CN103685031B - Packet forwarding device and packet forwarding method - Google Patents
Packet forwarding device and packet forwarding method Download PDFInfo
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- CN103685031B CN103685031B CN201310754100.9A CN201310754100A CN103685031B CN 103685031 B CN103685031 B CN 103685031B CN 201310754100 A CN201310754100 A CN 201310754100A CN 103685031 B CN103685031 B CN 103685031B
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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 is related to the communication technology, especially relates to the method and apparatus realizing multicast forwarding in trill network.
Background technology
Trill(transparent interconnection of lots of links, multi-link transparent interconnection), it is
The l2 network standard that ietf recommends.At present, large-scale data center starts with the new technologies such as fcoe and will store transmission and ip transmission
It is fused on Ethernet, and the Spanning-Tree Protocol (stp) of standard will be no longer appropriate for the expansion of UNE or ultra-large type data center
Exhibition.As time goes on, trill at least can replace the stp agreement commonly using on l2 network.
In trill network, there are two class forwarding-table items: singlecast router list item and multicast routing table item.Wherein unicast road
It is used for instructing the forwarding of known unicast message by list item, multicast routing table item is used for instructing many purposes message, including unknown unicast
The forwarding of message, L 2 broadcast message and multicast message.Each rb equipment in trill network selects according to the information in lsdb
The multicast tree root calculating.In order to improve the efficiency of flow forwarding, can be according to each vlan or each group in each multicast tree
Broadcast mac and set up forwarding-table item, realize many purposes message and forward according to the beta pruning of rb+vlan or rb+vlan+mac.But, use
Three layer protocol messages such as the arp/ospf that trill multicast tree forwards cannot be sent to gateway according to the multicast forward table of rb+vlan
Rb, three laminar flow amounts are obstructed.
Content of the invention
In view of this, the application provides a kind of apparatus for forwarding message, for carrying out multicast forwarding in trill network, bag
Include: configuration module, synchronization module and routing module,
Configuration module determines the gateway that equipment of itself is corresponding vlan in network, and there is corresponding gateway ip address.
Synchronization module updates configuration information to neighbor device transmission link state message, and comprising its own in described message is
The configuration information of the gateway of corresponding vlan, records the configuration information carrying in the Link State Packet receiving, and is joined according to described
Confidence ceases the relevant information in sync database；
Routing module carries out route table items calculating according to the information in the database after synchronization, when calculating beta pruning list item,
Related port is added to the configuration information of corresponding vlan by corresponding beta pruning list item according to rb, and described beta pruning list item is issued
Generate multicast forwarding list item.
Described configuration module further includes to confirm the mode of operation of itself, wherein, described state mode of operation be divided into single
Pattern and mixed mode, described single-mode is to be operated in two layers of pattern, and described mixed mode is two or three layers of mixing for work
Pattern；
Described gateway ip address is to be configured by trill order；
Described determination mode of operation specifically includes:
Check the gateway ip address that itself whether there is using trill order configuration, if it is present explanation mode of operation
For mixed mode, if it does not exist, then confirming as single-mode.
Described message is lsp message, and described database is lsdb.
Described Link State Packet carries the configuration information of the avf that rb is corresponding vlan further；
When calculating beta pruning list item, described rb is further included with the configuration information of corresponding vlan: rb is corresponding vlan
avf.
Based on same invention thought, the application also provides a kind of message forwarding method, for carrying out in trill network
Multicast forwarding, comprising:
Step 1 determines the gateway that equipment of itself is corresponding vlan in network, and there is corresponding gateway ip address.
Step 2 updates configuration information to neighbor device transmission link state message, and it is right for comprising its own in described message
Answer the configuration information of the gateway of vlan, record the configuration information carrying in the Link State Packet receiving, and according to described configuration
Relevant information in synchronizing information database；
Step 3 carries out route table items calculating according to the information in the database after synchronization, when calculating beta pruning list item, according to
Related port is added to corresponding beta pruning list item with the configuration information of corresponding vlan by rb, and described beta pruning list item is issued generation
Multicast forwarding list item.
Methods described step 1 further includes to confirm the mode of operation of itself, wherein, described state mode of operation be divided into single
Pattern and mixed mode, described single-mode is to be operated in two layers of pattern, and described mixed mode is two or three layers of mixing for work
Pattern；
Described gateway ip address is to be configured by trill order；
Described determination mode of operation specifically includes:
Check the gateway ip address that itself whether there is using trill order configuration, if it is present explanation mode of operation
For mixed mode, if it does not exist, then confirming as single-mode.
