CN103166846A - Message forwarding method and device - Google Patents
Message forwarding method and device Download PDFInfo
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- CN103166846A CN103166846A CN2013101036862A CN201310103686A CN103166846A CN 103166846 A CN103166846 A CN 103166846A CN 2013101036862 A CN2013101036862 A CN 2013101036862A CN 201310103686 A CN201310103686 A CN 201310103686A CN 103166846 A CN103166846 A CN 103166846A
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Abstract
The invention discloses a message forwarding method and device. The method includes that a corresponding next hop route is inquired according to a destination internet protocol (IP) address of a message after the message is received by a route switching device; if the message is determined to be forwarded from a tunnel according to the next inquired hop route, tunnel encapsulation table entries which the tunnel corresponds to are inquired, wherein the tunnel encapsulation table entries at least comprise tunnel encapsulation information and outcoming interface information; and the route switching device performs tunnel encapsulation on the message according to the tunnel encapsulation information in the inquired tunnel encapsulation table entries and forwards encapsulated message according to the outcoming interface information in the tunnel encapsulation table entries. By means of the message forwarding method and device, the tunnel encapsulation efficiency can be improved, and the limitation of device encapsulation times is avoided.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of message forwarding method and equipment.
Background technology
Tunneling technique is a kind of encapsulation technology, and namely a kind of procotol is encapsulated in the data message of other procotol in the message of oneself, then transmits in network.The path that data message after encapsulation transmits in network is called the tunnel.The tunnel is a virtual point to point connect, and the two ends in tunnel need to encapsulate and decapsulation the data message.Tunneling technique just refers to comprise that data encapsulation, transmission reconciliation are encapsulated in interior overall process.But when existing many tunnels to forward in the application networking, aspect of performance also can Shortcomings, is mainly reflected in the following aspects:
(1) in the routing procedure in tunnel, need to check route when entering the tunnel one time, sealing up to install needs again to check route after finishing.If nested tunnel, routing procedure is more complicated so, affects routing performance.
(2) in the encapsulation process in nested tunnel, all to wait at every turn last layer seal up install into after, carry out the address route according to purpose IP in the IP encapsulation header and enter the tunnel and add encapsulation, have which floor tunnel is nested just need to add encapsulation several times, affect the tunnel and add the encapsulation performance.
(3) need repeatedly local loopback route during nested encapsulation, can be subject to the restriction of equipment packages number of times.
As shown in Figure 1, DUT1 need to communicate by letter with DUT7, and go-between exists the IPv4 network also to have the IPv6 network, and the upper existence of DUT2 three layers of nested tunnel, the message that DUT1 sends need three tunnel encapsulation finally send to DUT7.Fig. 2 shows and carries out the flow process that three layers of nested tunnel forward on DUT2, and Fig. 3 shows DUT2 and goes up the schematic diagram that nested tunnel adds encapsulation.Can find out, the nested forwarding process of three layer tunnel, experienced altogether 4 routes and added encapsulation 3 times: then at first original message will carry out the tunnel according to purpose IP address route and add encapsulation, the tunnel adds after encapsulation again according to the purpose IP address that adds after encapsulation and carries out route for the second time for the first time, then carry out the tunnel and add encapsulation, the like, original message has experienced altogether 4 routes 3 tunnels and has added encapsulation to going out DUT2 from entering DUT2.
Summary of the invention
The embodiment of the present invention provides a kind of message forwarding method and equipment, in order to the restriction that improves tunnel encapsulation efficient and avoid being subject to the equipment packages number of times.
The message forwarding method that the embodiment of the present invention provides comprises:
After route exchange device receives message, the down hop route corresponding according to the purpose IP address lookup of described message;
If determine to forward described message from the tunnel according to the down hop route that inquires, inquire about tunnel encapsulation list item corresponding to described tunnel; Wherein, comprise at least in the tunnel encapsulation list item: tunnel encapsulation information and outgoing interface information;
Described route exchange device carries out tunnel encapsulation according to the tunnel encapsulation information in the tunnel encapsulation list item that inquires to described message, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.
