CN102857422A - System and method for realizing OLT voice double upper-link protection based on OSPF routing protocol - Google Patents
System and method for realizing OLT voice double upper-link protection based on OSPF routing protocol Download PDFInfo
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Abstract
The invention discloses a system and a method for realizing OLT (Optical Line Terminal) voice double upper-link protection based on OSPF (Open Shortest Path First Interior Gateway Protocol) routing protocol, and relates to the field of PON (Passive Optical Network). A CPU of an OLT master control panel in the system comprises an OSPF module and an RTM (Running Timer Meter) module. Two upper-link ports of an OLT are respectively connected with a NGN (Next Generation Network) through three-layer exchangers A and B to connect with a remote-end MGC (Media Gateway Controller) server; paths A and B are formed between the OLT and the MGC server; the OLT and the three-layer exchangers A and B are respectively configured with the OSPF protocols and operate; the OLT learns the routes of all network sections on the paths A and B through the OSPF route protocol; the OSPF module stores the learnt routes in the route table of the OSPF module and announces the learnt routes to the RTM module; and the RTM modules collects the route items and writes the route items in an RIB table. When a main link breaks, the OSPF route protocol learns the route of a backup link and carries out rapid protective rearrangement to the high real-time voice business among internetworking nodes.
Description
Technical field
The present invention relates to PON (Passive Optical Network; EPON) field; particularly relate to a kind of based on OSPF (Open Shortest Path First; ospf) Routing Protocol is realized the system and method for the two first line of a couplet protections of OLT (Optical Line Tterminal, optical line terminal) voice.
Background technology
Along with the progress of society and the development of network, people are also more and more stronger to the dependence of network, and it is more and more outstanding that the high reliability demand of network also shows, in case any fault appears in network, will cause immeasurable impact to people's normal life and work.So how making up a safety, stable network becomes primary, the crucial problem that operator and equipment vendor face.
The network protection ability is the self-healing feature of network, possesses the network of protective capability in infrastructure, when breaking down such as node device and link etc., can not affect or affect as little as possible normal use and the service bearer of network.Protective capability is the very important core competence of carrier class Ethernet, so be its key character that becomes " carrier class " technology.At present in our PON network protection; the main equipment redundancy protecting that adopts; equipment redundancy protecting comprises the protection of united dish link aggregation, power-supply device redundancy protecting on traditional OLT equipment trunk optical fiber redundancy protecting, main control unit redundancy protecting, the OLT equipment; and for the special requirement of broadband user and bearer service, the follow-up demand that has proposed again the two first line of a couplet protections of OLT equipment.The networking technology of the two first line of a couplet protections of OLT equipment also is one of application networking commonly used at present, and it can be in the situation that link occurs fault, by the reliability of switching to improve network of main/slave link.Under normal circumstances, flow in case when active link breaks down, in time flow switch is arrived reserve link, improves the reliability of Internet Transmission with this by primary link.
Application number is 200910130939.9 Chinese invention patent application " a kind of method of protecting uplink plate card of carrier-grade broadband access equipment ", proposed a kind of configure simple, expense is little, several milliseconds of schemes that just can realize switching fast, this protection is a kind of of link layer protected mode, it has many advantages, but it is only applicable to local area network (LAN) inside, is based on OLT and realizes as a two-layer equipment; On the other hand, based on the protection of Ethernet level, need to consider the mode of networking, otherwise may make up Ethernet Cheng Huan, cause broadcast storm.And according to development trend of today; OLT is mostly to be as a three-layer equipment, and traditional PON system can realize speech business, but can't realize at three-layer equipment the network protection switching of internet high real-time speech business; in case link breaks down, will cause great impact to the user.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology; a kind of system and method for realizing the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol is provided; when active link opens circuit; IP based network layer OSPF Routing Protocol still may learn the route of reserve link; between internet node, quick protective switch is carried out in the high real-time speech business, finally realize two first line of a couplet protections of speech business.
The system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol provided by the invention; comprise the OLT and the far-end MGC server that link to each other with the Telnet/Console/ webmaster; also comprise three-tier switch A; three-tier switch B and NGN net; the main control unit of described OLT comprises CPU and exchange chip; described CPU comprises OSPF module and RTM module; the NGN net is linked by three-tier switch A and three-tier switch B respectively in two upper united mouths of OLT; and then link far-end MGC server; pathway a and path b between OLT and MGC server; at OLT; configure respectively ospf protocol on three-tier switch A and the three-tier switch B; it is moved; OLT acquires the route of path a and upper all network segments of path b simultaneously by the OSPF Routing Protocol; the OSPF module is kept at its route of acquiring in the routing table of oneself; and announce to the RTM module, the RTM module collects these route entrys and writes the RIB table.
In technique scheme, the CPU of the main control unit of described OLT comprises that also configuration adaptation layer, ICP/IP protocol stack, MUX layer, three layer interface modelings, exchange chip drive, comprise the order line processing module that links to each other with the Telnet/Console/ webmaster in the described configuration adaptation layer, the OSPF module is mutual with order line processing module, ICP/IP protocol stack, RTM module respectively, mutual in twos between ICP/IP protocol stack, RTM module, the MUX layer, the MUX layer also drives mutual by three layer interface modelings and exchange chip; Exchange chip drives with exchange chip and links to each other, exchange chip comprises ACL module, two-layer retransmitting table and three layer retransmitting tables, the OSPF module is registered the transmitting-receiving rule of some protocol massages to the ACL module in the exchange chip, the ACL module again with this rule downloading to exchange chip, after exchange chip is received packet, only legal wrapping delivered to CPU, the Bao Ze that does not meet rule abandons; Mutual by with ICP/IP protocol stack and RTM module of OSPF module, and other bottom modules is auxiliary, finally realizes study and the management of OSPF route, and realizes three layers of forwarding of packet.
