CN1744563B - Method for realizing strate gic route in Ethernet switch - Google Patents
Method for realizing strate gic route in Ethernet switch Download PDFInfo
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Abstract
The invention discloses a method for realizing strategic route in an Ethernet switch, including steps: configuring the strategic route; based on the strategic route, building a forwarding list item of a hardware route; based on the forwarding list item of the hardware route, Ethernet exchange performing strategic forwarding for the message; according to a prearranged mode, maintaining the forwarding list item of the hardware route; using a special lookup algorithm to timingly refresh the forwarding list item of the hardware route corresponding to the strategic route to update the forwarding list item of the hardware route corresponding to the strategic route in time. The invention can effectively realize load sharing of network on Ethernet exchange, quickly respond to the variety of strategic route of network, at the same time realize backup of flux forwarding, and raise stability of network operation.
Description
Technical field
The present invention relates to network communications technology field, be specifically related to a kind of on Ethernet switch the method for implementation strategy route.
Background technology
The develop rapidly of the communication technology and extensive use make network size huge day by day, and the complexity and the isomerism of system are more outstanding, need big the increasing that contain much information that transmits on the Internet (internet).For router, need seek footpath, forwarding capability for a large amount of messages provide.In the repeating process of router, the selection of its forward-path relies on is the dynamic routing protocol OSPF/RIP (open type shortest path priority protocol/routing information protocol) etc. or the route of static configuration.In the process of routing forwarding, system can adopt the longest coupling or the routing algorithm that accurately mates.No matter adopt the sort of method, the realization of its forwarding all is the same: after receiving message, system will obtain the purpose IP address of this message, and according to this IP address search route forwarding table, transmit if find corresponding route then jump, if can not find then forwarding is similarly searched in the study of carrying out forward-path earlier then according to next of this route.In the routing forwarding process, in case the routing forwarding list item generates, the system manager just can not revise arbitrarily to the message forwarding path, like this, under the situation that network traffics increase or the relevant outgoing interface of router breaks down, the load capacity of router and performance can be subjected to the restriction of routing forwarding list item, can not provide strong service quality guarantee for some crucial Business Streams.
At present,, adopt routing mode mostly, promptly utilize tactful route to realize the load balancing of link flow based on strategy in order to address the above problem.So-called tactful route is meant when the address is sent out in next redirect that determines an IP bag, is not to determine according to purpose IP address simply, but the comprehensive considering various effects decision.Router can also select the path for packet except that with the foundation of destination address as routing according to TOS (COS) field, source and destination port numbers (higher layer applications agreement).The strategy route can realize traffic engineering to a certain extent, makes the stream of different service quality or data of different nature (voice, file transfer protocol (FTP) FTP) walk different paths.Route based on strategy provides than traditional Routing Protocol message forwarding and the stronger control ability of storage for network manager.Traditionally, the router routing table that derives from from Routing Protocol is carried out message forwarding according to destination address.Route based on strategy is stronger than traditional route, uses more flexibly, and it makes network manager and can select forward-path according to message size, application or IP source address according to destination address.Strategy can be defined as by the load balance of multi-router or the QOS (service quality) that transmits on each line according to total flow.Different with above-mentioned traditional route querying forwarding is that tactful route is the mechanism that a kind of strategy of formulating according to the user carries out Route Selection.The user can according to information such as the source address of message, destination address neatly specified circuit by, make its forwarding that covers dynamic routing protocol decision.The strategy route mainly contains following characteristics:
1, based on the selection of the forward-path of strategy;
2, by different paths is provided with the forwarding that different priority parameters can realize QOS;
3, realization is to the load balancing of flow;
4, make full use of the bandwidth of each bar link, save operation cost.
In existing network design, need consider the realization of tactful route in a lot of places.Such as, the network node that compiles in access has 2 links to be up to backbone network.Network user A can compile row access Internet on the link 1 of node device by this, the hop count of this link is 60, simultaneously also can be by link 2 visit Internet, the hop count of this link is 100, will select link 1 to visit Internet owing to open the OSPF Routing Protocol this moment, the flow of link 2 very little thereby the flow that causes link 1 is too big, this moment is for the equilibrium of load, the system manager can select the collocation strategy route that the access path of network user A is forced to visit by link 2, thereby realizes the flow load balance of network.