The route exchange device that the embodiment of the present invention provides comprises: routing inquiring module, tunnel encapsulation list item enquiry module, packet forwarding module;
Routing inquiring module, be used for after this equipment receives message, the down hop route corresponding according to the purpose IP address lookup of described message, if determine to forward described message from the tunnel according to the down hop route that inquires, indicate tunnel encapsulation list item corresponding to described tunnel encapsulation list item enquiry module inquiry;
Tunnel encapsulation list item enquiry module is used for inquiring about tunnel encapsulation list item corresponding to described tunnel; Wherein, comprise at least in the tunnel encapsulation list item: tunnel encapsulation information and outgoing interface information;
Packet forwarding module is used for according to the tunnel encapsulation information of the tunnel encapsulation list item that inquires, described message being carried out tunnel encapsulation, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.
In the above embodiment of the present invention, route exchange device is after receiving message, need to forward from the tunnel if determine, inquire about tunnel encapsulation list item corresponding to this tunnel, encapsulate this message according to the tunnel encapsulation list item that inquires, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.Owing to comprising rear tunnel encapsulation information and outgoing interface information in the tunnel encapsulation list item, therefore in repeating process, only need to look into a route enters the tunnel, enter to carry out behind the tunnel tunnel and add the encapsulation operation, and then forward according to the outgoing interface in the tunnel encapsulation list item, compared with prior art, reduced routing inquiry and tunnel encapsulation number of times, therefore improve the message tunnel packaging efficiency, and then improved message repeating efficient.In addition, due to routing inquiry of need and the operation that adds encapsulation, no longer be subjected to the restriction of equipment packages number of times.
Description of drawings
Fig. 1 is nested tunnel applications networking schematic diagram in prior art;
Fig. 2 is three layers of nested tunnel forwarding process schematic diagram in prior art;
Fig. 3 is that in prior art, nested tunnel adds the encapsulation process schematic diagram;
The Establishing process schematic diagram of the tunnel encapsulation list item that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 carries out to message the schematic flow sheet that tunnel encapsulation also forwards for what the embodiment of the present invention provided;
Fig. 6 is that the nested tunnel in the embodiment of the present invention adds the encapsulation schematic diagram;
The structural representation of the route exchange device that Fig. 7 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention affects the problem of forwarding performance for needing repeatedly route in nested tunnel repeating process in prior art, repeatedly adding encapsulation, and a kind of nested tunnel encapsulation scheme is provided, and in order to improving tunnel encapsulation efficient, and then improves forward efficiency.
In the embodiment of the present invention, state when the tunnel that configures on route exchange device is that Up(opens) after, generate the tunnel encapsulation list item, comprising IP packaging information of the tunnel encapsulation number of plies, every layer of encapsulation, and the outgoing interface information of down hop route corresponding to the destination address in a bottom IP packaging information.When this route exchange device receives message, and after determining to forward from the tunnel, the tunnel encapsulation list item corresponding according to this tunnel carries out tunnel encapsulation and forwarding to this message.Above-mentioned flow process is for nested tunnel encapsulation, only needing route (is that message is inquired about corresponding route table items when entering, and determine whether to forward from the tunnel) and encapsulation operation, and avoided causing greater than route exchange device inside Routing Loop round trip number because of nested encapsulation number of times the generation of retransmission failure situation.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
As shown in Figure 4, after the state in the tunnel that configures on route exchange device becomes Up, will trigger following tunnel encapsulation list item and set up process:
Step 401: the packaging information that this state is become the tunnel of Up is added in tunnel encapsulation list item corresponding to this tunnel, then changes step 402 over to.The tunnel encapsulation information of wherein, adding can comprise source IP address and the purpose IP address in this tunnel.
Concrete, can enable the encapsulation list item configuration feature in tunnel, like this, and after the state in this tunnel becomes Up, i.e. tunnel encapsulation list item corresponding to configurable this tunnel.Can enable tunnel encapsulation list item configuration feature by configuration flag bit on the tunnel face.
Step 402: search route according to the tunnel destination address in current tunnel encapsulation information of adding.
Step 403: if the outgoing interface of down hop route corresponding to this destination address is the tunnel face, show it is nested tunnel, change step 404 over to, otherwise change step 405 over to.
When specific implementation, for the situation that has equal-cost route, the embodiment of the present invention provides several routing modes for configured tunneling technique encapsulation list item process:
Mode one: the TOS field value in the configuration of IP head on the tunnel face in advance, different values represents different Routing Algorithms.Concrete, TOS field value span is 0-255, pre-defined this field value is 100 o'clock, corresponding routing policy is: if there is equal-cost route, preferentially selecting the tunnel face is outgoing interface, further, if there is tunnel face of equal value route, select IP address, tunnel face little for outgoing interface; If TOS is not equal to 100, according to the old process routing.
