CN103685031A - Packet forwarding device and packet forwarding method - Google Patents
Packet forwarding device and packet forwarding method Download PDFInfo
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Abstract
The application provides a packet forwarding method and a packet forwarding device. The packet forwarding method includes the following specific steps: in LSPs (link state packet), gateways RB announce which VLANs (Virtual Local Area Network) correspond to respective gateway information, and all the RBs can obtain and add configuration information into respective LSDBs (link state database). During pruning computation, according to the information in the LSDB, the current RB not only needs to judge whether the RB is the AVF of the VLAN, but also needs to further judge whether the RB is the gateway of the VLAN, one of the two conditions needs to be met, related ports can be added into corresponding pruning entries in pruning computation, and thereby the intercommunication between the three layers of a TRILL (Transparent Interconnection of Lots of Links) network can be realized.
Description
Technical field
The application relates to the communication technology, especially relates to the method and apparatus of realizing multicast forwarding in TRILL network.
Background technology
TRILL(Transparent Interconnection of Lots of Links, multichain connects transparent interconnection), be the L2 network standard that IETF recommends.At present, large-scale data center starts to utilize the new technologies such as FCoE that storage transmission and IP transmission are fused on Ethernet, and the Spanning-Tree Protocol of standard (STP) will no longer be applicable to the expansion of UNE or ultra-large type data center.As time goes on, TRILL at least can replace the STP agreement of generally using on L2 network.
In TRILL network, there are two class forwarding-table items: singlecast router list item and multicast routing table item.Wherein singlecast router list item is used in reference to the forwarding of leading known unicast message, and multicast routing table item is used for instructing many objects message, comprises the forwarding of unknown unicast message, L 2 broadcast message and multicast message.The multicast tree root that each RB equipment in TRILL network calculates according to the Information Selection in LSDB.In order to improve the efficiency of traffic forwarding, in each multicast tree, can set up forwarding-table item according to each VLAN or each multicast MAC, realize many objects message and forward according to the beta pruning of RB+VLAN or RB+VLAN+MAC.But three layer protocol messages such as ARP/OSPF that use TRILL multicast tree to forward cannot send to gateway RB according to the multicast forward table of RB+VLAN, three laminar flow amounts are obstructed.
Summary of the invention
In view of this, the application provides a kind of apparatus for forwarding message, for carrying out multicast forwarding at TRILL network, comprising: configuration module, synchronization module and routing module,
Configuration module determines that equipment of itself is the gateway of corresponding VLAN in network, and has corresponding gateway ip address.
Synchronization module sends Link State Packet Reconfigurations information to neighbor device, the configuration information that comprises the gateway that himself is corresponding VLAN in described message, the configuration information carrying in the Link State Packet that record is received, and according to the relevant information in described configuration information sync database;
Routing module carries out route table items calculating according to the information in the database after synchronous, when calculating beta pruning list item, according to RB, beta pruning list item corresponding to related port add to the configuration information of corresponding VLAN, and described beta pruning list item is issued and generates multicast forwarding list item.
Described configuration module further comprises the mode of operation of confirming self, wherein, described in state mode of operation and be divided into single-mode and mixed mode, described single-mode is to be operated in the pattern of two layers, described mixed mode is that work is two or three layers of mixed mode;
Described gateway ip address is by TRILL command configuration;
Described definite mode of operation specifically comprises:
Check self whether there is the gateway ip address that uses TRILL command configuration, if existed, illustrate that mode of operation is mixed mode, if there is no, confirms as single-mode.
Described message is LSP message, and described database is LSDB.
Described Link State Packet further carries the configuration information that RB is the AVF of corresponding VLAN;
When calculating beta pruning list item, described RB further comprises with the configuration information of corresponding VLAN: the AVF that RB is corresponding VLAN.
Invention thought based on same, the application also provides a kind of message forwarding method, for carrying out multicast forwarding at TRILL network, comprising:
Step 1 determines that equipment of itself is the gateway of corresponding VLAN in network, and has corresponding gateway ip address.
Step 2 sends Link State Packet Reconfigurations information to neighbor device, the configuration information that comprises the gateway that himself is corresponding VLAN in described message, the configuration information carrying in the Link State Packet that record is received, and according to the relevant information in described configuration information sync database;
Step 3 is carried out route table items calculating according to the information in the database after synchronous, when calculating beta pruning list item, according to RB, beta pruning list item corresponding to related port add to the configuration information of corresponding VLAN, and described beta pruning list item is issued and generates multicast forwarding list item.