In technique scheme, described OSPF module comprises protocol process module, the interface management module that links to each other with protocol process module respectively, routing module, packet handing module and command interface module, the RTM module comprises interface message processing module and dynamic routing message processing module, wherein, interface management module and the interface message processing module in the RTM module in the OSPF module are mutual, dynamic routing message processing module in routing module in the OSPF module and the RTM module is mutual, the ICP/IP protocol stack of the packet handing module in the OSPF module and OSPF module-external is mutual, command interface module in the OSPF module and the order line/network management communication of OSPF module-external are to keep the normal operation of ospf protocol.
In technique scheme, the interface management module in the described OSPF module is externally communicated by letter with the interface message processing module of RTM module, obtains the variation of physical layer interface ports physical connection status; Internally communicate by letter with protocol process module, the Interface status that will obtain from bottom is carried out the transfer processing of state again with the interface state machine of offering protocol process module of corresponding event in form by interface state machine.
In technique scheme, routing module in the described OSPF module is externally communicated by letter with the dynamic routing message processing module of RTM module, to send the mode of message, increase or the deletion event of route are informed the module to RTM, the RTM module is upgraded the RIB table that it is safeguarded, and using corresponding algorithm to upgrade the fib table of operating system, this fib table is the relevant forwarding information of best route affix that the RTM module chooses from the RIB table, sends network packet for the ICP/IP protocol stack; Fib table in the final updating exchange chip high-speed cache is finally realized the synchronous of software route and hardware route; Routing module internally and protocol process module communicate, protocol process module calculates the route of receiving, and corresponding result is passed to routing module.
In technique scheme, described routing module is safeguarded a new routing table and Geju City routing table, by contrasting new and old routing table, non-existent route entry in existence, the old routing table in the new routing table is added old routing table; Route for not existing in the new routing table, existing in the old routing table arranges corresponding timer, after timer expiry, this route entry is deleted from old routing table.
In technique scheme, packet handing module in the described OSPF module is externally communicated by letter with the ICP/IP protocol stack, be responsible for to receive and send the ospf protocol bag, by with the message interaction of opposite end ospf router, learning network is topological, forms the LSD of oneself; Packet handing module is internally communicated by letter with neighbor state machine, the interface state machine of protocol process module, and neighbor state machine, interface state machine all trigger described packet handing module and assemble corresponding OSPF bag, and this bag is sent; Packet handing module will be processed the ospf protocol bag of receiving, generate corresponding event, and trigger the neighbor state machine, interface state machine carries out state transitions or route re-computation.
In technique scheme, comprise hello packet, Data Description (DD) packet, link state request packet, link state update packet, LS ACK message in the described ospf protocol bag, hello packet is used for foundation and maintenance of neighbor relation; Data Description (DD) packet is used for the summary info of descriptive data base; Link state request packet is used for request neighbours' database details; Link state update packet is used for sending detailed link-state information), LS ACK message is used for confirming the other side's link state update message.
In technique scheme, command interface module in the described OSPF module externally receives the configuration that issues from the order line processing module, perhaps the configure/status that equipment is current reports the order line processing module, and then reports order line or webmaster by the order line processing module; The command interface module is internally communicated by letter with protocol process module, inputs some parameters to protocol process module, perhaps obtains its current configuration and state information from protocol process module, thereby realizes management and control to OSPF.
In technique scheme, described RIB table comprises three sublists: the route information table RIB-pend of the route information table RIB-active of current activation, alternate routing information table RIB-standby, temporary suspension, the RIB-active table is used for storing route that acquire by variety of protocol or the current activation that other modes obtain, this route is written among the FIB of hardware FIB and operating system and goes, and a destination network segment only has an active route; RIB-standby table is used for storing and can reaches but be not the alternate routing of optimal path, only has when the route in the RIB-active table is unavailable, and the RTM module just can select an optimum route that it is upgraded to the active route in RIB-standby; The RIB-pend table is used for storing the route of temporary suspension because the down hop gateway address is unreachable, and when the down hop gateway address can reach, this route can be upgraded and be standby route or active route.
In technique scheme, described RTM module is by judging the route entry of receiving, different qualities according to route entry writes it in above-mentioned different sublist, then in the RIB-active table, select best route to enclose relevant forwarding information, write in the network segment routing table of exchange chip, the RTM module is regularly inquired about the ARP table of ICP/IP protocol stack simultaneously, and compare with oneself main frame routing table, if find the new main frame route that reaches, then this route write in the hardware host routing table; Route has not existed if send out existing, then in the main frame routing table of oneself with the deletion of corresponding route, and this route in the deletion hardware host routing table, guarantee software route and hardware route synchronously, equipment and network change synchronous; Three layer interface tables, main frame routing table and network segment routing table in the exchange chip consist of the hardware fib table jointly, finally realize three layers of forwarding of Business Stream.
In technique scheme, described OLT also links to each other with ONU, two voice user c and d are arranged under the described ONU, user c and user d send the control signal that transmits based on IP and arrive after the OLT, the route of learning according to OSPF at OLT finds three-tier switch A or B, and three-tier switch is sent to MGC with this message through the NGN bearer network again, realizes the registration of user c and d, set up one from user c to the duplex channel the user d, realize the voice intercommunication of user c and user d according to call flow.