Mode two: the option field value in the configuration of IP head on the tunnel face in advance, different values represents different Routing Algorithms.Concrete, a bit with in Optional Field is used for identifying the routing mode, such as, with this bit position 0, routing is carried out in expression in a conventional manner; This bit is put 1, and expression is preferential, and to select the tunnel face be outgoing interface, further, if there is tunnel face of equal value route, select IP address, tunnel face little be outgoing interface.Preferably, under default situations, this field value is 0, can not affect like this processing of message miscellaneous service.
Above-mentioned dual mode is all by instruct when the configured tunneling technique encapsulation list item how routing at tunnel face configuration Routing Algorithm indication information.
Step 404: according to the configuration in this corresponding tunnel, tunnel face, the packaging information in this tunnel is added in tunnel encapsulation list item corresponding to current tunnel, then change step 402 over to.
Step 405: the outgoing interface of down hop route is added in tunnel encapsulation list item corresponding to this tunnel.
Add the process of tunnel encapsulation information by above iteration, for the nested tunnel of the tunnel face that becomes Up take this state as entrance, can set up corresponding tunnel encapsulation list item.At least comprise in tunnel encapsulation list item corresponding to the superiors tunnel in nested tunnel: the IP heading information of every layer of tunnel encapsulation in nested tunnel, and the outgoing interface information of down hop route corresponding to the destination address of iteration when adding the tunnel encapsulation end of message.Optionally, also can comprise the tunnel encapsulation number of plies (being the nested number of plies in tunnel).
Need to prove, for the individual layer tunnel, the also applicable embodiment of the present invention.For the individual layer tunnel, the tunnel encapsulation information in corresponding tunnel encapsulation list item is the packaging information in this tunnel, and outgoing interface information is the outgoing interface of down hop route corresponding to the destination address in this tunnel.
Preferably, can configure the maximum nested number of plies that allows on route exchange device, and after adding one deck tunnel encapsulation information in the tunnel encapsulation list item at every turn, the tunnel encapsulation number of plies in this tunnel encapsulation list item to be increased progressively all that (value of this tunnel encapsulation number of plies is since 1, every interpolation one deck tunnel encapsulation information adds 1 with this tunnel encapsulation number of plies).Before adding tunnel encapsulation information in the tunnel encapsulation list item at every turn, at first judge whether the tunnel encapsulation number of plies in current this tunnel encapsulation list item has reached the maximum nested number of plies that allows, if reach, abandon configuring this tunnel encapsulation list item, if also do not reach, continue according to aforementioned flow process configured tunneling technique encapsulation list item.
Further, consider that tunnel state or tunnel configuration may change because of a variety of causes, the embodiment of the present invention also provides the more new technological process of tunnel encapsulation list item for this reason, specifically can comprise following several situation:
(1) when route exchange device detects the state variation (source address or the destination address in tunnel change usually, and tunnel state can change) in the tunnel of configuration on it, trigger the operation of upgrading the tunnel encapsulation list item.Concrete, or/and destination address when changing, the state in former tunnel becomes DOWN from Up, triggers the operation of carrying out deletion or emptying corresponding tunnel encapsulation list item this moment when the source address in tunnel; When the tunnel that uses address after changing becomes Up from the DOWN state, create corresponding tunnel encapsulation list item according to aforementioned flow process.Further, if have other tunnel nested this state become the tunnel of DOWN, also to delete or empty tunnel encapsulation list item corresponding to this other tunnel, namely, when the state that tunnel of configuration detected on it when route exchange device becomes closed condition from open mode, deletion or empty the tunnel encapsulation list item corresponding to tunnel of this closed condition, and the corresponding tunnel encapsulation list item in tunnel in deletion or the tunnel that empties this closed condition nested.