Described method step 1 further comprises the mode of operation of confirming self, wherein, described in state mode of operation and be divided into single-mode and mixed mode, described single-mode is to be operated in the pattern of two layers, described mixed mode is that work is two or three layers of mixed mode;
Described gateway ip address is by TRILL command configuration;
Described definite mode of operation specifically comprises:
Check self whether there is the gateway ip address that uses TRILL command configuration, if existed, illustrate that mode of operation is mixed mode, if there is no, confirms as single-mode.
Described message is LSP message, and described database is LSDB.
Described Link State Packet further carries the configuration information that RB is the AVF of corresponding VLAN;
When calculating beta pruning list item, described RB further comprises with the configuration information of corresponding VLAN: the AVF that RB is corresponding VLAN.In this application, because gateway RB has noticed in LSP, oneself be the gateway information which VLAN is corresponding, all RB can get above-mentioned configuration information and add in the LSDB of oneself.Like this, when beta pruning is calculated, RB is according to the information in LSDB, not only need to judge whether current RB is the AVF of this VLAN, also need further to judge whether this RB is the gateway of this VLAN, both meet one of them, in beta pruning is calculated, related port will be added in corresponding beta pruning list item.Like this, in the TRILL of two or three layers of mixed networking network, three layer protocol messages such as ARP/OSPF of guaranteeing to use TRILL multicast tree to forward can correctly send to gateway, thereby follow-up data message can forward normally by gateway, and three layers, TRILL network has been realized intercommunication.
Accompanying drawing explanation
Fig. 1 is the application's hardware schematic diagram.
Fig. 2 is the application's method schematic diagram.
Fig. 3 be the application practice scene schematic diagram.
Embodiment
In three layers of TRILL network, the port type of RB equipment comprises three kinds: Trunk(trunk) port, Access(access) port and Hybrid(mix) port, wherein, Trunk port is interconnect port between switch, allow to turn TRILL protocol massages and data message, do not receive and dispatch Native Ethernet(local ethernet) message, Access port is access interface, transmitting-receiving Native Ethernet message and TRILL protocol massages, do not receive and dispatch TRILL data message, Hybrid port is Hybrid port, can receive and dispatch TRILL protocol massages and data message and Native Ethernet message, generally, the port default of RB equipment is Trunk port.Three layer protocol messages such as ARP/OSPF enter TRILL network or are directly generated by RB equipment from ACCESS mouth, use TRILL multicast tree (using the multicast forward table of RB+VLAN) to forward.But on gateway RB, due to its generally directly and user network direct-connected, there is not ACCESS mouth, be not assigned to the AVF of associated VLAN yet, and according to the computational methods of multicast forward table in existing TRILL network, port in multicast forward table is to be added by the RB triggering that has AVF in port downstream, and the port being connected with gateway is not therein, therefore when multicast tree is calculated, gateway RB can't be taken into account, there will not be in multicast tree, so, the routing table calculating according to multicast tree, in TRILL aspect, the path that arrives RB gateway can not be provided.This just causes three layer protocol messages such as ARP/OSPF that use TRILL multicast tree to forward to send to gateway RB according to the multicast forward table of RB+VLAN, gateway RB does not receive ARP/OSPF protocol massages, also just cannot carry out the corresponding operation of processing, in TRILL network, just show as three laminar flow amounts obstructed.
In order to address this problem, the application provides a kind of apparatus for forwarding message, for carrying out multicast forwarding at TRILL network, the basic hardware environment of this device comprises CPU, internal memory, nonvolatile memory and other hardware, as shown in Figure 1, this device logically comprises: configuration module, synchronization module and routing module, these modules are actually computer program and by CPU, are loaded in internal memory operation and form.Please also refer to Fig. 2, described device is carried out following flow process in running:
Step 11, configuration module determines that equipment of itself is the gateway of corresponding VLAN in network, and has corresponding gateway ip address.
Step 13, synchronization module sends Link State Packet Reconfigurations information to neighbor device, the configuration information that comprises the gateway that himself is corresponding VLAN in described message, the configuration information carrying in the Link State Packet that the neighbours that record is received send, and according to the relevant information in the configuration synchronization database of the described link-state information of described configuration.
Step 15, routing module carries out route table items calculating according to the information in the database after synchronous, when calculating the beta pruning list item of RB+VLAN, according to RB, add the beta pruning list item of corresponding RB+VLAN to the configuration information related port of corresponding VLAN, and described beta pruning list item is issued and drives generation multicast forwarding list item.