In technique scheme, described OLT has two equative route a and b to the MGC server, OSPF module among the OLT is learnt the identical equal-cost route in address of two clauses and subclauses simultaneously, the OSPF module with its study to two equal-cost routes all inform the module to RTM, the RTM module is filtered two equal-cost routes by series of algorithms and is selected.
In technique scheme, described RTM module is filtered with the process of selecting as follows by series of algorithms to two equal-cost routes: if the OSPF module is acquired first the route of path a, then this route is write routing table entry, and announcement is to the RTM module, after the RTM module is received this route, inquire about the routing table of oneself, find not exist before this route, so it is write RIB table, and upgrades simultaneously fib table in the operating system and the fib table of exchange chip; Learn as OSPF after the route of path b, this route is written in the routing table of OSPF module oneself preservation equally, the route of the route of path a and path b is of equal value at this moment, to after the RTM module, process the route of path b according to the algorithm of oneself by the RTM module with the advertising of route of path b for the OSPF module.
Based on said system, the present invention also provides a kind of method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol, and the processing of described RTM module parity price route may further comprise the steps: the RTM module receive the path b that the OSPF module is sent route entry write message; The RTM module judges that purpose IP address is identical with mask in the route entry that has existed in the purpose IP address and mask and its RIB table in this route entry, and when existence is for the route entry that activates, the ARP table of RTM module query manipulation system; The down hop gateway address that the RTM module is judged current route compares down hop gateway address and the current route that writes route in the ARP table time; The RTM module judges that the down hop gateway address write route is different from the gateway of current activation route, and the current route that writes is not when being not more excellent, and the route entry that the RTM module writes is set to stand-by state, and writes during RIB-Standby shows.
In technique scheme, the processing of described RTM module parity price route is further comprising the steps of: described RTM module judges that purpose IP address is identical with mask in the route entry that has existed in the purpose IP address and mask and its RIB table in this route entry, and when existence is not for the route entry that activates, whether is present in according to the down hop gateway address in the ARP table of operating system and does different disposal.
In technique scheme, whether the processing of described RTM module parity price route is further comprising the steps of: described RTM module is judged in the route entry that has existed in the purpose IP address and mask and its RIB table in this route entry purpose IP address and mask not simultaneously, be present in according to the down hop gateway address in the ARP table of operating system to do different disposal.
In technique scheme, the processing of described RTM module parity price route is further comprising the steps of: the down hop gateway address that described RTM module is judged current route is set to suspended state with the route entry state that writes, and writes the RIB table not in the ARP table time.
In technique scheme, the processing of described RTM module parity price route is further comprising the steps of: described RTM module judges that the down hop gateway address of current route is in the ARP table, and when the down hop gateway address that writes route is identical with the gateway of current active route, the route entry state that writes is set to suspended state, and writes the RIB table.
In technique scheme, the processing of stating RTM module parity price route is further comprising the steps of: described RTM module judges that the down hop gateway address that writes route is different from the gateway of current activation route, and when the current route that writes is more excellent, the route entry state that writes is set to state of activation is written to the RIB table, and the route entry state of current activation is set to stand-by state.
In technique scheme, further comprising the steps of: after the route entry state of current activation was set to stand-by state, the original route that activates of deletion in the table of operating system was with the fib table of the current route write operation system that writes.
In technique scheme, further comprising the steps of: behind the fib table with the current route write operation system that writes, the route of the former activation of deletion writes the current route that writes in the fib table of exchange chip in exchange chip.
In technique scheme, further comprising the steps of: when active link opened circuit, the OSPF that is embodied as that the protection of high real-time speech business is switched relearned route, reaches the process that the RTM module is write the RIB table again.
In technique scheme, the realization that the protection of described high real-time speech business is switched may further comprise the steps: if the link of path a opens circuit, the OSPF module perceives network topology variation has occured, relearn immediately network topology, and the routing table that will oneself preserve is before all wiped, then the route that will newly acquire writes the routing table of oneself, and announcement is to the RTM module; The RTM module is all wiped RIB table before, again write the RIB table according to the route of new announcement, at this moment the route of path b then becomes the active route and is written into RIB-active table, and then writes the fib table of operating system and the fib table of exchange chip, realizes that three layer services stream transmits at path b.
In technique scheme, the message that writes of described route entry comprises static routing and dynamic routing.
In technique scheme, described RTM module judges by comparing jumping figure whether the current route that writes is more excellent.
Compared with prior art, advantage of the present invention is as follows:
One aspect of the present invention is utilized distinctive equivalent multipath route learning characteristic; realize ospf protocol at OLT; adopt on the other hand specific network construction form; between source and destination, set up two equative routes; do not need to be concerned about two layers of link; what grade exchange/transmission equipments of process in the middle of also not needing to be concerned about; when active link opens circuit; IP based network layer OSPF Routing Protocol still may learn the route of reserve link; between internet node, quick protective switch is carried out in the high real-time speech business, finally realize two first line of a couplet protections of speech business.Certainly, if do not consider factor of equal value, equally also can as required, take many first line of a couplet protections.
Description of drawings
Fig. 1 is the software architecture figure with the OLT main control unit system of OSPF function.
Fig. 2 is the structured flowchart of realizing the system of the two first line of a couplet protections of OLT voice in the embodiment of the invention based on the OSPF Routing Protocol.
Fig. 3 is the networking structure schematic diagram of the two first line of a couplet protections of OSPF in the embodiment of the invention.
Fig. 4 is the process chart of RTM module parity price route in the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and the specific embodiments.
The key of the embodiment of the invention is to realize the specific group net mode of OSPF Routing Protocol and two first line of a couplet at OLT, thereby realizes the protection to the real-time voice business.