(2) it is that down hop route outgoing interface changes that the route of destination address that tunnel of configuration detected on it when route exchange device changes, and triggers and upgrades corresponding tunnel encapsulation list item.Namely, when the outgoing interface of down hop route that the destination address in tunnel detected when route exchange device changes, outgoing interface after upgrading according to this tunnel upgrades tunnel encapsulation list item corresponding to this tunnel, and has upgraded the corresponding tunnel encapsulation list item in tunnel in this tunnel nested.Concrete, when the down hop route outgoing interface that the destination address in individual layer tunnel detected when route exchange device changes, replace the outgoing interface in the corresponding tunnel encapsulation list item in tunnel in this individual layer tunnel and all nested this individual layers tunnels with the outgoing interface after changing.The route that the destination address in tunnel detected when route exchange device is that down hop route outgoing interface changes and this tunnel is nested with other tunnel, upgrade according to the down hop route outgoing interface after upgrading tunnel encapsulation list item corresponding to tunnel that this down hop route changes, and upgrade the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel (being the tunnel that the down hop route changes), the operation of upgrading the tunnel encapsulation list item can be with reference to the process of aforesaid establishment tunnel encapsulation list item.
Based on the tunnel encapsulation list item, receive the message of subscriber equipment transmission when route exchange device after, this message is carried out tunnel encapsulation and forwarding, its message tunnel encapsulation and forwarding process can as shown in Figure 5, comprise:
Step 501: the route table items corresponding according to the purpose IP address lookup of this message.
Step 502: if in the route table items that inquires, the outgoing interface of down hop route corresponding to this purpose IP address is the tunnel face, changes step 503 over to, otherwise change step 505 over to.
Step 503: the tunnel indicated according to the outgoing interface of this down hop route, inquire about tunnel encapsulation list item corresponding to this tunnel.
Step 504: according to the tunnel encapsulation information in the tunnel encapsulation list item that inquires, this message is carried out tunnel encapsulation, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.
Further, when message is carried out tunnel encapsulation, the tunnel encapsulation number of plies in the tunnel encapsulation list item can be added in outer IP head.Like this, when transmitting in network with the message of tunnel encapsulation, route exchange device is used for identifying the field of the tunnel encapsulation number of plies in can the outer IP head according to this message, judges which floor tunnel encapsulation this message has passed through.Partial bit in can pre-defined IP head in Optional Field is used for the tunnel encapsulation number of plies of mark message.Preferably, can stipulate that the nested number of plies maximum in the tunnel that allows is 7, in such cases, can come the mark tunnel encapsulation number of plies with 2 bits.
Step 505: this message is carried out forward process according to conventional three layers of forwarding process.
In a kind of specific implementation of using flow process shown in Figure 5, in the step 502 of above-mentioned flow process, when being this message routing according to route table items, can select corresponding Routing Algorithm according to the value of the TOS field in message IP head.Concrete, the span of TOS field is 0-255, if TOS=100 in the IP head, when being the message routing, if there is equal-cost route, preferentially selecting the tunnel face is outgoing interface, further, if there is tunnel face of equal value route, select IP address, tunnel face little for outgoing interface; If in the IP head, TOS is not equal to 100, when being the message routing, process according to old process.Accordingly, in step 504, under default situations, when message is added tunnel encapsulation, synchronously copy TOS field contents in internal layer IP head, the message that assurance adds after tunnel encapsulation is processed consistent with original message.
Further, if the routing result is to forward from the tunnel, and dispose Routing Algorithm indication information (being TOS field value here) on this tunnel face, in step 504, when this message is carried out tunnel encapsulation, the Routing Algorithm indication information that configures on this tunnel face is added to the TOS field of tunnel encapsulation head, be used for instructing the routing of the follow-up repeating process of this message.
In the another kind of specific implementation of using flow process shown in Figure 5, in the step 502 of above-mentioned flow process, when being this message routing according to route table items, can select corresponding Routing Algorithm according to the option value in message IP head.Concrete, a bit in the option field in definable IP head is used for identifying the routing mode, such as, with this bit position 0, routing is carried out in expression in a conventional manner; This bit is put 1, and expression is preferential, and to select the tunnel face be outgoing interface, further, if there is tunnel face of equal value route, select IP address, tunnel face little be outgoing interface.Preferably, under default situations, this field value is 0, can not affect like this processing of message miscellaneous service.Accordingly, in step 504, under default situations, when message is added tunnel encapsulation, synchronously copy this field contents in internal layer IP head, the message that assurance adds after tunnel encapsulation is processed consistent with original message.
Further, if the routing result is to forward from the tunnel, and dispose Routing Algorithm indication information (being the option value here) on this tunnel face, in step 504, when this message is carried out tunnel encapsulation, the Routing Algorithm indication information that configures on this tunnel face is added to the option field of tunnel encapsulation head, be used for instructing the routing of the follow-up repeating process of this message.
