever coming into force in two equipment carries out intersection operation and determines that the derivative I-SID for forever coming into force is derivative I-
SID1.Therefore, device A cancels the permanent active states of derivative I-SID2, and it is invalid that derivative I-SID2 is set to；Equipment B cancels
The permanent active states of derivative I-SID3, it is invalid that derivative I-SID3 is set to.
By taking the method for the derivative I-SID that the first determination forever comes into force as an example, it is assumed that the stream of I-SID is carried in SPBM network
The BEB equipment of amount includes：Device A and equipment B, device A specifies derivative I-SID1 and derivative I-SID2 forever to come into force, equipment B
Specify derivative I-SID1 and derivative I-SID3 forever to come into force, then device A and equipment B are noticed mutually after derivative I-SID information,
Derivative I-SID to forever coming into force in two equipment carries out intersection operation and determines that the derivative I-SID for forever coming into force is derivative I-
SID1, derivative I-SID2 and derivative I-SID3.Therefore, device A needs forever to be come into force what derivative I-SID3 was set to, so sets
The derivative I-SID forever come into force in standby A just includes derivative I-SID1, derivative I-SID2 and derivative I-SID3；Equipment B needs to spread out
Raw I-SID2 is set to forever come into force, and the derivative I-SID forever come into force in such equipment B also includes derivative I-SID1, derivative I-
SID2 and derivative I-SID3.
In actual applications, in order to avoid flowed fluctuation it is larger when, perform repeatedly derivative I-SID temporarily come into force with it is invalid
Arrange, in addition it is also necessary to the persistency of changes in flow rate is considered, when the corresponding changes in flow rate of I-SID causes flow value place flow value area
Between change after, if flow (preset duration) within a period of time is always held at the flow interval after changing, now
The temporary transient life of derivative I-SID just can be carried out according to the corresponding derivative I-SID numbers that temporarily come into force of the flow interval after change
Effect or invalid setting, if flow becomes original flow interval again quickly, need not perform the temporary transient of derivative I-SID
Come into force or invalid setting.
When the number of variations of the derivative I-SID for temporarily coming into force of I-SID, for the derivative I-SID of change, need to notify
To other all devices in SPBM network, so that other all devices know this change and to corresponding derivative I-SID phases
Pass information performs corresponding modification, to be consistent come into force derivative I-SIDs of the I-SID in whole SPBM network.Its
In,
When changes in flow rate results in the need for being arranged to the derivative I-SID numbers that temporarily come into force to be increased, it may be determined that need new
The derivative I-SID numbers for increasing, the derivative I-SID of corresponding number are then selected from unenforced derivative I-SID and are set to temporarily
Shi Youxiao, while also need to the derivative I-SID that selects these notifying to its in SPBM network as the derivative I-SID that waits to come into force
Its all devices, so that waiting of the receiving derivative I-SID that comes into force is set to temporarily come into force by other each equipment.
When changes in flow rate results in the need for the derivative I-SID numbers reduction for being arranged to temporarily come into force, it may be determined that needs subtract
Few derivative I-SID numbers, then select the derivative I-SID of corresponding number from the derivative I-SID for being arranged to temporarily come into force
And be set to it is invalid, while the derivative I-SID for also needing to select these is notified to SPBM network as derivative I-SID to be invalidated
In other all devices, so as to other each equipment the to be invalidated derivative I-SID for receiving is set to it is invalid.
LSP messages can be utilized to carry out waiting coming into force the notice of derivative I-SID and derivative I-SID to be invalidated, by reporting in LSP
Increase a SPBM Ramification Service ISID-ADDR sub-TLV in text newly, form is as shown in figure 4, can see
Go out, newly-increased sub-TLV is identical with the form of original SPBM Service ISID-ADDR sub-TLV, and difference exists
In：I-SID in original SPBM Service ISID-ADDR sub-TLV is 3 bytes, and SPBM Ramification
I-SID in Service ISID-ADDR sub-TLV takes 4 bytes.When carrying out derivative I-SID and notifying, can by by
The derivative I-SID for being set to temporarily come into force is carried in LSP messages, receives the equipment of the LSP messages according in this equipment
It is to need spreading out for modification state to have been set to dispose the derivative I-SID carried in the derivative I-SID and LSP messages for coming into force to determine
Give birth to I-SID and need for these derivative I-SID to be set to invalid or temporary transient effective status.