OSPF is a kind of link-state routing protocol, and it is designed to single AS (Autonomous System, autonomous system).Each ospf router is being kept identical database with the topological structure of description AS, and creates shortest path tree and calculate routing table with this database.After OSPF finds topology change, only utilize routing traffic seldom just can recomputate fast the path that makes new advances.OSPF provides study and the computing function of equivalent multipath route.By zone routing is provided, extra trail protection is provided, and can reduces the needed flow of agreement.In addition, checking is all passed through in all ospf routing information exchanges, has therefore more improved fail safe.
To realize in the PON system that the two first line of a couplet of OSPF and then realization to the real-time guard of speech business, so at first must realize ospf protocol at OLT.
Referring to shown in Figure 1; the embodiment of the invention provides a kind of system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol; comprise and OLT that Telnet (remote login service)/Console (serial ports)/webmaster links to each other; the main control unit of OLT comprises CPU (Central Processing Unit; central processing unit) and exchange chip, the OSPF Model Implement is arranged in the CPU of OLT main control unit.The CPU of OLT main control unit comprises the configuration adaptation layer, the OSPF module, TCP/IP (Transmission Control Protocol/Intemet Protocol, transmission control protocol/Internet Interconnection agreement) protocol stack, RTM (Route Table Manage, routing management) module, MUX (Mutiplexer, multiplexing) layer, L3Interface (three layer interfaces) modeling, SDK (Software Development Kit, exchange chip drives), comprise the order line processing module that links to each other with the Telnet/Console/ webmaster in the configuration adaptation layer, the OSPF module respectively with the order line processing module, the ICP/IP protocol stack, the RTM module is mutual, the ICP/IP protocol stack, the RTM module, mutual in twos between the MUX layer, the MUX layer also drives mutual by L3Interface modeling and exchange chip.Exchange chip drives with exchange chip and links to each other, and exchange chip comprises ACL (Access Control List, Access Control List (ACL)) module, two-layer retransmitting table and three layer retransmitting tables.
The OSPF Model Implement is based upon on the realization basis of OLT three layer interfaces, on OLT by setting up SVI (Switch Vlan Interface, exchange virtual local area network interface), make it that IP (Intemet Protocol can be provided, the Internet Interconnection agreement) ability of interface configuration and perception port status is in the situation that minimum is changed three layer interfaces of realizing OLT.The establishment of three layer interfaces mainly realizes in L3Interface modeling shown in Figure 1, need to realize END (Enhanced Network Driver at this one deck, the enhanced network driver) device drives, the END that the L3interface modeling is equivalent among the Vxworks (a kind of title of operating system) drives, this END equipment is exactly to be the transceiver channel that three layer interfaces are set up message, and is articulated on the ICP/IP protocol stack.When three layer interfaces are deleted, also need to unload simultaneously END equipment.Three layer interfaces have been realized, driving function aspect also need in exchange chip drives, realizing three layers simultaneously, the OSPF module is registered the transmitting-receiving rule of some protocol massages to the ACL module in the exchange chip, the ACL module again with this rule downloading to exchange chip, therefore after exchange chip is received packet, only legal wrapping delivered to CPU, the Bao Ze that does not meet rule abandons.Mutual by with ICP/IP protocol stack and RTM module of OSPF module, and other bottom modules is auxiliary, finally realizes study and the management of OSPF route, and realizes three layers of forwarding of packet.
Referring to shown in Figure 2, the OSPF module comprises protocol process module, the interface management module that links to each other with protocol process module respectively, routing module, packet handing module and command interface module, the RTM module comprises interface message processing module and dynamic routing message processing module, wherein, interface management module in the OSPF module, routing module, packet handing module, the command interface module belongs to OSPF module and its outside mutual module, interface management module and the interface message processing module in the RTM module in the OSPF module are mutual, dynamic routing message processing module in routing module in the OSPF module and the RTM module is mutual, the ICP/IP protocol stack of the packet handing module in the OSPF module and OSPF module-external is mutual, command interface module in the OSPF module and the order line/network management communication of OSPF module-external are to keep the normal operation of ospf protocol.
Referring to shown in Figure 2, in the OSPF module, the interface management module is externally communicated by letter with the interface message processing module of RTM module, obtains the variation of physical layer interface Up/Down state (ports physical connection status); Internally communicate by letter with protocol process module, the Interface status that will obtain from bottom is carried out the transfer processing of state again with the interface state machine of offering protocol process module of corresponding event in form by interface state machine.
Referring to shown in Figure 2, in the OSPF module, routing module is externally communicated by letter with the dynamic routing message processing module of RTM module, to send the mode of message, increase or the deletion event of route are informed the module to RTM, therefore the RTM module upgrades RIB (the Routing Information Base that it is safeguarded, route information table) table, and use corresponding algorithm to upgrade FIB (the Forwarding Information Base of operating system, the forwarding information table) table, this fib table is the relevant forwarding information of best route affix that the RTM module chooses from the RIB table, such as next hop address, the forwarding information table that outgoing interface information etc. combines sends network packet for the ICP/IP protocol stack; Fib table in the final updating exchange chip high-speed cache is finally realized the synchronous of software route and hardware route.Routing module internally and protocol process module communicate, protocol process module calculates the route of receiving, and corresponding result is passed to routing module.Routing module need to be safeguarded two routing tables, and one is new routing table, and one is old routing table, by contrasting new and old routing table, non-existent route entry in existence, the old routing table in the new routing table is added old routing table; Route for not existing in the new routing table, existing in the old routing table arranges corresponding timer, after timer expiry, this route entry is deleted from old routing table.
