CN104092607A - Method and device for calculating forwarding path - Google Patents
Method and device for calculating forwarding path Download PDFInfo
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- CN104092607A CN104092607A CN201410328732.3A CN201410328732A CN104092607A CN 104092607 A CN104092607 A CN 104092607A CN 201410328732 A CN201410328732 A CN 201410328732A CN 104092607 A CN104092607 A CN 104092607A
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Abstract
The invention provides a method and device for calculating a forwarding path. The method and device are applied to SPBM network devices. The method comprises the steps that a neighbor message from a neighbor device is analyzed, and the neighborhood between a home terminal device and the neighbor device is maintained when path algorithm types corresponding to the same backbone network VLAN of the home terminal device and the neighbor device are not identical; when the same backbone network VLAN with different path algorithm types exists in the home terminal device and the neighbor device, in the process of calculating the forwarding path from the home terminal device to an opposite terminal device, all equivalent forwarding paths with the same path algorithm type as the backbone network VLAN on the home terminal device are screened; the forwarding path of the backbone network VLAN is calculated according to the screened equivalent forwarding paths. By the adoption of the technical scheme, the established SPBM neighborhood can be prevented from being affected in the process of maintaining or optimizing an SPBM network, so a corresponding instance consistent with the ECT algorithm and the B-VLAN can still forward flow normally.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the method and apparatus that calculates forward-path.
Background technology
SPB (Shortest Path Bridging, shortest path bridge) agreement is one of ethernet standard of IEEE802.1aq definition, STP (Spanning Tree Protocol, Spanning-Tree Protocol) further extension, be intended to build the clog-free double layer network of large flat.SPB agreement is passed through three layers of route technology IS-IS (Intermediate System-to-Intermediate System, Intermediate System-to-Intermediate System) mentality of designing introduce double layer network, the slow and part of links utilization ratio low deficiency of the convergence rate having avoided using STP to bring.
At present, the use of SPB agreement, mainly based on SPBM pattern, specifically adopts Mac-in-Mac packing forms.Fig. 1 shows the composition structure of SPBM network, comprising:
SPBM core network: in Fig. 1 by BEB (Backbone Edge Bridge, backbone network edge bridges) and BCB (Backbone Core Bridge, backbone network core bridges) SPBN (the Shortest Path Bridging Network of equipment composition, shortest path bridging net), complete the calculating of shortest path by SPB Intermediate System to Intermediate System example, to ensure SPBN loop free.From user's angle, SPBN is exactly two layers of switching network, can between different nodes, set up two layers of connection, and all network equipments in SPBN all require must configuration SPBM function.
User network (Customer network): to the double layer network with separate traffic function of SPBN network, conventionally by business administration control, mainly formed by main frame and switching equipment by one or many BEB equipment connections.
Wherein, the operation principle of SPBM network is: realize encapsulation and the transmission of data by MAC-in-MAC agreement, come the routing forwarding path of calculated data by SPB Intermediate System to Intermediate System.Particularly, SPB Intermediate System to Intermediate System between each BEB, BCB equipment by periodic advertisement hello packet to set up and to maintain neighborhood, after forming neighborhood, between equipment, spread LSP (Link State PDU, Link State Protocol Data Unit), on final all devices in SPBN, form identical LSDB (Link State Data Base, LSD).Each equipment uses SPF (Shortest Path First, SPF) algorithm, ECT (Equal Cost Tree, equivalent tree) algorithm etc. to generate the forward-path from own to other equipment on the basis of LSDB.Calculate after forward-path, SPB Intermediate System to Intermediate System can instruct sets up the tunnel of a MAC-in-MAC type and corresponding transmitting between BEB equipment, and follow-up data message sends in tunnel.
In correlation technique, the SPBM network equipment need to, by checking the following information in hello packet, if all meet corresponding condition, just allow to set up or safeguard SPBM neighborhood.
(1) NLPID (Network Layer Protocol Identifiers, the network layer protocol mark) value of noticing in hello packet is consistent;
(2) the link cost value of transmission hello packet is less than 16777215;
(3) in hello packet, in MCID (MST Configuration Identifier, multiple spanning tree configuration identifier) or auxiliary MCID, any one is consistent;
(4) in hello packet, carried corresponding relation between B-VLAN and the routing algorithm of SPBM flow consistent.
But, in the time safeguarding or optimize SPBM network, tend to relate to the corresponding relation between amendment B-VLAN and routing algorithm, but be difficult to consistent owing to revising the opportunity of corresponding relation on heterogeneous networks equipment, thereby it is inconsistent to cause originally having set up the corresponding relation configuring between the bridge equipment of neighborhood, causes cannot continuing to maintain neighborhood.