Described message is lsp message, and described database is lsdb.
Described Link State Packet carries the configuration information of the avf that rb is corresponding vlan further；
When calculating beta pruning list item, described rb is further included with the configuration information of corresponding vlan: rb is corresponding vlan
avf.In this application, oneself it is the corresponding gateway information of which vlan because gateway rb have advertised in lsp, all of rb is
Above-mentioned configuration information can be got and be added in the lsdb of oneself.So, when beta pruning calculates, rb is according to the letter in lsdb
Breath, not only needs to judge that whether current rb is the avf of this vlan in addition it is also necessary to determine whether that whether this rb is the net of this vlan
Close, both meet one of them, related port will be added in corresponding beta pruning list item in beta pruning calculates.So, exist
It is ensured that using the three layer protocol message energy such as arp/ospf of trill multicast tree forwarding in the trill network of two or three layers of mixed networking
Enough correctly it is sent to gateway, thus follow-up data message normally can be forwarded by gateway, the three layers of realization of trill network
Intercommunication.
Brief description
Fig. 1 is the hardware schematic of the application.
Fig. 2 is the present processes schematic diagram.
Fig. 3 be the application practice scene schematic diagram.
Specific embodiment
In three layers of trill network, the port type of rb equipment includes three kinds: trunk(trunk) port, access(connects
Enter) port and hybrid(mixing) port, wherein, trunk port be between switch interconnection port it is allowed to turn trill agreement
Message data message, does not receive and dispatch native ethernet(local ethernet) message, access port is access interface, receives
Send out native ethernet message and trill protocol massages, do not receive and dispatch trill data message, hybrid port is mixing end
Mouthful, trill protocol massages data message and native ethernet message, generally, the end of rb equipment can be received and dispatched
Mouth is defaulted as trunk port.Arp/ospf etc. three layer protocol message enters trill network or straight by rb equipment from access mouth
Deliver a child into, forwarded using trill multicast tree (using the multicast forward table of rb+vlan).But on gateway rb, due to it
General not direct and user network is direct-connected, there is not access mouth, is also not allocated to the avf of related vlan, and according to existing
Trill network in multicast forward table computational methods, the port in multicast forward table is by the rb of the presence avf in port downstream
Triggering is added, and the port being connected with gateway is not wherein, and therefore when multicast tree calculates, gateway rb can't be by
Take into account, do not appear in multicast tree, so, the routing table being calculated according to multicast tree, in trill aspect it is impossible to carry
For reaching the path of rb gateway.This results in three layer protocol messages such as arp/ospf forwarding using trill multicast tree cannot be by
Multicast forward table according to rb+vlan is sent to gateway rb, and gateway rb does not receive arp/ospf protocol massages, just cannot be carried out yet
Corresponding process operates, and will appear as three laminar flow amounts obstructed in trill network.
In order to solve this problem, the application provides a kind of apparatus for forwarding message, for carrying out multicast in trill network
Forward, the basic hardware environment of this device includes cpu, internal memory, nonvolatile memory and other hardware, as shown in figure 1, should
Device logically includes: configuration module, synchronization module and routing module, and these modules are actually computer program by cpu
It is loaded onto operation in internal memory and formed.Please also refer to Fig. 2, described device executes below scheme in running:
Step 11, configuration module determines the gateway that equipment of itself is corresponding vlan in network, and there is corresponding gateway
Ip address.
Step 13, synchronization module updates configuration information to neighbor device transmission link state message, comprises in described message
Its own is the configuration information of the gateway of corresponding vlan, records the configuration carrying in the Link State Packet that the neighbours receiving send
Information, and according to the described relevant information configuring in sync database configuring described link-state information.
Step 15, routing module carries out route table items calculating according to the information in the database after synchronization, is calculating rb+
During the beta pruning list item of vlan, it is added to the beta pruning of corresponding rb+vlan according to rb and the configuration information related port of corresponding vlan
List item, and described beta pruning list item is issued driving generation multicast forwarding list item.
Described configuration information may further include: current rb is the avf of corresponding vlan.Described rb is in Link State report
Wen Zhonghui carries the configuration information of the avf which vlan rb is, receive this message rb relevant configuration can be taken in corresponding
Use for follow-up router-level topology in database, when carrying out the calculating of beta pruning list item, current rb collects according in database
Configuration information judge: whether rb is gateway or the avf of corresponding vlan, and both meet any one, all by related port
It is added in the beta pruning list item of corresponding rb+vlan.