Referring to shown in Figure 2, in the OSPF module, packet handing module is externally communicated by letter with the ICP/IP protocol stack, be responsible for to receive and send the ospf protocol bag, by with the message interaction of opposite end ospf router, the learning network topology forms oneself LSD.Comprise hello packet (handshake message), DD (Database Description in the ospf protocol bag, database summary) message, LSR (Link State Request, the Link State request) message, LSU (Link State Update, link state update) message, LS ACK (Link State Acknowledgement, link state acknowledgment) message, hello packet is used for foundation and maintenance of neighbor relation; Data Description (DD) packet is used for the summary info of descriptive data base; Link state request packet is used for request neighbours' database details; Link state update packet is used for sending detailed link-state information), the LS_ACK message is used for confirming the other side's link state update message.
Packet handing module is internally communicated by letter with neighbor state machine, the interface state machine of protocol process module, and on the one hand, neighbor state machine, interface state machine all trigger this packet handing module and assemble corresponding OSPF bag, and this bag is sent; On the other hand, packet handing module will be processed the ospf protocol bag of receiving, generate corresponding event, and trigger the neighbor state machine, interface state machine carries out state transitions or route re-computation etc.
Referring to shown in Figure 2, in the OSPF module, the command interface module externally receives the configuration that issues from the order line processing module, and perhaps the configure/status that equipment is current reports the order line processing module, and then reports order line or webmaster by the order line processing module; The command interface module is internally communicated by letter with protocol process module, inputs some parameters to protocol process module, perhaps obtains its current configuration and state information from protocol process module, thereby realizes management and control to OSPF.
In OLT, realize the OSPF module, and utilized the characteristic of its equivalent multipath, designed the two first line of a couplet networkings of OSPF shown in Figure 3, realized two first line of a couplet protections of speech business.
Referring to shown in Figure 3; realize the system of the two first line of a couplet protections of OLT voice in the embodiment of the invention based on the OSPF Routing Protocol; comprise the OLT that links to each other with the Telnet/Console/ webmaster; three-tier switch A; three-tier switch B; NGN (Next Generation Network; next generation network) net and MGC (Media Gateway Controller; Media Gateway Controller) server; the main control unit of OLT comprises CPU and exchange chip; wherein CPU comprises OSPF module and RTM module; the NGN net is linked by three-tier switch A and three-tier switch B respectively in two upper united mouths of OLT; and then link far-end MGC server, pathway a and path b between OLT and MGC server.The Port IP of each equipment configures respectively ospf protocol referring to shown in Figure 3 on OLT, three-tier switch A and three-tier switch B, it is moved.OLT has acquired all network segments on path a and the path b simultaneously by the OSPF Routing Protocol, and the OSPF module is kept at its route of acquiring in the routing table of oneself, and announcement is to the RTM module, and the RTM module collects these route entrys and writes the RIB table.
The RIB table comprises three sublist: RIB-active (Routing Information Base active, the route information table of current activation), RIB-standby (Routing Information Base standby, the alternate routing information table) and RIB-pend (Routing Information Base standby, the route information table of temporary suspension) table.RIB-active table is used for storing route that acquire by variety of protocol or the current activation that other modes obtain, and this route can be written among the FIB of hardware FIB and operating system and go, and a common destination network segment only has an active route.RIB-standby table is used for storing and can reaches but be not the alternate routing of optimal path, only have when the route in the RIB-active table is unavailable, the RTM module just can select an optimum route that it is upgraded to active (current activation) route in RIB-standby.The RIB-pend table is used for storing the route of temporary suspension because the down hop gateway address is unreachable, and when the down hop gateway address can reach, this route can be upgraded and be standby (for subsequent use) route or active (current activation) route.
The RTM module is by judging the route entry of receiving, different qualities according to route entry writes it in above-mentioned different sublist, then in the RIB-active table, select best route to enclose relevant forwarding information, next bar address for example, outgoing interface name etc., write in the network segment routing table of exchange chip, the RTM module also can regularly remove to inquire about ARP (the Address Resolution Protocol of ICP/IP protocol stack simultaneously, address resolution protocol) table, and compare with oneself main frame routing table, if find the new main frame route that reaches, then this route write in the hardware host routing table; Route has not existed if send out existing, then in the main frame routing table of oneself with the deletion of corresponding route, and this route in the deletion hardware host routing table, guarantee software route and hardware route synchronously, equipment and network change synchronous.Three layer interface tables, main frame routing table and network segment routing table in the exchange chip consist of the hardware fib table jointly, finally realize three layers of forwarding of Business Stream.
Voice intercommunication between the user who realizes hanging under the ONU at first needs the voice user to send corresponding control signal and goes registration to MGC.Referring to shown in Figure 3; in the networking of the two first line of a couplet protections of OSPF; with under the ONU that OLT links to each other two voice user c and d are arranged; user c and user d will realize voice call; at first all need to be registered to MGC; set up one from user c to the duplex channel the user d by MGC, need the control signal that transmits based on IP by sending to the MGC registration.
User c and user d send the control signal that transmits based on IP and arrive after the OLT, the route of learning according to OSPF at OLT finds three-tier switch A or B, three-tier switch is sent to MGC with this message through the NGN bearer network again, realize the registration of user c and d, set up one from user c to the duplex channel the user d.After in a single day passage between user c and the user d establishes, according to call flow, can realize the voice intercommunication of user c and user d.