Above load balancing of the flow in same I-SID is realized by generating derivative I-SID for I-SID to the application
Principle has been described in detail, and is illustrated based on principles above, this application provides a kind of load sharing method and a kind of load
Sharing device, illustrates separately below with reference to Fig. 5, Fig. 6.
Referring to Fig. 5, Fig. 5 is the schematic flow sheet of the embodiment of the present application load sharing method, and the method is applied to SPBM nets
Arbitrary Service Instance in network on BEB equipment, mainly includes the following steps that：
Step 501, receive from user network the message for belonging to the Service Instance.
Can determine what is received with the relation of Service Instance and the interface of reception message according to the interface being pre-configured with
Service Instance belonging to message, it is of course also possible to use other methods of prior art determine Service Instance described in message.
Step 502, from the corresponding multiple derivative I-SID of the Service Instance select a derivative I-SID, according to selection
The corresponding forwarding-table items of derivative I-SID E-Packet.
In this step, the plurality of derivative I-SID is associated with the I-SID of the Service Instance, each derivative I-SID correspondence
The forwarding-table item determined in a B-VLAN and according to the ECT algorithms of the B-VLAN mappings.
The embodiment of the present application also includes shown in Fig. 5：
In advance the I-SID for the Service Instance configures or generates multiple derivative I-SID；
Distribute corresponding B-VLAN for each derivative I-SID, the B-VLAN is mapped to into different ECT algorithms, according to this
The corresponding SPT of the ECT algorithms decision-making of the corresponding B-VLAN mappings of the derivative I-SID derivative I-SID, and according to the derivative I-SID
Corresponding SPT generates the corresponding forwarding-table items of the derivative I-SID.
The embodiment of the present application is further included shown in Fig. 5：
Receive from the M-in-M messages of the arbitrary derivative I-SID for belonging to the Service Instance of backbone network when, will
M-in-M messages decapsulate and learn the receiving interface of client's net source MAC of M-in-M messages to M-in-M messages, according to
Learning outcome generates respectively the CMAC of the corresponding each derivative I-SID for being associated with the Service Instance of client's net source MAC
List item, by the message after decapsulation user network is forwarded to.
In the embodiment of the present application shown in Fig. 5,
It is described to be according to the method that E-Packets of the corresponding forwarding-table items of derivative I-SID for selecting：
It is corresponding if there is the corresponding derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
CMAC list items, determine the corresponding forwarding-table item of CMAC list items, M-in-M encapsulation is carried out to message according to the forwarding-table item and is turned
Send out；
It is corresponding if there is no the corresponding derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
CMAC list items, then by message with multicast mode along the corresponding SPT forwardings of the derivative I-SID.
The embodiment of the present application is further included shown in Fig. 5：
The derivative I-SID of at least one of the plurality of derivative I-SID are appointed as in advance the derivative I- for forever coming into force
SID, and it is more big according to flow, and the bigger principle of the derivative I-SID numbers that temporarily come into force arranges flow interval and temporarily comes into force
Derivative I-SID numbers synopsis；
When the flow value place flow interval of the Service Instance changes, compare and be currently set as temporarily coming into force
Derivative I-SID numbers CurTempNum and the corresponding temporary transient life of Service Instance present flow rate value place flow interval
The size of derivative I-SID number Ns extTempNum of effect：
If CurTempNum is less than NextTempNum, the difference of NextTempNum and CurTempNum, base are calculated
Pending The Entry Into Force is selected to derive I-SID from the plurality of derivative I-SID in the difference, by the derivative I-SID of all Pending The Entry Into Forces for selecting
It is set to temporarily come into force, and notifies the derivative I-SID of all Pending The Entry Into Forces for selecting as the derivative I-SID that waits to come into force to SPBM network
In other all devices so that other all devices will be waited to come into force, derivative I-SID is set to temporarily come into force；
If CurTempNum is equal to NextTempNum, keep the derivative I-SID for temporarily coming into force constant；
If CurTempNum is more than NextTempNum, the difference of CurTempNum and NextTempNum, base are calculated
In the derivative I-SID that the difference selects temporarily to come into force from all derivative I-SID for being arranged to temporarily come into force, the institute that will be selected
To have that temporarily come into force derivative I-SID to be set to invalid, and using all derivative I-SID that temporarily come into force for selecting as derivative I- to be invalidated
SID is notified to other all devices in SPBM network, so that derivative I-SID to be invalidated is set to nothing by other all devices
Effect；
The method of one derivative I-SID of selection is in corresponding multiple derivative I-SID from the Service Instance：From institute
State the derivative I-SID for being arranged to forever come into force or temporarily come into force in multiple derivative I-SID and select a derivative I-SID.