Therefore,, if safeguarded multiple B-VLAN on bridge equipment simultaneously, even if only changed the corresponding relation between arbitrary B-VLAN and routing algorithm, still can cause the flow of all B-VLAN all cannot continue to forward owing to cannot maintaining neighborhood.
Summary of the invention
In view of this, the invention provides a kind of new technical scheme, can be in the time safeguarding or optimize SPBM network, the SPBM neighborhood of avoiding impact to set up, makes still converting flow normally of the corresponding ECT algorithm example consistent with B-VLAN.
For achieving the above object, the invention provides technical scheme as follows:
According to a first aspect of the invention, propose a kind of method of calculating forward-path, be applied to the SPBM network equipment, having comprised:
Resolve from neighbours' message of neighbor device, in the time that routing algorithm type that in local device and neighbor device, identical backbone network VLAN is corresponding is incomplete same, maintain the neighborhood between local device and neighbor device;
The identical backbone network VLAN different with there is routing algorithm type in neighbor device when local device, while calculating the forward-path of local device arrival opposite equip., screen with this backbone network VLAN at the identical forward-path all of equal value of local device upper pathway algorithm types;
Fall into a trap and calculate the forward-path corresponding to described backbone network VLAN at the forward-path of equal value filtering out.
According to a second aspect of the invention, propose a kind of device that calculates forward-path, be applied to the SPBM network equipment, having comprised:
Maintain unit, for resolving the neighbours' message from neighbor device, and when analysis result be routing algorithm type that in local device and neighbor device, identical backbone network VLAN is corresponding when incomplete same, maintain the neighborhood between local device and neighbor device;
Screening unit, for there is with neighbor device the identical backbone network VLAN that routing algorithm type is different when local device, while calculating the forward-path of local device arrival opposite equip., screen with this backbone network VLAN at the identical forward-path all of equal value of local device upper pathway algorithm types;
Computing unit, for calculating the forward-path of described backbone network VLAN at the forward-path of equal value filtering out.
From above technical scheme, the present invention is by the process of maintenance or optimization SPBM network, maintain corresponding SPBM neighborhood, thereby avoid the SPBM neighborhood set up of impact, make still converting flow normally of the corresponding ECT algorithm example consistent with B-VLAN.
Brief description of the drawings
Fig. 1 shows the structural representation of SPBM network;
Fig. 2 shows the schematic diagram that carries out traffic forwarding between the BEB equipment in SPBM network;
Fig. 3 shows the schematic diagram that the configuration on the BEB equipment in SPBM network changes;
Fig. 4 shows according to the schematic flow diagram of the method for the calculating forward-path of an exemplary embodiment of the present invention;
Fig. 5 shows according to the schematic diagram that carries out traffic forwarding between the BEB equipment in the SPBM network of an exemplary embodiment of the present invention;
Fig. 6 shows according to the schematic diagram that carries out traffic forwarding between the BEB equipment in the SPBM network of another exemplary embodiment of the present invention;
Fig. 7 shows according to the schematic block diagram of the device of the calculating forward-path of an exemplary embodiment of the present invention.
Embodiment
Below taking the SPBM neighborhood between any two SPBM network equipments as example, maintenance in SPBM network or optimizing process are described, wherein can be in the SPBN network shown in Fig. 1 between any two BEB equipment of direct neighbor and BCB equipment or set up SPBM neighborhood between any two BCB equipment.As shown in Figure 2, suppose that SPBM network internal storage is BEB1 and BEB2, three equipment of the core network BCB1, BCB2 and BCB3 at two edge of table equipment, BEB1 sets up SPBM neighborhood with BCB1, BCB2 and BCB3 respectively, BCB1, BCB2 and BCB3 also set up SPBM neighborhood with BEB2 simultaneously, and between BEB1 and BEB2, having three equative routes, is respectively the forward-path A being made up of BEB1-BCB1-BEB2, the forward-path B being made up of BEB1-BCB2-BEB2 and the forward-path C that is made up of BEB1-BCB3-BEB2.
Suppose on the network equipment in each equative route and all adopt the configuration shown in Fig. 2 1., be that ID is that 3001 and 3002 B-VLAN is corresponding to routing algorithm ECT1 (taking ECT algorithm as example), ID is that 3003 and 3004 B-VLAN is corresponding to routing algorithm ECT2, ID is that 3005 and 3006 B-VLAN is corresponding to routing algorithm ECT3, in other words, as equipment B EB1, BEB2, BCB1, BCB2 and BCB3 are that any in B-VLAN3001～3006 is while calculating corresponding forward-path, all will adopt identical algorithm to calculate, such as selecting ECT1 for B-VLAN3001, for B-VLAN3004 selects ECT2 etc., identical to guarantee the selection that every network equipment makes, thereby can be by the identical path implement traffic forwarding calculating.