Wherein, in a step 11, may further include the confirmation mode of operation of itself, described mode of operation is divided into single
Pattern and mixed mode, described single-mode is to be operated in two layers of pattern, and described mixed mode is two or three layers of mixing for work
Pattern.The described confirmation mode of operation of itself specifically includes: if finding gateway ip address in configuration, especially by
The gateway ip address of trill order line configuration, then confirm itself to be operated in mixed mode, otherwise, then confirm itself to be operated in list
One pattern.
Optionally, in trill network, typically commonly use lsp(link state protocol data unit) message
Update link-state information, the database being adopted is lsdb(link-state data base, LSD), when
So, as realize a kind of mode, can using definition proprietary protocol be realize Link State renewal database same
Step, specific message database application is not as limiting to the invention.
In superincumbent step, which the application is using carrying this equipment in the link-state information message of interaction between br
The configuration of the corresponding gateway of individual vlan, described message can be preferably lsp message more general at present, and expanded by lsp
Scattered process is so that the br in network learns to this configuration, and synchronous respective database information is it is preferred that database can
Think lsdb corresponding with lsp message.When each rb carries out router-level topology according to the database after synchronization, can be according to acquisition
Which rb is the configuration information of the gateway of which vlan, and according to original configuration, for example: the corresponding avf information of each rb, multicast
Information of router and multicast receivers etc., the port connecting gateway is added simultaneously in exit port list item, so, in rb
When receiving three layer protocol messages, the route going to gateway can be found from the multicast forward table of oneself, thus realizing three layers mutually
Logical.
Below, the technical scheme of the application is specifically described in detail by a specific example, application as shown in Figure 3
It is assumed that rb1 is multicast tree root in scene, and also serve as the gateway of vlan1 and vlan2, rb4 and rb5 is the avf of vlan1 simultaneously,
Rb6 and rb7 is the avf of vlan2, and described Link State Update Packet using popular lsp message, supporting database can be
lsdb.According to description above, rb2 calculate with rb1 for the beta pruning list item of root vlan1 in only exist port 1 and port 2 two
Exit port, so, two laminar flow amounts in the subnet 1 and subnet 2 being connected by rb2 forward normal.But, when in subnet 1
Terminal a that terminal a desires access in terminal e of external network different segment, or subnet 1 is wanted in across vlan access subnetwork 4
Terminal d when, need first to send arp message and interact with gateway rb1, follow-up data flow first issues gateway, is continued by gateway rb1
Forward, but, the beta pruning according to prior art calculates the multicast forwarding list item generating, and r1 is not in multicast forwarding path
On, which results in arp message and cannot normally reach gateway, r1 cannot receive arp message it is impossible to process to message, this
Result in follow-up flow cannot forward, in trill network, three layers of flow is obstructed.
The application provides below scheme to be used for solving this problem, in the lump the application scenarios with reference to shown in Fig. 3, and the application carries
For a kind of embodiment specifically include:
Step 301, after neighborhood is set up, each rb in trill network determines itself according to configuration in advance
Whether equipment is the gateway corresponding to vlan in network, and determine the mode of operation of oneself.
In the example of the application, rb1 is the gateway of vlan1 and vlan2 that is to say, that existing logical on the equipment of rb1
Cross the gateway ip address of trill order configuration, display, as the ip address of the use of vlan1 and vlan2 gateway, which dictates that
Rb1, when determining mode of operation, must be mixed mode, that is, be operated in two or three layers of pattern, and other rb are not due to carrying on a shoulder pole
Appoint the gateway of any vlan, its mode of operation is configurable to two layer models given tacit consent to.
After step 302 configuration take-effective, rb1 carries joining of the gateway that oneself is vlan1 and vlan2 in the lsp sending
Confidence ceases, and described lsp is spread to neighbor device.