The embodiment of the present application is further included shown in Fig. 5：
The corresponding forwarding-table items of derivative I-SID for coming into force are issued to into hardware driving, by unenforced derivative I-SID correspondences
Forwarding-table item delete from hardware driving.
Referring to Fig. 6, Fig. 6 is the structural representation of the embodiment of the present application load balancing device, is applied to BEB in SPBM network
On arbitrary Service Instance, the device includes：Receiving unit 601, control unit 602, transmitting element 603；Wherein,
Receiving unit 601, for receiving the message for belonging to the Service Instance from user network；
Control unit 602, for receiving unit 601 report for belonging to the Service Instance from user network is received
Text, selects a derivative I-SID from the corresponding multiple derivative I-SID of the Service Instance；
Transmitting element 603, the corresponding forwarding-table items of derivative I-SID for being selected according to control unit 602 E-Packet；
Wherein, the plurality of derivative I-SID is associated with the I-SID of the Service Instance, and each derivative I-SID corresponds to one
B-VLAN and the forwarding-table item determined according to the ECT algorithms of the B-VLAN mappings.
Fig. 6 shown devices also include dispensing unit 604 and list item signal generating unit 605；
The dispensing unit 604, for being in advance the I-SID configurations of the Service Instance or generating multiple derivative I-SID；
For distributing corresponding B-VLAN for each derivative I-SID, the B-VLAN is mapped to into different ECT algorithms；
The list item signal generating unit 605, for being determined according to the ECT algorithms of the corresponding B-VLAN mappings of each derivative I-SID
The corresponding SPT of the plan derivative I-SID, and the corresponding forward tables of the derivative I-SID are generated according to the corresponding SPT of the derivative I-SID
.
In Fig. 6 shown devices,
The receiving unit 601, is further used for：Receive and belong to the arbitrary of the Service Instance from backbone network
The M-in-M messages of derivative I-SID；
Described control unit 602, is further used for receiving unit 601 and receives to belong to the service from backbone network
During the M-in-M messages of the arbitrary derivative I-SID of example, M-in-M messages are decapsulated and are learnt client's net of M-in-M messages
Source MAC generates respectively the corresponding pass of client's net source MAC to the receiving interface of M-in-M messages according to learning outcome
The CMAC list items of each derivative I-SID of the Service Instance are coupled to, indicate that transmitting element 603 is forwarded to the message after decapsulation
User network.
In Fig. 6 shown devices,
The transmitting element 603 E-Packets in the corresponding forwarding-table items of derivative I-SID selected according to control unit 602
When, it is used for：
It is corresponding if there is the corresponding derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
CMAC list items, determine the corresponding forwarding-table item of CMAC list items, M-in-M encapsulation is carried out to message according to the forwarding-table item and is turned
Send out；
It is corresponding if there is no the corresponding derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
CMAC list items, then by message with multicast mode along the corresponding SPT forwardings of the derivative I-SID.