For the clearer explanation embodiment of the present invention, the below describes the specific implementation process of the embodiment of the present invention in detail take networking shown in Figure 1 as example.
As shown in Figure 1, set up 4in4 tunnel T1 between DUT2 and DUT4; Set up 6in4 tunnel T2 between DUT2 and DUT5, the source in T2 tunnel is T1; Set up 6in6 tunnel T3 between DUT2 and DUT6, the source in T3 tunnel is T2.That is, there are individual layer tunnel T1, two-layer nested tunnel T2 and three layers of nested tunnel T3 in current networking.DUT1 and DUT7 are IPv6 protocol stack route exchange device.
After T1 tunnel state Up, DUT2 is according to the destination address query routing in T1 tunnel, obtain outgoing interface corresponding to destination address route next jump, this outgoing interface is not the tunnel face, according to source address, destination address, the encapsulation number of plies and the outgoing interface corresponding to tunnel destination address in T1 tunnel, generate tunnel encapsulation list item corresponding to T1 tunnel.Encapsulation number of times numerical value in this list item is 1, and outgoing interface is the corresponding outgoing interface of destination address route next jump in T1 tunnel, and the tunnel encapsulation content comprises: the source IP address in T1 tunnel, purpose IP address.
After T2 tunnel state Up, DUT2 is according to the destination address query routing in T2 tunnel, obtain the T1 tunnel face that outgoing interface corresponding to destination address is bottom, be judged as nested tunnel, first add the packaging information in T2 tunnel to tunnel encapsulation list item corresponding to this tunnel, successively add the packaging information in bottom tunnel according to the configuration in this bottom tunnel (being the T1 tunnel) here again, then add bottom tunnel destination address route outgoing interface, generate tunnel encapsulation list item corresponding to T2 tunnel.Encapsulation number of times numerical value in this list item is 2, and outgoing interface is the corresponding outgoing interface of destination address route next jump in T1 tunnel, and the tunnel encapsulation content comprises: the source IP address in T1 tunnel, purpose IP address, and the source IP address in T2 tunnel and purpose IP address.
After T3 tunnel state Up, DUT2 is according to the destination address query routing in T3 tunnel, obtain the T2 tunnel face that outgoing interface corresponding to destination address is bottom, be judged as nested tunnel, first add the packaging information in T3 tunnel to tunnel encapsulation list item corresponding to this tunnel, add successively again the packaging information in T2 tunnel and T1 tunnel here according to the configuration in bottom tunnel (being the T2 tunnel), then add T1 tunnel destination address route outgoing interface, generate tunnel encapsulation list item corresponding to T3 tunnel.Encapsulation number of times numerical value in this list item is 3, outgoing interface is the corresponding outgoing interface of destination address route next jump in T1 tunnel, the tunnel encapsulation content comprises: the source IP address in T1 tunnel, purpose IP address, the source IP address in T2 tunnel, purpose IP address, and the source IP address in T3 tunnel, purpose IP address.
DUT1 need to be by T3 tunnel access DUT7.in such cases, (source of this message is 1::1 when DUT2 receives the IPv6 message from DUT1, purpose is 6::2) after, search corresponding route table items according to the destination address of this message, definite needs pass through T3 tunnel forwarding with this message, therefore inquire about tunnel encapsulation list item corresponding to T3 tunnel, this list item comprises T1, T2, the tunnel encapsulation information of T3, the outgoing interface that also comprises tunnel purpose route when iteration finishes, as shown in Figure 6, DUT2 carries out tunnel encapsulation according to the tunnel encapsulation list item that inquires to this message and (comprises successively T1 from the bottom to the high level, T2, the packaging information in T3 tunnel), then according to the message after the forwarding of the outgoing interface in this list item encapsulation.
This message carries out the process of decapsulation at the tunnel other end in the process of network repeating, identical with existing implementation, does not repeat them here.
Can find out, in whole repeating process, after receiving original message, only need to look into a route and enter the tunnel, advance to carry out a tunnel behind the tunnel and add the encapsulation operation, and then forward according to the outgoing interface in the tunnel encapsulation list item, compared with prior art, reduced routing inquiry and tunnel encapsulation number of times, therefore improved the message tunnel packaging efficiency, and then improved message repeating efficient.In addition, due to routing inquiry of need and the operation that adds encapsulation, no longer be subjected to the restriction of equipment packages number of times.