Described configuration information may further include: the AVF that current RB is corresponding VLAN.Described RB can carry the configuration information of the AVF which VLAN RB is in Link State Packet, the RB that receives this message can take in relevant configuration in corresponding database for follow-up route calculating, when carrying out the calculating of beta pruning list item, current RB judges according to the configuration information of collecting in database: whether RB is gateway or the AVF of corresponding VLAN, both meet any one, all relevant port are added in the beta pruning list item of corresponding RB+VLAN.
Wherein, in step 11, may further include the mode of operation of confirming self, described mode of operation is divided into single-mode and mixed mode, and described single-mode is to be operated in the pattern of two layers, and described mixed mode is that work is two or three layers of mixed mode.The mode of operation of described confirmation self specifically comprises: if find gateway ip address in configuration, the gateway ip address especially configuring by TRILL order line, confirms self to be operated in mixed mode, otherwise, confirm self to be operated in single-mode.
Optionally, in TRILL network, general conventional LSP(Link State Protocol Data Unit) message upgrades link-state information, the database adopting is LSDB(Link-State Data Base, LSD), certainly, as a kind of mode realizing, the proprietary protocol that can adopt definition is realize the renewal of Link State and database synchronous, and concrete message and database application are not as limiting to the invention.
In superincumbent step, the application's utilization is carried this equipment for the configuration of gateway corresponding to which VLAN between BR in mutual link-state information message, described message can be preferably current comparatively general LSP message, and by LSP diffusion process, make the BR in network all learn this configuration, and synchronous database information separately, preferred, database can be the LSDB corresponding with LSP message.When each RB carries out route calculating according to the database after synchronous, can be the configuration information of the gateway of which VLAN according to which RB obtaining, and according to original configuration, for example: the AVF information that each RB is corresponding, information of multicast router and multicast receivers etc. is added the port that connects gateway in outbound port list item simultaneously, like this, when RB receives three layer protocol messages, can from the multicast forward table of oneself, find the route of going to gateway, thereby realize three layer intercommunications.
Below, by a concrete example, specifically describe the application's technical scheme in detail, in application scenarios as shown in Figure 3, suppose that RB1 is multicast tree root, and the gateway of also serving as VLAN1 and VLAN2 simultaneously, the AVF that RB4 and RB5 are VLAN1, the AVF that RB6 and RB7 are VLAN2, described Link State Update Packet can adopt popular LSP message, and supporting database is LSDB.According to description above, RB2 calculates take in the beta pruning list item that RB1 is root VLAN1 and only has port one and 2 two outbound ports of port, and like this, two layers of traffic forwarding in the subnet 1 connecting by RB2 and subnet 2 are normal.But, terminal A in subnet 1 wants to access the terminal E of external network different segment, or when the terminal A in subnet 1 wants the terminal D in travelling across VLAN access subnetwork 4, ARP message need to first be sent and gateway RB1 is mutual, follow-up data flow is first issued gateway, by gateway RB1, continued to forward, but, according to the beta pruning of prior art scheme, calculate the multicast forwarding list item generating, R1 is not on multicast forwarding path, this has just caused ARP message cannot normally arrive gateway, R1 cannot receive ARP message, can not process message, this just causes follow-up flow to forward, in TRILL network, the flow of three layers is obstructed.
The application provides following flow process for addressing this problem, and in the lump with reference to the application scenarios shown in figure 3, a kind of execution mode that the application provides specifically comprises:
Step 301, after neighborhood is set up, each RB in TRILL network determines according to configuration in advance whether equipment of itself is the gateway of corresponding VLAN in network, and determines the mode of operation of oneself.
In the application's example, RB1 is the gateway of VLAN1 and VLAN2, that is to say, on the equipment of RB1, exist by the gateway ip address of TRILL command configuration, show the IP address as the use of VLAN1 and VLAN2 gateway, this has determined that RB1 is when determining mode of operation, it must be mixed mode, be operated in the pattern of two or three layers, other RB is owing to not serving as the gateway of any VLAN, and its mode of operation can be configured to two layer models of acquiescence.
After step 302 configuration take-effective, RB1 carries oneself for the configuration information of the gateway of VLAN1 and VLAN2 in the LSP sending, and described LSP is spread to neighbor device.