Fig. 6 shown devices also include dispensing unit 604 and detector unit 606；
The dispensing unit 604, is used for：The derivative I-SID of at least one of the plurality of derivative I-SID are specified in advance
For the derivative I-SID for forever coming into force and more big according to flow, the bigger principle of the derivative I-SID numbers that temporarily come into force arranges flow
Interval and the derivative I-SID numbers synopsis that temporarily comes into force；
The detector unit 606, for measuring the present flow rate of the Service Instance；
Described control unit 602, is further used for the flow value place flow interval change when the Service Instance
And when new flow interval keeps preset duration, compare the derivative I-SID numbers for being currently set as temporarily coming into force
CurTempNum and the corresponding derivative I-SID numbers that temporarily come into force of Service Instance present flow rate value place flow interval
The size of NextTempNum：If CurTempNum is less than NextTempNum, NextTempNum and CurTempNum is calculated
Difference, select Pending The Entry Into Force to derive I-SID from the plurality of derivative I-SID based on the difference, will select all Pending The Entry Into Forces
Derivative I-SID is set to temporarily come into force, and indicates transmitting element 603 using the derivative I-SID of all Pending The Entry Into Forces for selecting as to be generated
The derivative I-SID of effect notified to other all devices in SPBM network, so that other all devices will be waited to come into force, derivative I-SID sets
It is set to and temporarily comes into force；If CurTempNum is equal to NextTempNum, keep the derivative I-SID for temporarily coming into force constant；If
CurTempNum is more than NextTempNum, then the difference of CurTempNum and NextTempNum is calculated, based on the difference from quilt
The derivative I-SID for selecting temporarily to come into force is set in all derivative I-SID for temporarily coming into force, all temporarily the coming into force for selecting is spread out
It is invalid that raw I-SID is set to, and indicates that transmitting element 603 spreads out all derivative I-SID that temporarily come into force for selecting as to be invalidated
Raw I-SID is notified to other all devices in SPBM network, so that other all devices are set to derivative I-SID to be invalidated
It is invalid；
Described control unit 602 selects a derivative I-SID from the corresponding multiple derivative I-SID of the Service Instance
When, it is used for：It is arranged to select one in the derivative I-SID for forever coming into force or temporarily coming into force from the plurality of derivative I-SID
Derivative I-SID.
In Fig. 6 shown devices,
The transmitting element 603, is further used for：In dispensing unit 604 by least in the plurality of derivative I-SID
Individual derivative I-SID is appointed as after the derivative I-SID for forever coming into force, and by the plurality of derivative I-SID information announcements carrying institute is given
State other all BEB equipment of Service Instance；
The receiving unit 601, is further used for receiving the Service Instance that belongs to of other all BEB equipment notices
All derivative I-SID information；
Described control unit 602, is further used for according to all derivative I- for belonging to the Service Instance in this BEB equipment
The all derivative I-SID information determination for belonging to the Service Instance of SID information and other all BEB equipment notices forever comes into force
Derivative I-SID；Comparison is defined as the derivative I-SID set S1 for forever coming into force and the derivative I-SID collection for being appointed as forever coming into force
S2 is closed, if S1 includes S2, all derivative I-SID in the difference set of S1 and S2 is also configured as forever coming into force；If S1 etc.
In S2, then the permanent active states of all derivative I-SID in S2 are kept；If S2 includes S1, by the difference set of S2 and S1
The cancellation that forever comes into force of all derivative I-SID, it is invalid to be rearranged into；
Wherein, the derivative I-SID information includes derivative I-SID, active states；The active states include：It is permanent raw
Imitate, temporarily come into force, it is invalid.
In Fig. 6 shown devices,
Described control unit 602 is led in all derivative I-SID information according to this BEB equipment and other all BEB equipment
When all derivative I-SID information accused determines the derivative I-SID for forever coming into force, it is used for：
The derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into intersection operation, will be handed over
All derivative I-SID in set operation result is defined as the derivative I-SID for forever coming into force；
Or,
The derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into union operation, will simultaneously
All derivative I-SID in set operation result is defined as the derivative I-SID for forever coming into force.
In Fig. 6 shown devices,
Described control unit 602, the corresponding forwarding-table items of derivative I-SID for being further used for coming into force are issued to hardware drive
It is dynamic, the corresponding forwarding-table items of unenforced derivative I-SID are deleted from hardware driving.
The above, the only preferred embodiment of the application is not intended to limit the protection domain of the application.It is all
Within spirit herein and principle, any modification, equivalent substitution and improvements made etc. should be included in the protection of the application
Within the scope of.
Claims (16)
1. a kind of load sharing method, is applied to backbone edges bridge in the shortest path bridging SPBM network of M-in-M patterns
Arbitrary Service Instance on BEB, it is characterised in that the method includes：
Receive the message for belonging to the Service Instance from user network；
A derivative I-SID is selected from the corresponding multiple derivative I-SID of the Service Instance, according to the derivative I-SID for selecting
Corresponding forwarding-table item E-Packets；
Wherein, the plurality of derivative I-SID is associated with the I-SID of the Service Instance, and each derivative I-SID corresponds to a B-
VLAN and the forwarding-table item determined according to the ECT algorithms of the B-VLAN mappings.