In addition, the embodiment of the present invention also provides the renewal handling process of tunnel encapsulation list item.Still take networking shown in Figure 1 and tunnel configuration as example, illustrate as follows:
If T1 tunnel DOWN, tunnel encapsulation list item corresponding to DUT2 deletion T1 tunnel; Be the bottom tunnel in T2 tunnel and T3 tunnel due to the T1 tunnel, so DUT2 also delete tunnel encapsulation list item corresponding to tunnel encapsulation list item and T3 tunnel corresponding to T2 tunnel;
If T2 tunnel DOWN, tunnel encapsulation list item corresponding to DUT2 deletion T2 tunnel, because the T2 tunnel is the bottom tunnel in T3 tunnel, so DUT2 also deletes tunnel encapsulation list item corresponding to T3 tunnel;
If T3 tunnel DOWN, tunnel encapsulation list item corresponding to DUT2 deletion T3 tunnel;
If the down hop route outgoing interface of the purpose IP address in T1 tunnel changes, DUT2 upgrades the down hop route outgoing interface in tunnel encapsulation list item corresponding to T1 tunnel; Be the bottom tunnel in T2 tunnel and T3 tunnel due to the T1 tunnel, so DUT2 also upgrade the down hop route outgoing interface in tunnel encapsulation list item corresponding to T2 tunnel and T3 tunnel;
If the down hop route outgoing interface of the purpose IP address in T2 tunnel changes, down hop route outgoing interface after DUT2 upgrades according to the T2 tunnel upgrades tunnel encapsulation list item corresponding to T2 tunnel, because the T3 tunnel is embedded with the T2 tunnel, so DUT2 also upgrades tunnel encapsulation list item corresponding to T3 tunnel.such as, the down hop route outgoing interface of the purpose IP address in T2 tunnel is updated to the tunnel face (T4 tunnel be the individual layer tunnel) in T4 tunnel, DUT2 with the tunnel encapsulation information updating in the tunnel encapsulation list item in T2 tunnel is: the packaging information that is followed successively by the T4 tunnel from the bottom to the high level, the packaging information in T2 tunnel, outgoing interface is the down hop route outgoing interface of the destination address in T4 tunnel, with the tunnel encapsulation information updating in the tunnel encapsulation list item in T3 tunnel be: the packaging information that is followed successively by the T4 tunnel from the bottom to the high level, the packaging information in T2 tunnel, the packaging information in T3 tunnel, outgoing interface is the down hop route outgoing interface of the destination address in T4 tunnel.
Based on identical technical conceive, the invention process also provides a kind of route exchange device.
Referring to Fig. 7, the structural representation of the route exchange device that provides for the embodiment of the present invention.As shown in the figure, this route exchange device can comprise: routing inquiring module 71, tunnel encapsulation list item enquiry module 72, packet forwarding module 73, further, also comprise tunnel encapsulation list item processing module 74, wherein:
Routing inquiring module 71, be used for after this equipment receives message, the down hop route corresponding according to the purpose IP address lookup of described message, if determine to forward described message from the tunnel according to the down hop route that inquires, indicate tunnel encapsulation list item enquiry module 72 tunnel encapsulation list items corresponding to inquiry;
Tunnel encapsulation list item enquiry module 72 is used for inquiring about tunnel encapsulation list item corresponding to described tunnel; Wherein, comprise at least in the tunnel encapsulation list item: tunnel encapsulation information and outgoing interface information;
Packet forwarding module 73 is used for according to the tunnel encapsulation information of the tunnel encapsulation list item that inquires, described message being carried out tunnel encapsulation, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.
Concrete, if the outgoing interface of the down hop route that routing inquiring module 71 inquires is the tunnel face, determine that the tunnel corresponding from described tunnel face forwards described message.
Concrete, if there is not equal-cost route in the down hop route that routing inquiring module 71 inquires, and outgoing interface is the tunnel face, determines that the tunnel corresponding from described tunnel face forwards described message; Perhaps, if there is equal-cost route in the down hop route that inquires, and outgoing interface comprises the tunnel face, judge and whether carry the Routing Algorithm indication information in described message, if carry, determine that the tunnel corresponding from described tunnel face forwards described message, the Routing Algorithm indication information that carries in wherein said message, be used to indicate in the situation that has equal-cost route, preferentially selecting the tunnel face is outgoing interface.