In existing realization, if RB is not configured to the gateway of certain VLAN, the configuration information carrying in its LSP specifically comprises the AVF information that each RB is corresponding, the information of multicast router and multicast receivers, such configuration information can not meet the needs that three layers of Multicast Routing calculate, so the application's RB1 is when self being configured to the gateway of corresponding VLAN1 and VLAN2, in LSP, except carrying, comprise above-mentioned configuration, also need to carry the configuration information from the gateway as corresponding VLAN.Further, carrying of this information can realize by adding new TLV form, and how defining concrete form is the technology application of comparative maturity, at this, does not do too much explanation, user can be according to the application habit self-defining of oneself, and this is not as the application's limited range.Certainly, in existing realization, the RB equipment that may be configured to gateway is not limited to one, perhaps can be according to actual networking situation, different RB is configured to the gateway of different VLAN, to realize the shunting of business or the optimization of networking, the application only be take the situation that RB1 is gateway and is given an example, and exists the situation of many gateway RB to be equally applicable to the application's technical scheme in network.
Step 33 neighbours RB receives after described LSP message, the configuration information carrying in the LSP that record is received, and according to the relevant information in described configuration information update LSDB.
RB2 receives after the LSP information of RB1, by the LSP comparison in itself and local LSDB, if described LSP is newer than local LSP, this new LSP is deposited in to the LSDB of oneself, last again this new LSP is sent to the neighbours except sending the neighbours of this LSP to spread, with realize LSDB synchronously.Wherein, above-mentioned comparative result is so-called new, refer to the sequence number of described LSP, Remaining Lifetime(remained to life span) and Checksum(verification and) carry out size comparison, according to comparative result, determine whether up-to-date LSP, if up-to-date LSP, configuration in the local LSDB of configuration information update carrying according to it, if not up-to-date LSP, abandons the LSP receiving.
Each RB of step 34 carries out route calculating according to the information in the LSDB after synchronous, when calculating the beta pruning list item of RB+VLAN, according to the RB in database, related port is added to the beta pruning list item of corresponding RB+VLAN with the configuration relation of corresponding VLAN, and described beta pruning list item is issued and generates multicast forwarding list item.
In above-mentioned steps, by realizing synchronization link slip condition database between each RB of LSP diffusion way, now, in network, every RB has identical LSDB, has obtained the unified understanding to whole net topology.Then each RB will be take LSDB information as basis, utilize nickname that SPF algorithm calculates appointment as tree root to information such as the shortest path between all RB of the whole network and outgoing interfaces, nickname information in conjunction with each RB issue in LSDB, finally generates nickname and transmits.In this process, the access vlan information that the RB in the environment of multicast networking can notice based on each Ingress RB, carries out beta pruning calculating.If certain the upper user who does not have access to belong to this multicast group of RB will fall this RB beta pruning in this multicast group.In this application, because gateway RB1 has noticed in LSP, oneself be the gateway information which VLAN is corresponding, all RB can get above-mentioned configuration information and add in the LSDB of oneself.Like this, when beta pruning is calculated, RB is according to the information in LSDB, not only need to judge whether current RB is the AVF of this VLAN, also need further to judge whether this RB is the gateway of this VLAN, both meet one of them, in beta pruning is calculated, related port will be added in corresponding beta pruning list item.
In scene as shown in Figure 3, RB2 be take the list item of the VLAN1 that RB1 is tree root, the configuration information of the gateway that the AVF configuration information that can be VLAN1 according to which RB preserving in LSDB and which RB are VLAN1 carries out port interpolation, here, the AVF that RB4 and RB5 are VLAN1, RB1 serves as the gateway of VLAN1, so, RB2 is by port one, and port 2 and port 3 all add in port list, and result of calculation is issued and drives generation multicast forwarding list item.Terminal A in subnet 1 wants to access the terminal E of external network different segment, or the terminal A in subnet 1 wants the terminal D in travelling across VLAN access subnetwork 4, ARP message need to first be sent and gateway RB1 is mutual, ARP message is used RB1 to forward for multicast tree root, while arriving RB2, can correctly be transmitted to gateway, what follow-up like this flux of multicast just can be correct forwards.
In the TRILL of two or three layers of mixed networking network, use new method to calculate the multicast forward table of RB+VLAN, guarantee that three layer protocol messages such as ARP/OSPF that use TRILL multicast tree to forward can correctly send to gateway, thereby follow-up data message can forward normally by gateway, three layers, TRILL network has been realized intercommunication.
The foregoing is only the application's preferred embodiment, not in order to limit the application, all within the application's spirit and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.
Claims (10)
1. an apparatus for forwarding message, at TRILL(Transparent Interconnection of Lots of Links, multichain connects transparent interconnection) carry out multicast forwarding in network, it is characterized in that, comprising: configuration module, synchronization module and routing module,
Configuration module determines that equipment of itself is the gateway of corresponding VLAN in network, and has corresponding gateway ip address.