2. method according to claim 1, it is characterised in that the method also includes：
In advance the I-SID for the Service Instance configures or generates multiple derivative I-SID；
Distribute corresponding B-VLAN for each derivative I-SID, the B-VLAN is mapped to into different ECT algorithms, it is derivative according to this
The corresponding SPT of the ECT algorithms decision-making of the I-SID corresponding B-VLAN mappings derivative I-SID, and according to derivative I-SID correspondences
SPT generate the corresponding forwarding-table items of the derivative I-SID.
3. method according to claim 1, it is characterised in that the method is further included：
Receive from the M-in-M messages of the arbitrary derivative I-SID for belonging to the Service Instance of backbone network when, by M-in-
M messages decapsulate and learn the receiving interface of client's net source MAC of M-in-M messages to M-in-M messages, according to study knot
Fruit generates respectively the CMAC list items of the corresponding each derivative I-SID for being associated with the Service Instance of client's net source MAC, will
Message after decapsulation is forwarded to user network.
4. method according to claim 3, it is characterised in that
It is described to be according to the method that E-Packets of the corresponding forwarding-table items of derivative I-SID for selecting：
If there is the corresponding CMAC tables of the corresponding derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
, determine the corresponding forwarding-table item of CMAC list items, M-in-M encapsulation and forwarding are carried out to message according to the forwarding-table item；
If there is no the corresponding corresponding CMAC of derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
List item, then by message with multicast mode along the corresponding SPT forwardings of the derivative I-SID.
5. method according to claim 1, it is characterised in that
The derivative I-SID of at least one of the plurality of derivative I-SID are appointed as in advance the derivative I-SID for forever coming into force, and
More big according to flow, the bigger principle of the derivative I-SID numbers that temporarily come into force arranges flow interval and the derivative I- that temporarily comes into force
SID number synopsis；
When the flow value place flow interval of the Service Instance changes and keeps default in new flow interval
When long, compare the derivative I-SID numbers CurTempNum and the Service Instance present flow rate for being currently set as temporarily coming into force
The size of corresponding derivative I-SID number Ns extTempNum that temporarily come into force of value place flow interval：
If CurTempNum is less than NextTempNum, the difference of NextTempNum and CurTempNum is calculated, based on this
Difference selects Pending The Entry Into Force to derive I-SID from the plurality of derivative I-SID, and the derivative I-SID of all Pending The Entry Into Forces for selecting is arranged
Temporarily to come into force, and notify the derivative I-SID of all Pending The Entry Into Forces for selecting as the derivative I-SID that waits to come into force in SPBM network
Other all devices, so that other all devices will be waited to come into force, derivative I-SID is set to temporarily come into force；
If CurTempNum is equal to NextTempNum, keep the derivative I-SID for temporarily coming into force constant；
If CurTempNum is more than NextTempNum, the difference of CurTempNum and NextTempNum is calculated, based on this
Difference selects the derivative I-SID for temporarily coming into force from all derivative I-SID for being arranged to temporarily come into force, all temporary by what is selected
It is invalid that the derivative I-SID of Shi Shengxiao are set to, and using all derivative I-SID that temporarily come into force for selecting as derivative I-SID to be invalidated
Notify to other all devices in SPBM network so that other all devices derivative I-SID to be invalidated is set to it is invalid；
The method of one derivative I-SID of selection is in corresponding multiple derivative I-SID from the Service Instance：From described many
It is arranged to select a derivative I-SID in the derivative I-SID for forever coming into force or temporarily coming into force in individual derivative I-SID.
6. method according to claim 5, it is characterised in that
The derivative I-SID of at least one of the plurality of derivative I-SID are appointed as after the derivative I-SID for forever coming into force, are entered
One step includes：
The plurality of derivative I-SID information announcements are given and carries other all BEB equipment of the Service Instance, and receive other
The all derivative I-SID information for belonging to the Service Instance of all BEB equipment notices；
Noticed according to all derivative I-SID information for belonging to the Service Instance in this BEB equipment and other all BEB equipment
The all derivative I-SID information for belonging to the Service Instance determines the derivative I-SID for forever coming into force；
Comparison is defined as the derivative I-SID set S1 and derivative I-SID set S2 for being appointed as forever coming into force for forever coming into force, if
S1 includes S2, then be also configured as forever coming into force by all derivative I-SID in the difference set of S1 and S2；If S1 is equal to S2, protect
Hold the permanent active states of all derivative I-SID in S2；If S2 includes S1, by all derivative I- in the difference set of S2 and S1
The cancellation that forever comes into force of SID, it is invalid to be rearranged into；
Wherein, the derivative I-SID information includes derivative I-SID, active states；The active states include：Forever come into force, temporarily
It is Shi Shengxiao, invalid.