Referring to shown in Figure 3, OLT has two equative route a and b to the MGC server, because OSPF possesses equivalent multipath characteristic, so the OSPF module among the OLT can be learnt two equal-cost routes simultaneously, destination address is 10.0.81.130/26, can see that the route of two paths a and b is all acquired so check the routing table that OSPF learns in OLT.OSPF can with its study to two routes all inform the module to RTM, the RTM module is filtered two equal-cost routes by series of algorithms and is selected.Suppose that OSPF acquires first the route of path a, this route can be written into the routing table of oneself so, and announcement is to the RTM module, the RTM module is received the routing table that can go to look into oneself after this new route, find not exist before this route, so it is write RIB table, and upgrades simultaneously fib table in the operating system and the fib table of exchange chip.Learn as OSPF after the route of path b, this route can be written in the routing table of OSPF module oneself preservation equally, but since this moment the route of path a and the route of path b of equal value, therefore when the OSPF module with this advertising of route to the RTM module after, the RTM module can be processed this route according to the algorithm of oneself.
Referring to shown in Figure 4, the handling process of RTM module parity price route is as follows:
S1, RTM module receive the path b that the OSPF module is sent route entry write message, comprise static routing and dynamic routing;
S2, RTM module are according to dest (purpose IP address) and mask (mask), judge purpose IP address and mask in this route entry whether with its RIB table in the route entry that existed purpose IP address identical with mask, if identical, then forward step S3 to; If not identical, then forward step S4 to;
Purpose IP address is all identical with mask in the route entry that S3, RTM module find path b and the route entry in a path, judges whether that existence is the route entry of active (current activation), if existence then forwards step S5 to; If do not exist, then forward step S4 to;
S4, because the route entry of path a is not configured to active (current activation) state, therefore whether next step need to be present in the ARP table of OS according to the down hop gateway address and do different disposal (according to gateway being arranged and not having two kinds of situations of gateway to carry out respectively different disposal, do not belong to the content that the present invention will protect herein, therefore repeat no more);
S5, because the route entry of path a has been configured to active (current activation) state, the RTM module is then inquired about the ARP table of OS (Operating System, operating system), judges that the down hop gateway address of current route is whether in the ARP table, if, then forward step S6 to; If do not exist, then forward S7 to;
S6, since down hop gateway address 10.0.164.101 be present in the current ARP table, so will write down hop gateway address and the current route of route compares, judge whether the down hop gateway address that writes route is identical with the gateway of current active route, if identical, then forward step S7 to; If not identical, then forward step S8 to;
The gateway of S7, path a route is 10.0.164.97, and if the gateway of path b is identical with a, then the state with the route entry that writes is set to pend (hang-up) state, and writes the RIB table;
The gateway of S8, path a route is 10.0.164.97, and the gateway of path b is 10.0.164.101, and both are different, and relatively jumping figure (metric) judges whether the current route that writes is more excellent, if then forward step S10 to; If not, then forward step S9 to;
S9, the route entry state that writes is set to standby (for subsequent use) state is written to RIB table, namely the route entry that writes of RTM module is set to the standby state and writes in the RIB-Standby table;
S10, the route entry state that writes is set to the active state is written to RIB table, and the route entry state of the path a of current activation is set to the standby state, then forward step S11 to;
S11, in the table of OS the route of the original path a that activates of deletion, the route of the current path b that writes is write the fib table of OS, forward step S12 to;
The route of S12, deletion activates in exchange chip path a writes the route of the current path b that writes in the fib table of exchange chip.
Because the route learning characteristic of the equivalent multipath of OSPF and the special management of RTM module mechanism, make the two first line of a couplet of OSPF realize that the protection of high real-time speech business switches.When active link opens circuit, the implementation procedure that the protection of high real-time speech business is switched be the OSPF process that relearns route, and the RTM module again write the process of RIB table.
The link of supposing the path a among Fig. 3 opens circuit, the OSPF module perceives network topology variation has occured so, can relearn immediately network topology, and the routing table that will oneself preserve is before all wiped, then the route that will newly acquire writes the routing table of oneself, and announcement is to the RTM module, the RTM module also can all be wiped RIB table before, again write the RIB table according to the route of new announcement, the route of path b then became the active route and was written into RIB-active table this time, and then write the fib table of OS and the fib table of exchange chip, realize that therefore three layer services stream transmits at path b.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention comprises these changes and modification interior.The content that is not described in detail in this specification belongs to the known prior art of this area professional and technical personnel.
Claims (26)
1. system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol; comprise the OLT and the far-end MGC server that link to each other with the Telnet/Console/ webmaster; it is characterized in that: also comprise three-tier switch A; three-tier switch B and NGN net; the main control unit of described OLT comprises CPU and exchange chip; described CPU comprises OSPF module and RTM module; the NGN net is linked by three-tier switch A and three-tier switch B respectively in two upper united mouths of OLT; and then link far-end MGC server; pathway a and path b between OLT and MGC server; at OLT; configure respectively ospf protocol on three-tier switch A and the three-tier switch B; it is moved; OLT acquires the route of path a and upper all network segments of path b simultaneously by the OSPF Routing Protocol; the OSPF module is kept at its route of acquiring in the routing table of oneself; and announce to the RTM module, the RTM module collects these route entrys and writes the RIB table.
2. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 1, it is characterized in that: the CPU of the main control unit of described OLT also comprises the configuration adaptation layer, the ICP/IP protocol stack, the MUX layer, three layer interface modelings, exchange chip drives, comprise the order line processing module that links to each other with the Telnet/Console/ webmaster in the described configuration adaptation layer, the OSPF module respectively with the order line processing module, the ICP/IP protocol stack, the RTM module is mutual, the ICP/IP protocol stack, the RTM module, mutual in twos between the MUX layer, the MUX layer also drives mutual by three layer interface modelings and exchange chip; Exchange chip drives with exchange chip and links to each other, exchange chip comprises ACL module, two-layer retransmitting table and three layer retransmitting tables, the OSPF module is registered the transmitting-receiving rule of some protocol massages to the ACL module in the exchange chip, the ACL module again with this rule downloading to exchange chip, after exchange chip is received packet, only legal wrapping delivered to CPU, the Bao Ze that does not meet rule abandons; Mutual by with ICP/IP protocol stack and RTM module of OSPF module, and other bottom modules is auxiliary, finally realizes study and the management of OSPF route, and realizes three layers of forwarding of packet.
3. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 2; it is characterized in that: described OSPF module comprises protocol process module; the interface management module that links to each other with protocol process module respectively; routing module; packet handing module and command interface module; the RTM module comprises interface message processing module and dynamic routing message processing module; wherein; interface management module and the interface message processing module in the RTM module in the OSPF module are mutual; dynamic routing message processing module in routing module in the OSPF module and the RTM module is mutual; the ICP/IP protocol stack of the packet handing module in the OSPF module and OSPF module-external is mutual; command interface module in the OSPF module and the order line/network management communication of OSPF module-external are to keep the normal operation of ospf protocol.
4. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 3, it is characterized in that: the interface management module in the described OSPF module is externally communicated by letter with the interface message processing module of RTM module, obtains the variation of physical layer interface ports physical connection status; Internally communicate by letter with protocol process module, the Interface status that will obtain from bottom is carried out the transfer processing of state again with the interface state machine of offering protocol process module of corresponding event in form by interface state machine.
5. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 4, it is characterized in that: the routing module in the described OSPF module is externally communicated by letter with the dynamic routing message processing module of RTM module, to send the mode of message, increase or the deletion event of route are informed the module to RTM, the RTM module is upgraded the RIB table that it is safeguarded, and use corresponding algorithm to upgrade the fib table of operating system, this fib table is the relevant forwarding information of best route affix that the RTM module chooses from the RIB table, sends network packet for the ICP/IP protocol stack; Fib table in the final updating exchange chip high-speed cache is finally realized the synchronous of software route and hardware route; Routing module internally and protocol process module communicate, protocol process module calculates the route of receiving, and corresponding result is passed to routing module.
6. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 5, it is characterized in that: described routing module is safeguarded a new routing table and Geju City routing table, by contrasting new and old routing table, non-existent route entry in existence, the old routing table in the new routing table is added old routing table; Route for not existing in the new routing table, existing in the old routing table arranges corresponding timer, after timer expiry, this route entry is deleted from old routing table.
7. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 6, it is characterized in that: the packet handing module in the described OSPF module is externally communicated by letter with the ICP/IP protocol stack, be responsible for receiving and sending the ospf protocol bag, by with the message interaction of opposite end ospf router, learning network is topological, forms the LSD of oneself; Packet handing module is internally communicated by letter with neighbor state machine, the interface state machine of protocol process module, and neighbor state machine, interface state machine all trigger described packet handing module and assemble corresponding OSPF bag, and this bag is sent; Packet handing module will be processed the ospf protocol bag of receiving, generate corresponding event, and trigger the neighbor state machine, interface state machine carries out state transitions or route re-computation.
8. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 7, it is characterized in that: comprise hello packet, Data Description (DD) packet, link state request packet, link state update packet, LS_ACK message in the described ospf protocol bag, hello packet is used for foundation and maintenance of neighbor relation; Data Description (DD) packet is used for the summary info of descriptive data base; Link state request packet is used for request neighbours' database details; Link state update packet is used for sending detailed link-state information), the LS_ACK message is used for confirming the other side's link state update message.
9. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 8, it is characterized in that: the command interface module in the described OSPF module externally receives the configuration that issues from the order line processing module, perhaps the configure/status that equipment is current reports the order line processing module, and then reports order line or webmaster by the order line processing module; The command interface module is internally communicated by letter with protocol process module, inputs some parameters to protocol process module, perhaps obtains its current configuration and state information from protocol process module, thereby realizes management and control to OSPF.
10. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 9, it is characterized in that: described RIB table comprises three sublists: the route information table RIB-pend of the route information table RIB-active of current activation, alternate routing information table RIB-standby, temporary suspension, the RIB-active table is used for storing route that acquire by variety of protocol or the current activation that other modes obtain, this route is written among the FIB of hardware FIB and operating system and goes, and a destination network segment only has an active route; RIB-standby table is used for storing and can reaches but be not the alternate routing of optimal path, only has when the route in the RIB-active table is unavailable, and the RTM module just can select an optimum route that it is upgraded to the active route in RIB-standby; The RIB-pend table is used for storing the route of temporary suspension because the down hop gateway address is unreachable, and when the down hop gateway address can reach, this route can be upgraded and be standby route or active route.
11. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 10, it is characterized in that: described RTM module is by judging the route entry of receiving, different qualities according to route entry writes it in above-mentioned different sublist, then in the RIB-active table, select best route to enclose relevant forwarding information, write in the network segment routing table of exchange chip, the RTM module is regularly inquired about the ARP table of ICP/IP protocol stack simultaneously, and compare with oneself main frame routing table, if find the new main frame route that reaches, then this route write in the hardware host routing table; Route has not existed if send out existing, then in the main frame routing table of oneself with the deletion of corresponding route, and this route in the deletion hardware host routing table, guarantee software route and hardware route synchronously, equipment and network change synchronous; Three layer interface tables, main frame routing table and network segment routing table in the exchange chip consist of the hardware fib table jointly, finally realize three layers of forwarding of Business Stream.
12. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 11; it is characterized in that: described OLT also links to each other with ONU; two voice user c and d are arranged under the described ONU; user c and user d send the control signal that transmits based on IP and arrive after the OLT; the route of learning according to OSPF at OLT finds three-tier switch A or B; three-tier switch is sent to MGC with this message through the NGN bearer network again; realize the registration of user c and d; set up one from user c to the duplex channel the user d, realize the voice intercommunication of user c and user d according to call flow.
13. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 12; it is characterized in that: described OLT has two equative route a and b to the MGC server; OSPF module among the OLT is learnt the identical equal-cost route in address of two clauses and subclauses simultaneously; the OSPF module with its study to two equal-cost routes all inform the module to RTM, the RTM module is filtered two equal-cost routes by series of algorithms and is selected.
14. the system that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 13, it is characterized in that: described RTM module is filtered with the process of selecting as follows by series of algorithms to two equal-cost routes: if the OSPF module is acquired first the route of path a, then this route is write routing table entry, and announcement is to the RTM module, after the RTM module is received this route, inquire about the routing table of oneself, find not exist before this route, so it is write RIB table, and upgrades simultaneously fib table in the operating system and the fib table of exchange chip; Learn as OSPF after the route of path b, this route is written in the routing table of OSPF module oneself preservation equally, the route of the route of path a and path b is of equal value at this moment, to after the RTM module, process the route of path b according to the algorithm of oneself by the RTM module with the advertising of route of path b for the OSPF module.
15. the method based on the two first line of a couplet protections of OSPF Routing Protocol realization OLT voice on the described system-based of claim 14 is characterized in that, the processing of described RTM module parity price route may further comprise the steps:
The RTM module receive the path b that the OSPF module is sent route entry write message;
The RTM module judges that purpose IP address is identical with mask in the route entry that has existed in the purpose IP address and mask and its RIB table in this route entry, and when existence is for the route entry that activates, the ARP table of RTM module query manipulation system;
The down hop gateway address that the RTM module is judged current route compares down hop gateway address and the current route that writes route in the ARP table time;
The RTM module judges that the down hop gateway address write route is different from the gateway of current activation route, and the current route that writes is not when being not more excellent, and the route entry that the RTM module writes is set to stand-by state, and writes during RIB-Standby shows.
16. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 15; it is characterized in that; the processing of described RTM module parity price route is further comprising the steps of: described RTM module judges that purpose IP address is identical with mask in the route entry that has existed in the purpose IP address and mask and its RIB table in this route entry; and when existence is not for the route entry that activates, whether is present in according to the down hop gateway address in the ARP table of operating system and does different disposal.
17. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 15; it is characterized in that; whether the processing of described RTM module parity price route is further comprising the steps of: described RTM module is judged in the route entry that has existed in the purpose IP address and mask and its RIB table in this route entry purpose IP address and mask not simultaneously, be present in according to the down hop gateway address in the ARP table of operating system to do different disposal.
18. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 15; it is characterized in that; the processing of described RTM module parity price route is further comprising the steps of: the down hop gateway address that described RTM module is judged current route is not in the ARP table time; the route entry state that writes is set to suspended state, and writes the RIB table.
19. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 15; it is characterized in that; the processing of described RTM module parity price route is further comprising the steps of: described RTM module judges that the down hop gateway address of current route is in the ARP table; and when the down hop gateway address that writes route is identical with the gateway of current active route; the route entry state that writes is set to suspended state, and writes the RIB table.
20. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 15; it is characterized in that; the processing of described RTM module parity price route is further comprising the steps of: described RTM module judges that the down hop gateway address that writes route is different from the gateway of current activation route; and when the current route that writes is more excellent; the route entry state that writes is set to state of activation is written to the RIB table, and the route entry state of current activation is set to stand-by state.
21. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 20; it is characterized in that; it is further comprising the steps of: after the route entry state of current activation is set to stand-by state; the original route that activates of deletion in the table of operating system is with the fib table of the current route write operation system that writes.
22. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 21; it is characterized in that; further comprising the steps of: behind the fib table with the current route write operation system that writes; the route of the former activation of deletion writes the current route that writes in the fib table of exchange chip in exchange chip.
23. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 15; it is characterized in that; further comprising the steps of: when active link opened circuit, the OSPF that is embodied as that the protection of high real-time speech business is switched relearned route, reaches the process that the RTM module is write the RIB table again.
24. the method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol as claimed in claim 23 is characterized in that, the realization that the protection of described high real-time speech business is switched may further comprise the steps:
If the link of path a opens circuit, the OSPF module perceives network topology variation has occured, and relearns immediately network topology, and own routing table of preserving is before all wiped, and the route that then will newly acquire writes the routing table of oneself, and announcement is to the RTM module;
The RTM module is all wiped RIB table before, again write the RIB table according to the route of new announcement, at this moment the route of path b then becomes the active route and is written into RIB-active table, and then writes the fib table of operating system and the fib table of exchange chip, realizes that three layer services stream transmits at path b.
25. such as each described method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol in the claim 15 to 24, it is characterized in that: the message that writes of described route entry comprises static routing and dynamic routing.
26. such as each described method that realizes the two first line of a couplet protections of OLT voice based on the OSPF Routing Protocol in the claim 15 to 24, it is characterized in that: described RTM module judges by comparing jumping figure whether the current route that writes is more excellent.
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