Above-mentioned Rendezvous Point equipment can adopt router to realize.Adopt software to realize because the message of router is transmitted, message forwarding control all needs processings that forward data packets one by one through CPU, so function that can the implementation strategy route on most of routers.The flow process of its implementation strategy route is as shown in Figure 1:
At first, based on policy configurations ACL (Access Control List (ACL)), the message classification that needs the implementation strategy route defined by the user;
Router with message reporting CPU, when CPU forwards data packets one by one, judges in the current software list item whether have tactful route after receiving message, if disposed tactful route then next jumping parameter of usage policy routing configuration E-Packets; If there is no tactful route is then directly transmitted according to the routing iinformation of purpose IP address.
Transmit because router is a software, the study that each message all needs CPU to carry out route obtains forward-path, and is therefore when this mechanism of realization, fairly simple for the management of next jumping of strategy, do not need specially this route to be managed; Simultaneously in case tactful route is revised, then the routing forwarding list item of router also can be revised thereupon, the refreshing of this strategy route that therefore can upgrade in time.
Along with development of internet technology, the user is no longer only interested in the single function of exchange of switch, the user needs switch beyond the maintenance wire-speed forwarding capability, the ability of more high-rise service application can be provided, and need and to provide strong service quality guarantee to some crucial Business Streams.But for Ethernet switch, because the particularity (one time route repeatedly exchanges) that its message is transmitted, directly transmit after the message forwarding path learning by hardware, promptly message just no longer passes through CPU (CPU) processing after definite forward-path, but directly carry out hardware-switch, this moment, CPU can not transmit control and treatment again for message, that is to say that CPU can't detect this message forwarding path and made amendment according to collocation strategy in this path, also just can't adopt the mode identical with router to realize the configured strategy route.
Summary of the invention
The object of the present invention is to provide a kind of on Ethernet switch the method for implementation strategy route, to solve the problem that prior art can't realize in Ethernet switch in the mode of implementation strategy on the router.
For this reason, the invention provides following technical scheme:
A kind of on Ethernet switch the method for implementation strategy route, described method comprises:
A, definition routing policy, according to described routing policy collocation strategy route, and set up tactful routing node chained list according to described routing policy, and set described tactful route and be the node in the described tactful routing node chained list, be two different next-hop ip address of priority of each described node configuration;
B, set up hardware routing forwarding list item according to described tactful route;
C, described Ethernet switch are transmitted message according to described hardware routing forwarding list item;
D, described hardware routing forwarding list item is safeguarded by predetermined way.
Also comprise:
A1, set the traffic classification information of described tactful route according to described routing policy;
A2, determine the flow of Different Strategies route according to the traffic classification information of described tactful route.
The traffic classification information of described tactful route comprises: user's source IP address, purpose IP address, IP protocol type, IP differentiated services coding.
A3, with each node in the described tactful routing node chained list corresponding to a tactful route.
Described step B comprises:
B1, obtain node in the described tactful routing node chained list respectively;
B2, judge successively by described priority whether the different next-hop ip address of two priority of described node correspondence can reach;
B3, first next-hop ip address that can reach are set to effective status;
B4, with the path of the next-hop ip address of the effective status of described each node correspondence as described tactful route corresponding hardware routing forwarding list item.
Described step C comprises:
C1, reception message;
C2, according to the described tactful route of the purpose IP address search of described message;
C3, when described purpose IP address configuration during tactful route, transmit described message according to described tactful route corresponding hardware routing forwarding list item.
Described step D comprises:
Timer is safeguarded in D1, setting;
D2, behind described timer expiry, inquire about each node in the described tactful routing node chained list successively;
Whether D3, the next-hop ip address that detects two different priorities of described node correspondence respectively can reach and current state;
D4, reach and be the next-hop ip address of effective status hardware routing forwarding list item as described node corresponding strategy route with current;
If the next-hop ip address of described two different priorities of D5 is all unreachable, it is invalid that described node corresponding strategy route then is set.
By above technical scheme provided by the invention as can be seen, the present invention is by adopting the redirected characteristic implementation strategy route of traffic classification, and transmit characteristics according to the message of Ethernet switch, regularly detect also each node state of the tactful route of refresh configuration by CPU, realize maintenance tactful route.Make system provide high-quality network service, but also guaranteed the wire-speed forwarding capability of Ethernet switch for the user.In addition, each node of tactful route is provided with the routing management node of different priorities respectively and carries out dynamic refresh by CPU, reached the redundancy backup of tactful route, guaranteed the stable operation of network.