In existing realization, if rb is not configured as the gateway of certain vlan, the configuration information carrying in its lsp
Specifically include each rb corresponding avf information, the information of multicast router and multicast receivers, such configuration information can not be expired
The needs that three layers of Multicast Routing of foot calculate, so, the rb1 of the application is in the gateway itself being configured to corresponding vlan1 and vlan2
When, in addition it is also necessary to carry the configuration information from the gateway as corresponding vlan in addition to carrying including above-mentioned configuration in lsp.Enter
One step, carrying of this information can be realized by adding new tlv form, and how to define specific form is to compare into
Ripe technology application, here does not do excessive explanation, and user can be according to the application habit self-defining of oneself, and this is not made
Restriction scope for the application.Certainly, in existing realization, the rb equipment that may be configured to gateway is not limited to one, or
Permitted according to actual networking situation, different rb can be configured to the gateway of different vlan, with realize business shunting or
The optimization of networking, the situation only with rb1 as gateway for the application is illustrated, and the situation that there is multiple stage gateway rb in network is equally suitable
Technical scheme for the application.
After step 33 neighbours rb receives described lsp message, record the configuration information carrying in the lsp receiving, and according to institute
State the relevant information in configuration information update lsdb.
After rb2 receives the lsp information of rb1, it is compared with the lsp in local lsdb, if described lsp is than local
Lsp is new, then this new lsp is stored in the lsdb of oneself, this new lsp is finally sent to neighbour except sending this lsp again
Neighbours beyond residence are diffused, to realize the synchronization of lsdb.Wherein, above-mentioned comparative result is so-called new, and referring to will be described
The sequence number of lsp, remaining lifetime(residue life span) and checksum(verification with) carry out size and compare, root
Determine whether up-to-date lsp according to comparative result, if up-to-date lsp, then local according to the configuration information update that it carries
The lsp receiving if not up-to-date lsp, is then abandoned by the configuration in lsdb.
Each rb of step 34 carries out router-level topology according to the information in the lsdb after synchronization, in the beta pruning calculating rb+vlan
During list item, related port is added to the configuration relation of corresponding vlan by cutting of corresponding rb+vlan according to the rb in database
Branch list item, and described beta pruning list item is issued generation multicast forwarding list item.
In above-mentioned steps, by each rb of lsp diffusion way between realize synchronization link slip condition database, now, network
In every rb have identical lsdb, that is, obtain the unified understanding to whole net topology.Then each rb will be with lsdb information as base
Plinth, by the use of spf algorithm calculate the nickname that specifies as tree root to all rb of the whole network between shortest path and outgoing interface
Etc. information, the nickname information issued in conjunction with rb each in lsdb, ultimately generate nickname forward table.In the process, group
Broadcast the access vlan information that the rb in networked environments can be noticed based on each ingress rb, carry out beta pruning calculating.If certain
Do not access, on rb, the user belonging to this multicast group, in this multicast group, this rb beta pruning will be fallen.In this application, due to net
Closing rb1 and have advertised in lsp oneself is the corresponding gateway information of which vlan, and all of rb can get above-mentioned configuration information
And be added in the lsdb of oneself.So, when beta pruning calculates, rb, according to the information in lsdb, not only needs to judge current
Rb be whether the avf of this vlan in addition it is also necessary to determine whether that whether this rb is the gateway of this vlan, both meet one of them,
Related port will be added in corresponding beta pruning list item in beta pruning calculates.
In scene as shown in Figure 3, rb2 is the vlan1 with rb1 as tree root when calculating the beta pruning list item of rb1+vlan1
List item, can be the avf configuration information of vlan1 and gateway which rb is vlan1 according to which rb preserving in lsdb
Configuration information carries out port interpolation, and here, rb4 and rb5 is the avf of vlan1, and rb1 serves as the gateway of vlan1, so, rb2 will
Port 1, port 2 and port 3 are all added in port list, and result of calculation is issued driving generation multicast forwarding list item.When
Terminal a that terminal a in subnet 1 desires access in terminal e of external network different segment, or subnet 1 wants across vlan visit
Ask terminal d in subnet 4, need first to send arp message and interact with gateway rb1, arp message is carried out for multicast tree root using rb1
Forward, can correctly be transmitted to gateway when reaching rb2, so follow-up flux of multicast just can correctly be forwarded.
In the trill network of two or three layers of mixed networking, calculate the multicast forward table of rb+vlan using new method, really
Protect three layer protocol messages such as the arp/ospf forwarding using trill multicast tree and can correctly be sent to gateway, thus follow-up number
Normally can be forwarded by gateway according to message, three layers of trill network achieves intercommunication.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all essences in the application
Within god and principle, any modification, equivalent substitution and improvement done etc., should be included within the scope of the application protection.