Further, packet forwarding module 73 also is used for: if routing inquiring module 71 determines to forward from the tunnel described message according to the down hop route that inquires, and dispose the Routing Algorithm indication information on the tunnel face in described tunnel, the Routing Algorithm indication information that configures on the tunnel face is added in the tunnel encapsulation of described message; Wherein, the Routing Algorithm indication information that configures on described tunnel face is used to indicate in the situation that has equal-cost route, and preferentially selecting the tunnel face is outgoing interface.
Further, also comprise encapsulation number of plies information in the tunnel encapsulation list item.Packet forwarding module 73 when according to the tunnel encapsulation information in the tunnel encapsulation list item that inquires, described message being carried out tunnel encapsulation, also with the encapsulation number of plies Information encapsulation in this tunnel encapsulation list item in described message.
Concrete, tunnel encapsulation list item processing module 74 can be set up the tunnel encapsulation list item according to following steps:
Steps A: when the state in tunnel of configuration becomes open mode on detecting it, the packaging information in the tunnel of this open mode is added in tunnel encapsulation list item corresponding to this tunnel;
Step B: the down hop route corresponding according to the purpose IP address lookup in the tunnel encapsulation information of current interpolation if determine that according to the down hop route that inquires corresponding outgoing interface is the tunnel face, changes step C over to, otherwise changes step D over to;
Step C: the packaging information in the tunnel that the tunnel face that inquires is corresponding is added in tunnel encapsulation list item corresponding to the tunnel of this open mode, then changes step B over to;
Step D: the outgoing interface of down hop route is added in tunnel encapsulation list item corresponding to the tunnel of this open mode;
The tunnel encapsulation information of wherein, adding comprises source IP address and the purpose IP address in tunnel.
Concrete, tunnel encapsulation list item processing module 74 specifically is used for: if there is not equal-cost route in the down hop route that inquires, and outgoing interface is the tunnel face, determines that outgoing interface corresponding to down hop route is the tunnel face; Perhaps, if there is equal-cost route in the down hop route that inquires, and dispose the Routing Algorithm indication information on the tunnel face in the tunnel of current interpolation tunnel encapsulation information, in the situation that there is the tunnel face in equal-cost route, select the tunnel face as the outgoing interface in the tunnel of current interpolation tunnel encapsulation information according to described Routing Algorithm indication information, wherein, the Routing Algorithm indication information that configures on described tunnel face, be used to indicate in the situation that has equal-cost route, preferentially selecting the tunnel face is outgoing interface.
Further, also comprise encapsulation number of plies information in the tunnel encapsulation list item.Accordingly, tunnel encapsulation list item processing module 74 in adding tunnel encapsulation information to the tunnel encapsulation list item before, judge whether the encapsulation number of plies in this tunnel encapsulation list item has reached the maximum encapsulation number of plies that allows, if judge that the encapsulation number of plies in this tunnel encapsulation list item has reached the maximum encapsulation number of plies that allows, and abandons setting up this tunnel encapsulation list item; After adding tunnel encapsulation information to the tunnel encapsulation list item, upgrade the encapsulation number of plies information in this tunnel encapsulation list item.
Further, tunnel encapsulation list item processing module 74 also is used for: become closed condition if the state in the tunnel of configuration on it detected from open mode, delete the tunnel encapsulation list item corresponding to tunnel of this closed condition, and deletion is nested with the corresponding tunnel encapsulation list item in tunnel in this closed condition tunnel; If the outgoing interface of down hop route of the destination address in tunnel being detected changes, and determine that this tunnel is the individual layer tunnel, outgoing interface after upgrading according to this tunnel upgrades tunnel encapsulation list item corresponding to this tunnel, and upgrades the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel; If the outgoing interface of down hop route of the destination address in tunnel being detected changes, and determine that this tunnel is nested with other tunnel, upgrade tunnel encapsulation list item corresponding to this tunnel according to the down hop route outgoing interface after upgrading, and upgrade the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel.
In sum, the embodiment of the present invention can realize following technique effect:
(1) compared with prior art, save the routing procedure after the tunnel adds encapsulation, directly determine route next jump according to the outgoing interface of tunnel destination address, improve routing performance.
(2) compared with prior art, nested tunnel repeatedly adds encapsulation process to be saved 1 time, improves the tunnel and adds the encapsulation performance, thereby improve forwarding performance.
(3) encapsulation in the applicable equally individual layer of embodiment of the present invention tunnel compared with prior art, can be omitted a routing procedure that adds after encapsulation.