Description of drawings
Fig. 1 is the flow chart of router implementation strategy route in the prior art;
Fig. 2 is the flow chart of the present invention's implementation strategy route on Ethernet switch;
Fig. 3 is the tactful routing node list structure schematic diagram of setting up in the inventive method;
Fig. 4 is that the next-hop ip address of tactful route is provided with flow chart in the inventive method;
Fig. 5 is the forwarding process figure of tactful route in the inventive method;
Fig. 6 is to the flow chart of safeguarding of hardware converting route in the inventive method.
Embodiment
Core of the present invention is by traffic classification mode collocation strategy route, and each tactful route of system configuration mode by chained list is backed up.When the implementation strategy route, according to user's requirement definition strategy accordingly, differentiation need be carried out the flow of tactful route, specify corresponding business flow to walking along the street by strategy transmit.And regularly detect the also tactful route of refresh configuration by CPU, realize maintenance tactful route.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 2, Fig. 2 is the flow chart of the present invention's implementation strategy route on Ethernet switch, may further comprise the steps:
Step 201: definition routing policy.
The present technique field personnel know, tactful route provides a kind of like this mechanism: carry out message forwarding according to the standard that network manager is formulated.
Therefore, at first to define routing policy during the collocation strategy route; And then according to routing policy collocation strategy route.Simultaneously, also to set the traffic classification information of tactful route according to routing policy; According to the traffic classification information of tactful route, wait to determine the flow of Different Strategies route such as user's source IP address, purpose IP address, IP protocol type, IP differentiated services coding.
That is to say to define corresponding strategy according to user's real needs, the definition of this strategy has following several:
As can distinguishing the flow that need carry out tactful route based on user's source IP address, purpose IP address, IP protocol type, IP DSCP byte field such as (differentiated services codings), specify corresponding business flow to walking along the street by strategy transmit.
Because the message forwarding characteristics of Ethernet switch are different from router to the message forwarding process, therefore, the present invention also realizes backup to tactful route by the mode of setting up tactful routing node chained list according to routing policy, that is to say that each the tactful route to configuration backs up with chained list, to guarantee effective forwarding of tactful route.
Promptly enter step 202: set up tactful routing node chained list according to routing policy.
The process that the tabulation of strategy routing node is set up is as follows:
(1) the tactful route of setting is the node in the tactful routing node chained list;
(2) be two different next-hop ip address of priority of each described node configuration.
The tactful routing node list structure of setting up is as shown in Figure 3:
The IP address (NHP) of two next jumpings that each tactful routing configuration priority is different is respectively NHP1 and NHP2, and each tactful route shows as a node (NODE) on chained list simultaneously.
With each node in the tactful routing node chained list corresponding to a tactful route, that is:
Node 1 is corresponding to tactful route 1, the IP address of two next jumpings that the priority that is this strategy routing configuration simultaneously is different: the NHP2 of the NHP1 of tactful route 1 and tactful route 1;
Node 2 is corresponding to tactful route 2, the IP address of two next jumpings that the priority that is this strategy routing configuration simultaneously is different: the NHP2 of the NHP1 of tactful route 2 and tactful route 2;
Equally, node N is corresponding to tactful route N, the IP address of two next jumpings that the priority that is this strategy routing configuration simultaneously is different: the NHP2 of the NHP1 of tactful route N and tactful route 2.
Like this, just can set up hardware routing forwarding list item according to the configured strategy route.If user's message need carry out tactful route, then carry out message and transmit according to this hardware routing forwarding list item.
The foundation of hardware routing forwarding list item is finished by following steps 203 to the process of step 206:
Step 203: the node in the difference acquisition strategy routing node chained list;
Step 204: whether the different next-hop ip address of two priority of according to priority judging described node correspondence successively can reach;
Step 205: first next-hop ip address that can reach is set to effective status;
Step 206: with the path of the next-hop ip address of the effective status of each node correspondence as described tactful route corresponding hardware routing forwarding list item.
Be example with tactful routing node tabulation shown in Figure 3 still, the next-hop ip address of tactful route is provided with flow process as shown in Figure 4:
Before the Provisioning Policy route, at first need the judgement that whether can reach is carried out in next jumping (NHP) of institute's configured strategy route, two next-hop ip address that priority is different according to each node configuration, judge according to priority order from high to low whether next-hop ip address can reach, the effective route of next-hop ip address conduct of selecting high priority and can reaching.