Claims (10)
1. a kind of apparatus for forwarding message, in trill (transparent interconnection of lots of
Links, multi-link transparent interconnection) carry out multicast forwarding it is characterised in that including in network: configuration module, synchronization module and road
By module,
Configuration module determines the gateway that equipment of itself is corresponding vlan in network, and there is corresponding gateway ip address；
Synchronization module is to neighbor device transmission link state message, so that described neighbor device updates according to Link State Packet
Configuration information, comprises the configuration information of the gateway that its own is corresponding vlan, records the chain receiving in described Link State Packet
The configuration information carrying in line state message, and according to the described configuration information sync database in the Link State Packet receiving
In relevant information；
Routing module carries out route table items calculating according to the information in the database after synchronization, when calculating beta pruning list item, according to
Related port is added to corresponding beta pruning list item with the configuration information of corresponding vlan by rb, and described beta pruning list item is issued generation
Multicast forwarding list item.
2. device as claimed in claim 1 it is characterised in that
Described configuration module further includes to confirm the mode of operation of itself, wherein, described mode of operation be divided into single-mode and
Mixed mode, described single-mode is to be operated in two layers of pattern, and described mixed mode is to be operated in two or three layers of pattern.
3. device as claimed in claim 2 is it is characterised in that described gateway ip address is to be configured by trill order；
The described confirmation mode of operation of itself specifically includes:
Check the gateway ip address that itself whether there is using trill order configuration, if it is present explanation mode of operation is mixed
Syntype, if it does not exist, then confirm as single-mode.
4. device as claimed in claim 1 is it is characterised in that described Link State Packet is Link State Protocol Data Unit
Lsp message, described database is LSD lsdb.
5. device as claimed in claim 1 is it is characterised in that it is corresponding vlan that described Link State Packet carries rb further
Avf configuration information；
When calculating beta pruning list item, described rb is further included with the configuration information of corresponding vlan: rb is the avf of corresponding vlan.
6. a kind of message forwarding method, for carrying out multicast forwarding in trill network it is characterised in that including:
Step 1 determines the gateway that equipment of itself is corresponding vlan in network, and there is corresponding gateway ip address；
Step 2 is to neighbor device transmission link state message, so that described neighbor device updates according to Link State Packet joining
Confidence ceases, and comprises the configuration information of the gateway that its own is corresponding vlan, record the link receiving in described Link State Packet
The configuration information carrying in state message, and according in the described configuration information sync database in the Link State Packet receiving
Relevant information；
Step 3 carries out route table items calculating according to the information in the database after synchronization, calculate beta pruning list item when, according to rb with
Related port is added to corresponding beta pruning list item by the configuration information of corresponding vlan, and described beta pruning list item is issued generation multicast
Forwarding-table item.
7. method as claimed in claim 6 it is characterised in that
Methods described step 1 further includes to confirm the mode of operation of itself, wherein, described mode of operation be divided into single-mode and
Mixed mode, described single-mode is to be operated in two layers of pattern, and described mixed mode is to be operated in two or three layers of pattern.
8. method as claimed in claim 7 is it is characterised in that described gateway ip address is to be configured by trill order；
The described confirmation mode of operation of itself specifically includes:
Check the gateway ip address that itself whether there is using trill order configuration, if it is present explanation mode of operation is mixed
Syntype, if it does not exist, then confirm as single-mode.
9. method as claimed in claim 6 is it is characterised in that described Link State Packet is Link State Protocol Data Unit
Lsp message, described database is LSD lsdb.
10. method as claimed in claim 6 is it is characterised in that it is to correspond to that described Link State Packet carries rb further
The configuration information of the avf of vlan；
When calculating beta pruning list item, described rb is further included with the configuration information of corresponding vlan: rb is the avf of corresponding vlan.
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| 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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| CN102694714A (en) * | 2011-03-21 | 2012-09-26 | 华为技术有限公司 | Method, device, system and a non-forwarder non-forwarding bridge for message transmission in TRILL network |
| CN103209132A (en) * | 2012-01-16 | 2013-07-17 | 华为技术有限公司 | Method, device and system for achieving multicast in transparent interconnection of lots of links (TRILL) network |
| CN103248569A (en) * | 2012-02-08 | 2013-08-14 | 杭州华三通信技术有限公司 | Method and device for achieving TRILL network equivalent path |
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| CN102694714A (en) * | 2011-03-21 | 2012-09-26 | 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) |
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