7. method according to claim 6, it is characterised in that
According to all derivative I-SID information and all derivative I-SID information of other all BEB equipment notices of this BEB equipment
It is determined that the method for the derivative I-SID for forever coming into force is：
The derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into intersection operation, by fortune of occuring simultaneously
The all derivative I-SID calculated in result is defined as the derivative I-SID for forever coming into force；
Or,
The derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into union operation, will simultaneously transporting something containerized
The all derivative I-SID calculated in result is defined as the derivative I-SID for forever coming into force.
8. the method according to the arbitrary claim of claim 5-7, it is characterised in that the method is further included：
The corresponding forwarding-table items of derivative I-SID for coming into force are issued to into hardware driving, by unenforced corresponding turn of derivative I-SID
Forwarding list item is deleted from hardware driving.
9. a kind of load balancing device, the arbitrary Service Instance being applied in SPBM network on BEB, it is characterised in that the device
Including：Receiving unit, control unit, transmitting element；
The receiving unit, for receiving the message for belonging to the Service Instance from user network；
Described control unit, receives the message for belonging to the Service Instance from user network, from institute for receiving unit
State one derivative I-SID of selection in the corresponding multiple derivative I-SID of Service Instance；
The transmitting element, the corresponding forwarding-table items of derivative I-SID for being selected according to control unit E-Packet；
Wherein, the plurality of derivative I-SID is associated with the I-SID of the Service Instance, and each derivative I-SID corresponds to a B-
VLAN and the forwarding-table item determined according to the ECT algorithms of the B-VLAN mappings.
10. device according to claim 9, it is characterised in that the device also includes dispensing unit and list item signal generating unit；
The dispensing unit, for being in advance the I-SID configurations of the Service Instance or generating multiple derivative I-SID；For for
Each derivative I-SID distributes corresponding B-VLAN, and the B-VLAN is mapped to into different ECT algorithms；
The list item signal generating unit, for this to derive according to the ECT algorithms decision-making of the corresponding B-VLAN mappings of each derivative I-SID
The corresponding SPT of I-SID, and the corresponding forwarding-table items of the derivative I-SID are generated according to the corresponding SPT of the derivative I-SID.
11. devices according to claim 10, it is characterised in that
The receiving unit, is further used for：Receive the arbitrary derivative I- for belonging to the Service Instance from backbone network
The M-in-M messages of SID；
Described control unit, is further used for receiving unit and receives to belong to the arbitrary of the Service Instance from backbone network
During the M-in-M messages of derivative I-SID, M-in-M messages are decapsulated and learn client's net source MAC of M-in-M messages and is arrived
The receiving interface of M-in-M messages, generates respectively this client's net source MAC is corresponding and be associated with the clothes according to learning outcome
The CMAC list items of each derivative I-SID of pragmatic example, indicate that the message after decapsulation is forwarded to user network by transmitting element.
12. devices according to claim 11, it is characterised in that
The transmitting element is used for when the corresponding forwarding-table items of derivative I-SID selected according to control unit E-Packet：
If there is the corresponding CMAC tables of the corresponding derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
, determine the corresponding forwarding-table item of CMAC list items, M-in-M encapsulation and forwarding are carried out to message according to the forwarding-table item；
If there is no the corresponding corresponding CMAC of derivative I-SID for being associated with the selection of client's net target MAC (Media Access Control) address of message
List item, then by message with multicast mode along the corresponding SPT forwardings of the derivative I-SID.