Synchronization module sends Link State Packet Reconfigurations information to neighbor device, the configuration information that comprises the gateway that himself is corresponding VLAN in described message, the configuration information carrying in the Link State Packet that record is received, and according to the relevant information in described configuration information sync database;
Routing module carries out route table items calculating according to the information in the database after synchronous, when calculating beta pruning list item, according to RB, beta pruning list item corresponding to related port add to the configuration information of corresponding VLAN, and described beta pruning list item is issued and generates multicast forwarding list item.
2. device as claimed in claim 1, is characterized in that,
Described configuration module further comprises the mode of operation of confirming self, wherein, described in state mode of operation and be divided into single-mode and mixed mode, described single-mode is to be operated in the pattern of two layers, described mixed mode is that work is two or three layers of mixed mode.
3. device as claimed in claim 2, is characterized in that, described gateway ip address is by TRILL command configuration;
Described definite mode of operation specifically comprises:
Check self whether there is the gateway ip address that uses TRILL command configuration, if existed, illustrate that mode of operation is mixed mode, if there is no, confirms as single-mode.
4. device as claimed in claim 1, is characterized in that, described message is LSP message, and described database is LSDB.
5. device as claimed in claim 1, is characterized in that, described Link State Packet further carries the configuration information that RB is the AVF of corresponding VLAN;
When calculating beta pruning list item, described RB further comprises with the configuration information of corresponding VLAN: the AVF that RB is corresponding VLAN.
6. a message forwarding method, for carrying out multicast forwarding at TRILL network, is characterized in that, comprising:
Step 1 determines that equipment of itself is the gateway of corresponding VLAN in network, and has corresponding gateway ip address.
Step 2 sends Link State Packet Reconfigurations information to neighbor device, the configuration information that comprises the gateway that himself is corresponding VLAN in described message, the configuration information carrying in the Link State Packet that record is received, and according to the relevant information in described configuration information sync database;
Step 3 is carried out route table items calculating according to the information in the database after synchronous, when calculating beta pruning list item, according to RB, beta pruning list item corresponding to related port add to the configuration information of corresponding VLAN, and described beta pruning list item is issued and generates multicast forwarding list item.
7. method as claimed in claim 6, is characterized in that,
Described method step 1 further comprises the mode of operation of confirming self, wherein, described in state mode of operation and be divided into single-mode and mixed mode, described single-mode is to be operated in the pattern of two layers, described mixed mode is that work is two or three layers of mixed mode.
8. method as claimed in claim 7, is characterized in that, described gateway ip address is by TRILL command configuration;
Described definite mode of operation specifically comprises:
Check self whether there is the gateway ip address that uses TRILL command configuration, if existed, illustrate that mode of operation is mixed mode, if there is no, confirms as single-mode.
9. method as claimed in claim 6, is characterized in that, described message is LSP message, and described database is LSDB.
10. method as claimed in claim 6, is characterized in that, described Link State Packet further carries the configuration information that RB is the AVF of corresponding VLAN;
When calculating beta pruning list item, described RB further comprises with the configuration information of corresponding VLAN: the AVF that RB is corresponding VLAN.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486193A (en) * | 2014-12-11 | 2015-04-01 | 华为技术有限公司 | Method for establishing network node interconnection, and device for establishing network node interconnection |
| CN109104700A (en) * | 2018-10-10 | 2018-12-28 | 中国电子科技集团公司第七研究所 | A kind of more mesh method of multicasting being suitable for narrowband wireless communication network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694714B (en) * | 2011-03-21 | 2015-01-21 | 华为技术有限公司 | Method, device, system and a non-forwarder non-forwarding bridge for message transmission in TRILL network |
| CN102223303A (en) * | 2011-06-14 | 2011-10-19 | 杭州华三通信技术有限公司 | Load equilibrium method based on transparent interconnection of lots of links (TRILL) and routing bridge (RB) |
| CN103209132B (en) * | 2012-01-16 | 2017-06-27 | 华为技术有限公司 | In the interconnection of transparent multilink（TRILL）Method, the apparatus and system of multicast are realized in network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486193A (en) * | 2014-12-11 | 2015-04-01 | 华为技术有限公司 | Method for establishing network node interconnection, and device for establishing network node interconnection |
| CN104486193B (en) * | 2014-12-11 | 2017-11-24 | 华为技术有限公司 | A kind of method and device for establishing network node interconnection |
| CN109104700A (en) * | 2018-10-10 | 2018-12-28 | 中国电子科技集团公司第七研究所 | A kind of more mesh method of multicasting being suitable for narrowband wireless communication network |
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