By this figure as can be seen, for two NHP addresses of configuration, the priority of NHP1 is higher than the priority of NHP2.This next-hop ip address is effective when NHP1 exists, and does not consider the accessibility of NHP2 this moment.If there is not the route that can reach in NHP1, then continuing to judge whether NHP2 can reach, be current effective strategy routing address if can reach then NHP2 is set, otherwise it is invalid that this strategy route is set, to meet this tactful message and carry out discard processing, impact CPU to prevent these messages.
Like this, as stated above each node in the described tactful route is judged,, just can be set up tactful route corresponding hardware routing forwarding list item according to this IP address so that obtain the effective next-hop ip address of this node corresponding strategy route.
In case the setting of tactful route is finished, and set up hardware routing forwarding list item, then system just can carry out message forwarding according to this hardware routing forwarding list item when carrying out routing forwarding.
Enter step 207: Ethernet switch is transmitted message according to hardware routing forwarding list item.
At first can search whether disposed tactful route,, then transmit according to the relevant information of the next-hop ip address of the tactful routing configuration that finds if be provided with according to the purpose IP address of the message that receives.If there is not the Provisioning Policy route, then this message will continue to search route forwarding table, handles according to next jumping in the route forwarding table.
Concrete tactful routing forwarding flow process as shown in Figure 5.
The present technique field personnel know, Ethernet switch is the equipment with three layers of function of exchange, be a layer 2 switch that has the 3rd layer of routing function, but it is the combination of the two, is not simply the hardware of router device and software to be superimposed upon on the LAN switch.
Its principle is:
Suppose that two are used website A, the B of IP agreements to communicate by layer-3 switch, send website A when beginning to send, the IP address at oneself IP address and B station relatively, judge B whether stand with oneself in same subnet.If point of destination B and the A of dispatching station then carry out two layers forwarding in same subnet.If two websites not in same subnet, will be communicated by letter with point of destination B as the A of dispatching station, the A of dispatching station will send ARP (address resolution) package to " default gateway ", and the IP address of " default gateway " is three layers of Switching Module of three-tier switch in fact.When the A of dispatching station broadcasts out ARP request to the IP address of " default gateway ", if known MAC (medium access control) address at B station, the MAC Address of then replying B in the former communication process of three layers of Switching Module to the A of dispatching station.Otherwise three layers of Switching Module are asked to ARP of B station broadcasting according to routing iinformation, the B station obtains this ARP request back and replys its MAC Address to three layers of Switching Module, three layers of Switching Module are preserved this address and are replied to the A of dispatching station, and the MAC Address with the B station sends in the mac address table of two layers of switching engine simultaneously.From now on, just all give two layers of exchange processing when the packet that A sends to B, information is able to exchange at a high speed.Be a so-called routing, repeatedly exchange.
Ethernet switch adopts ASIC (application-specific integrated circuit (ASIC)) chip mostly, and the employing hardware mode is carried out searching of routing table and refreshed.After data are received into by the port interface chip, at first in two layers of exchange chip, search the corresponding target MAC Address, if find, just carry out two layers of forwarding, otherwise data are delivered to three layers of engine.In three layers of engine, asic chip is searched corresponding routing table information, compares with the purpose IP address of data, send the ARP packet then to destination host, obtain the MAC Address of this main frame, MAC Address is dealt into two layers of chip, transmit this packet by two layers of chip.
Because the route of network is among the continuous renewal, the route of the IP address NHP of next jumping of strategy routing configuration may change, in order to manage the NHP address of these tactful routes effectively, the present invention safeguards hardware routing forwarding list item, the tactful route that this forwarding-table item is remained valid by the variation of regularly inquiring about these tactful routes.
Therefore, enter step 208: hardware routing forwarding list item is safeguarded by predetermined way.
Maintenance process to hardware routing forwarding list item is as follows:
At first, set and safeguard timer, the timing query time of this timer can be set according to system's needs at interval, and adjustable.
Timing cycle of every afterwards mistake, system will initiatively carry out routing inquiry to each routing node that is kept in the tactful route chained list successively, promptly behind timer expiry, each node in the query strategy routing node chained list successively.