13. devices according to claim 9, it is characterised in that the device also includes dispensing unit and detector unit；
The dispensing unit, is used for：The derivative I-SID of at least one of the plurality of derivative I-SID are appointed as forever in advance
The derivative I-SID for coming into force, and it is more big according to flow, and the bigger principle of the derivative I-SID numbers that temporarily come into force arranges flow value area
Between with the derivative I-SID numbers synopsis that temporarily comes into force；
The detector unit, for measuring the present flow rate of the Service Instance；
Described control unit, is further used for when the flow value place flow interval of the Service Instance changes and new
When flow interval keeps preset duration, compare the derivative I-SID numbers CurTempNum for being currently set as temporarily coming into force
The derivative I-SID numbers that temporarily come into force corresponding with Service Instance present flow rate value place flow interval
The size of NextTempNum：If CurTempNum is less than NextTempNum, NextTempNum and CurTempNum is calculated
Difference, select Pending The Entry Into Force to derive I-SID from the plurality of derivative I-SID based on the difference, will select all Pending The Entry Into Forces
Derivative I-SID is set to temporarily come into force, and indicates that transmitting element spreads out the derivative I-SID of all Pending The Entry Into Forces for selecting as waiting to come into force
Raw I-SID notified to other all devices in SPBM network, so that other all devices will be waited to come into force, derivative I-SID is set to
Temporarily come into force；If CurTempNum is equal to NextTempNum, keep the derivative I-SID for temporarily coming into force constant；If
CurTempNum is more than NextTempNum, then the difference of CurTempNum and NextTempNum is calculated, based on the difference from quilt
The derivative I-SID for selecting temporarily to come into force is set in all derivative I-SID for temporarily coming into force, all temporarily the coming into force for selecting is spread out
It is invalid that raw I-SID is set to, and indicates transmitting element using all derivative I-SID that temporarily come into force for selecting as derivative I- to be invalidated
SID is notified to other all devices in SPBM network, so that derivative I-SID to be invalidated is set to nothing by other all devices
Effect；
When described control unit selects a derivative I-SID from the corresponding multiple derivative I-SID of the Service Instance, use
In：It is arranged to select a derivative I- in the derivative I-SID for forever coming into force or temporarily coming into force from the plurality of derivative I-SID
SID。
14. devices according to claim 13, it is characterised in that
The transmitting element, is further used for：At least one of the plurality of derivative I-SID is derived into I- in dispensing unit
SID is appointed as after the derivative I-SID for forever coming into force, and the plurality of derivative I-SID information announcements is real to the service is carried
Other all BEB equipment of example；
The receiving unit, all of the Service Instance that belong to for being further used for receiving other all BEB equipment notices spread out
Raw I-SID information；
Described control unit, is further used for according to all derivative I-SID information for belonging to the Service Instance in this BEB equipment
The all derivative I-SID information for belonging to the Service Instance noticed with other all BEB equipment determines that what is forever come into force derives
I-SID；Comparison is defined as the derivative I-SID set S1 and derivative I-SID set S2 for being appointed as forever coming into force for forever coming into force, such as
Fruit S1 includes S2, then be also configured as forever coming into force by all derivative I-SID in the difference set of S1 and S2；If S1 is equal to S2,
Keep the permanent active states of all derivative I-SID in S2；If S2 includes S1, will be all derivative in the difference set of S2 and S1
The cancellation that forever comes into force of I-SID, it is invalid to be rearranged into；
Wherein, the derivative I-SID information includes derivative I-SID, active states；The active states include：Forever come into force, temporarily
It is Shi Shengxiao, invalid.
15. devices according to claim 14, it is characterised in that
Described control unit is in owning that all derivative I-SID information according to this BEB equipment and other all BEB equipment are noticed
When derivative I-SID information determines the derivative I-SID for forever coming into force, it is used for：
The derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into intersection operation, by fortune of occuring simultaneously
The all derivative I-SID calculated in result is defined as the derivative I-SID for forever coming into force；
Or,
The derivative I-SID for forever coming into force for belonging to the Service Instance in all BEB equipment is carried out into union operation, will simultaneously transporting something containerized
The all derivative I-SID calculated in result is defined as the derivative I-SID for forever coming into force.
16. devices according to the arbitrary claim of claim 13-15, it is characterised in that：
Described control unit, the corresponding forwarding-table items of derivative I-SID for being further used for coming into force are issued to hardware driving, will not
The corresponding forwarding-table items of derivative I-SID for coming into force are deleted from hardware driving.
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