In the time that needs are safeguarded or optimize SPBM network, may need the corresponding relation between some B-VLAN and routing algorithm on the network equipment to adjust, and this adjustment need to be adjusted on the all-network equipment of this traffic flow warp, in the process that these network equipments are adjusted, to certainly exist and adjust the time difference, make between the adjustment process of heterogeneous networks equipment asynchronous.For example, ratio as shown in Figure 3, first the configuration on BEB1 is adjusted, 2. 1. configuration can be adjusted into configuration, be that ID is that 3006 routing algorithm corresponding to B-VLAN is changed to ECT2 by ECT3, and due to BCB1, 1. BCB2 and BCB3 still adopt configuration, BEB1 is being received from BCB1, BCB2, after the hello packet of BCB3, or BCB1, BCB2, BCB3 receives after the hello packet from BEB1, can be owing to not meeting " in hello packet, carried corresponding relation consistent " between B-VLAN and the routing algorithm of SPBM flow, remove BEB1 and BCB1, BCB2, neighborhood between BCB3, although routing algorithm corresponding to the B-VLAN that ID is 3001～3005 is at BEB1 and BCB1, BCB2, between BCB3, be consistent, still can cannot be at BEB1 and BCB1 due to the releasing of neighborhood, BCB2, between BCB3, realize normal traffic forwarding.
For the problems referred to above, the present invention is by the process of maintenance or optimization SPBM network, only detect the situation that meets for defined terms in background technology (1)～(3) from the information in the hello packet of neighbor device, and cancel the investigation for condition (4) " carried in hello packet corresponding relation consistent " between B-VLAN and the routing algorithm of SPBM flow, even if while making corresponding relation between B-VLAN and routing algorithm not quite identical, still can maintain corresponding SPBM neighborhood, thereby the SPBM neighborhood of avoiding impact to set up, make still converting flow normally of the corresponding ECT algorithm example consistent with B-VLAN.Particularly, Fig. 4 shows according to the method for the calculating forward-path of an exemplary embodiment of the present invention, comprising:
Step 102, resolves the neighbours' message from neighbor device, in the time that routing algorithm type corresponding to identical backbone network VLAN (being B-VLAN) in local device and neighbor device is incomplete same, maintains the neighborhood between local device and neighbor device;
In the present embodiment, set up between the local device of SPBM neighborhood and neighbor device and need to safeguard the corresponding relation between multiple B-VLAN and routing algorithm, in the time safeguarding or optimize corresponding SPBM network, if only revised the corresponding relation between part B-VLAN and routing algorithm wherein,, by maintaining the neighborhood between local device and neighbor device, flow corresponding to corresponding relation that other are not modified still can normally be forwarded.Wherein, neighbours' message that neighbor device sends can be SPBM hello packet.
Step 104, the identical backbone network VLAN different with there is routing algorithm type in neighbor device when local device, in the time calculating the forward-path of local device arrival opposite equip., screening is with this backbone network VLAN at the identical forward-path all of equal value of local device upper pathway algorithm types, and the routing algorithm type in all bridge equipments of this backbone network VLAN on this equivalence forward-path is all identical;
In the present embodiment, local device and neighbor device are the network equipments of direct neighbor in network topology, thereby can set up SPBM neighborhood between local device and neighbor device; Meanwhile, between local device and opposite equip., there is at least one other network equipment, thereby between local device and opposite equip., may have many forward-paths of equal value.Taking the network configuration shown in Fig. 3 as example, BEB1 has set up neighborhood with BCB1, BCB2 and BCB3 respectively, and BCB1, BCB2 and BCB3 have set up neighborhood with BEB2 simultaneously, suppose the forward-path of equal value that need to screen for B-VLAN3006 BEB1 to BEB2, the process of screening forward-path of equal value is as follows:
Suppose in forward-path A～forward-path C, such as only having, 2. 1. BEB1 is upper is adjusted into configuration by configuration, and 1. BEB2 and BCB1～BCB3 still adopt configuration, if based on the investigation for condition (1)～(4) in background technology, neighborhood between BEB1 and BCB1～BCB3 will disconnect, and cause the flow on all B-VLAN all cannot forward.And in technical scheme of the present invention, due to the investigation of having cancelled for condition (4), work as in the constant situation of other conditions, by the neighborhood maintaining between BEB1 and BCB1～BCB3, the flow that only B-VLAN3006 is corresponding temporarily cannot be forwarded, and the flow of all the other B-VLAN3001～3005 all can continue to forward.