Then, whether the next-hop ip address that detects two different priorities of each node correspondence respectively can reach and current state;
Can reach if having in the next-hop ip address of two different priorities of this node correspondence, according to priority order judges whether this next-hop ip address that can reach is effective route again, if not effective route, then it is set to effective route, and, upgrade this strategy route corresponding hardware routing forwarding list item with the hardware routing forwarding list item of this next-hop ip address as this node corresponding strategy route.
If the next-hop ip address of two different priorities of this node correspondence is all unreachable, it is invalid that this node corresponding strategy route then is set, and upgrades this strategy route corresponding hardware routing forwarding list item.
When receive meet this tactful message after, can only abandon this message.
Above-mentioned query steps to single tactful routing node is as shown in Figure 6:
Step 600: regularly the query node route changes;
Step 601: whether the NHP1 that judges this node can reach;
If NHP1 can reach, then enter step 602: judge further whether NHP1 is current effective route;
If then enter step 608: withdraw from querying flow.At this moment, do not need this strategy route corresponding hardware forwarding-table item is upgraded.
If not, then enter step 603: it is current effective route that NHP1 is set;
Then, enter step 608: withdraw from querying flow.At this moment, need upgrade this strategy route corresponding hardware forwarding-table item according to Query Result.
If NHP1 is unreachable, then enter step 604: whether the NHP2 that further judges this node can reach;
If NHP2 can reach, then enter step 605: judge further whether NHP2 is current effective route;
If then enter step 608: withdraw from querying flow.At this moment, do not need this strategy route corresponding hardware forwarding-table item is upgraded.
If not, then enter step 606: it is current effective route that NHP2 is set;
Then, enter step 608: withdraw from querying flow.At this moment, need upgrade this strategy route corresponding hardware forwarding-table item according to Query Result.
If NHP2 is unreachable, then enter step 607: it is invalid that this node corresponding strategy route is set;
Then, enter step 608: withdraw from querying flow.At this moment, need upgrade this strategy route corresponding hardware forwarding-table item according to Query Result.Because should the strategy route invalid, this strategy route corresponding hardware forwarding-table item of described deletion, maybe this list item be set to invalid.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (6)
1. the method for an implementation strategy route on Ethernet switch is characterized in that, described method comprises:
A, definition routing policy, according to described routing policy collocation strategy route, and set up tactful routing node chained list according to described routing policy, and set described tactful route and be the node in the described tactful routing node chained list, be two different next-hop ip address of priority of each described node configuration;
B, set up hardware routing forwarding list item according to described tactful route, this step comprises:
B1, obtain node in the described tactful routing node chained list respectively;
B2, judge successively by described priority whether the different next-hop ip address of two priority of described node correspondence can reach;
B3, first next-hop ip address that can reach are set to effective status;
B4, with the path of the next-hop ip address of the effective status of described each node correspondence as described tactful route corresponding hardware routing forwarding list item;
C, described Ethernet switch are transmitted message according to described hardware routing forwarding list item;
D, described hardware routing forwarding list item is safeguarded by predetermined way.
2. according to claim 1 on Ethernet switch the method for implementation strategy route, it is characterized in that, also comprise after the described A:
A1, set the traffic classification information of described tactful route according to described routing policy;
A2, determine the flow of Different Strategies route according to the traffic classification information of described tactful route.
3. method according to claim 2 is characterized in that, the traffic classification information of described tactful route comprises: user's source IP address, purpose IP address, IP protocol type, IP differentiated services coding.
4. according to claim 1 on Ethernet switch the method for implementation strategy route, it is characterized in that described steps A comprises:
A3, with each node in the described tactful routing node chained list corresponding to a tactful route.
5. according to claim 4 on Ethernet switch the method for implementation strategy route, it is characterized in that described step C comprises:
C1, reception message;
C2, according to the described tactful route of the purpose IP address search of described message;
C3, when described purpose IP address configuration during tactful route, transmit described message according to described tactful route corresponding hardware routing forwarding list item.
6. according to claim 4 on Ethernet switch the method for implementation strategy route, it is characterized in that described step D comprises:
Timer is safeguarded in D1, setting;
D2, behind described timer expiry, inquire about each node in the described tactful routing node chained list successively;
Whether D3, the next-hop ip address that detects two different priorities of described node correspondence respectively can reach and current state;
D4, reach and be the next-hop ip address of effective status hardware routing forwarding list item as described node corresponding strategy route with current;
If the next-hop ip address of described two different priorities of D5 is all unreachable, it is invalid that described node corresponding strategy route then is set.
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