Then, by amendment configuration on BEB2 and BCB1～BCB3, making all-network equipment at least one forward-path is wherein that the routing algorithm of B-VLAN3006 configuration is consistent, such as 2. 1. BEB1, BEB2 and BCB1 be adjusted into configuration by configuration, 1. etc. and BCB2 and BCB3 still adopt configuration, can filter out forward-path A is the forward-path of equal value that meets technical solution of the present invention, forwards for the flow to B-VLAN3006.Certainly, can also further modify to the configuration of BCB2 or BCB3, meet the forward-path of equal value of technical solution of the present invention so that forward-path B or forward-path C are also updated to, thereby can in many forward-paths of equal value, calculate the forward-path for the flow of B-VLAN3006.
Step 106, falls into a trap and calculates the forward-path corresponding to described backbone network VLAN at the forward-path of equal value of selecting, thereby forwards the SPBM flow of this B-VLAN carrying by the forward-path calculating; Wherein, when B-VLAN has carried SPBM flow, this B-VLAN is bound to corresponding virtual switch instance.
From above-described embodiment, in technical scheme of the present invention, the condition of " carried in hello packet corresponding relation consistent " between B-VLAN and the routing algorithm of SPBM flow without meeting, it is consistent only need to having the corresponding relation between at least one B-VLAN and routing algorithm, and can tolerate that the configuration on each network equipment of corresponding relation between other B-VLAN and routing algorithm is inconsistent, thereby the flow of the consistent B-VLAN of corresponding relation can normally be forwarded.
For the embodiment shown in Fig. 3, suppose in maintenance or optimize in the process of SPBM network, first the configuration of BEB1 is modified, 2. 1. configuration on BEB1 be revised as to configuration, and still apply configuration 1. on BEB2 and BCB1～BCB3, not quite identical on each network equipment of the ECT algorithm that although B-VLAN3006 is corresponding in same forward-path, but still maintain the neighborhood (neighborhood between BEB2 and BCB1～BCB3 is uninfluenced) between BEB1 and BCB1～BCB3.Due on BEB1, BEB2 and BCB1～BCB3, the corresponding relation between B-VLAN3001～3005 and ECT algorithm is consistent, thereby corresponding flow also can normally forward; And for B-VLAN3006, owing to only having BEB1 to adopt configuration 2., cannot forward corresponding flow.
Be described further for the traffic forwarding of B-VLAN3006 below:
When 2. 1. the all-network equipment on arbitrary forward-path be all adjusted into configuration by configuring, make in corresponding relation between B-VLAN3006 and the ECT algorithm all-network equipment on this forward-path all identically, can carry out traffic forwarding by this forward-path.Specifically as shown in Figure 5, suppose after having completed the adjustment of BEB1, further the configuration on BEB2 and BCB3 is adjusted, 2. BEB1, BEB2 and BCB3 all apply configuration, and 1. BCB1 and BCB2 still apply configuration.Now, taking BEB1 as local device, BCB1～BCB3 is as neighbor device, BEB2 are opposite equip., can filter out corresponding forward-path of equal value for B-VLAN3006, i.e. forward-path C, for corresponding traffic forwarding.
Further, suppose 2. the configuration of BCB2 is also adjusted into configuration, can filter out corresponding forward-path of equal value for B-VLAN3006, be i.e. transduction pathway B and forward-path C.Therefore, on BEB1, BEB2, BCB2 and BCB3, all adopt ECT2 to calculate for the traffic forwarding of B-VLAN3006, such as result of calculation is forward-path B, forward by forward-path B the flow that B-VLAN3006 is corresponding.
Further, as shown in Figure 6, suppose that 2. the configuration of BCB1 is also adjusted into configuration, can filter out corresponding forward-path of equal value for B-VLAN3006, i.e. transduction pathway A, transduction pathway B and forward-path C.Therefore, on BEB1, BEB2, BCB1, BCB2 and BCB3, all adopt ECT2 to calculate for the traffic forwarding of B-VLAN3006, such as result of calculation is forward-path B, forward by forward-path B the flow that B-VLAN3006 is corresponding.
It should be noted that: although in the above-described embodiments, taking BEB1 as local device, BCB1～BCB3 is the neighbor device of BEB1, BEB2 is opposite equip., but can be also obviously the opposite equip. of local device or other network equipments by BCB equipment, also can between BCB equipment, set up neighborhood, and all can apply technical scheme of the present invention in corresponding embodiment, the B-VLAN on the network equipment of SPBM neighborhood and the corresponding relation between routing algorithm are made to set up when not quite identical, still can maintain this SPBM neighborhood, avoid as much as possible affecting the forwarding of flow.
Corresponding to the method for above-mentioned calculating forward-path, the invention allows for a kind of device that calculates forward-path, be applied to the SPBM network equipment, comprising:
Maintain unit, for resolving the neighbours' message from neighbor device, and when analysis result be routing algorithm type that in local device and neighbor device, identical backbone network VLAN is corresponding when incomplete same, maintain the neighborhood between local device and neighbor device;
Screening unit, for there is with neighbor device the identical backbone network VLAN that routing algorithm type is different when local device, while calculating the forward-path of local device arrival opposite equip., screen with this backbone network VLAN at the identical forward-path all of equal value of local device upper pathway algorithm types;
Computing unit, calculates the forward-path corresponding to described backbone network VLAN for falling into a trap at the forward-path of equal value filtering out.
Optionally, with described backbone network VLAN at the identical forward-path of equal value of local device upper pathway algorithm types be:
Routing algorithm type corresponding in all bridge equipments of described backbone network VLAN on this equivalence forward-path is all identical.
Optionally, each described backbone network VLAN has carried respectively corresponding SPBM flow.
Optionally, carrying corresponding SPBM flow comprises: be tied to corresponding virtual switch instance.
Optionally, described neighbours' message is SPBM hello packet.
Therefore, the present invention, by safeguarding or optimizing in the process of SPBM network, maintains corresponding SPBM neighborhood, thereby the SPBM neighborhood of avoiding impact to set up makes still converting flow normally of the corresponding ECT algorithm example consistent with B-VLAN.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. calculate a method for forward-path, be applied to the SPBM network equipment, it is characterized in that, comprising:
Resolve from neighbours' message of neighbor device, in the time that routing algorithm type that in local device and neighbor device, identical backbone network VLAN is corresponding is incomplete same, maintain the neighborhood between local device and neighbor device;
The identical backbone network VLAN different with there is routing algorithm type in neighbor device when local device, while calculating the forward-path of local device arrival opposite equip., screen with this backbone network VLAN at the identical forward-path all of equal value of local device upper pathway algorithm types;
Fall into a trap and calculate the forward-path corresponding to described backbone network VLAN at the forward-path of equal value filtering out.
2. method according to claim 1, is characterized in that, with described backbone network VLAN at the identical forward-path of equal value of local device upper pathway algorithm types is:
Routing algorithm type corresponding in all bridge equipments of described backbone network VLAN on this equivalence forward-path is all identical.
3. method according to claim 1, is characterized in that, each described backbone network VLAN has carried respectively corresponding SPBM flow.
4. method according to claim 3, is characterized in that, carries corresponding SPBM flow and comprises: be tied to corresponding virtual switch instance.
5. method according to claim 1, is characterized in that, described neighbours' message is SPBM hello packet.
6. calculate a device for forward-path, be applied to the SPBM network equipment, it is characterized in that, comprising:
Maintain unit, for resolving the neighbours' message from neighbor device, and when analysis result be routing algorithm type that in local device and neighbor device, identical backbone network VLAN is corresponding when incomplete same, maintain the neighborhood between local device and neighbor device;
Screening unit, for there is with neighbor device the identical backbone network VLAN that routing algorithm type is different when local device, while calculating the forward-path of local device arrival opposite equip., screen with this backbone network VLAN at the identical forward-path all of equal value of local device upper pathway algorithm types;
Computing unit, for calculating the forward-path of described backbone network VLAN at the forward-path of equal value filtering out.
7. device according to claim 6, is characterized in that, with described backbone network VLAN at the identical forward-path of equal value of local device upper pathway algorithm types is:
Routing algorithm type corresponding in all bridge equipments of described backbone network VLAN on this equivalence forward-path is all identical.
8. device according to claim 6, is characterized in that, each described backbone network VLAN has carried respectively corresponding SPBM flow.
9. device according to claim 8, is characterized in that, carries corresponding SPBM flow and comprises: be tied to corresponding virtual switch instance.
10. device according to claim 6, is characterized in that, described neighbours' message is SPBM hello packet.
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| WO2013097609A1 (en) * | 2011-12-27 | 2013-07-04 | Hangzhou H3C Technologies Co., Ltd. | Spb based multicast forwarding method and spbm bridge |
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