(4) can not be subject to again the restriction of device interior Routing Loop round trip number.
(5) embodiment of the present invention does not affect the normal operation of existing tunnel forwarding capability.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
Claims (16)
1. a message forwarding method, is characterized in that, comprising:
After route exchange device receives message, the down hop route corresponding according to the purpose IP address lookup of described message;
If determine to forward described message from the tunnel according to the down hop route that inquires, inquire about tunnel encapsulation list item corresponding to described tunnel; Wherein, comprise at least in the tunnel encapsulation list item: tunnel encapsulation information and outgoing interface information;
Described route exchange device carries out tunnel encapsulation according to the tunnel encapsulation information in the tunnel encapsulation list item that inquires to described message, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.
2. the method for claim 1, is characterized in that, the down hop route that described basis inquires is determined to forward described message from the tunnel, specifically comprises:
If there is not equal-cost route in the down hop route that inquires, and outgoing interface is the tunnel face, determines that the tunnel corresponding from described tunnel face forwards described message;
Perhaps, if there is equal-cost route in the down hop route that inquires, and outgoing interface comprises the tunnel face, judge and whether carry the Routing Algorithm indication information in described message, if carry, determine that the tunnel corresponding from described tunnel face forwards described message, the Routing Algorithm indication information that carries in wherein said message, be used to indicate in the situation that has equal-cost route, preferentially selecting the tunnel face is outgoing interface.
3. method as claimed in claim 2, is characterized in that, described method also comprises:
If determine to forward described message from the tunnel according to the down hop route that inquires, and dispose the Routing Algorithm indication information on the tunnel face in described tunnel, the Routing Algorithm indication information that configures on the tunnel face is added in the tunnel encapsulation of described message; Wherein, the Routing Algorithm indication information that configures on described tunnel face is used to indicate in the situation that has equal-cost route, and preferentially selecting the tunnel face is outgoing interface.
4. the method for claim 1, is characterized in that, also comprises encapsulation number of plies information in the tunnel encapsulation list item;
When described route exchange device carries out tunnel encapsulation according to the tunnel encapsulation information in the tunnel encapsulation list item that inquires to described message, the encapsulation number of plies Information encapsulation in this tunnel encapsulation list item is arrived described message.
5. the method for claim 1, is characterized in that, the process of setting up of tunnel encapsulation list item comprises:
Steps A: when the state that tunnel of configuration detected on it when described route exchange device becomes open mode, the packaging information in the tunnel of this open mode is added in tunnel encapsulation list item corresponding to this tunnel;
Step B: the down hop route that described route exchange device is corresponding according to the purpose IP address lookup in the tunnel encapsulation information of current interpolation, if determine that according to the down hop route that inquires corresponding outgoing interface is the tunnel face, change step C over to, otherwise change step D over to;
Step C: the packaging information in the tunnel that described route exchange device is corresponding with the tunnel face that inquires is added in tunnel encapsulation list item corresponding to the tunnel of this open mode, then changes step B over to;
Step D: described route exchange device adds the outgoing interface of down hop route in tunnel encapsulation list item corresponding to the tunnel of this open mode to;
The tunnel encapsulation information of wherein, adding comprises source IP address and the purpose IP address in tunnel.
6. method as claimed in claim 5, is characterized in that, in described step B, determines according to the down hop route that inquires whether corresponding outgoing interface is the tunnel face, specifically comprises:
If there is not equal-cost route in the down hop route that inquires, and outgoing interface is the tunnel face, determines that outgoing interface corresponding to down hop route is the tunnel face;
Perhaps, if there is equal-cost route in the down hop route that inquires, and dispose the Routing Algorithm indication information on the tunnel face in the tunnel of current interpolation tunnel encapsulation information, in the situation that there is the tunnel face in equal-cost route, select the tunnel face as the outgoing interface in the tunnel of current interpolation tunnel encapsulation information according to described Routing Algorithm indication information, wherein, the Routing Algorithm indication information that configures on described tunnel face, be used to indicate in the situation that has equal-cost route, preferentially selecting the tunnel face is outgoing interface.
7. method as claimed in claim 5, is characterized in that, also comprises encapsulation number of plies information in the tunnel encapsulation list item; Described method also comprises:
Before in adding tunnel encapsulation information to the tunnel encapsulation list item, judge whether the encapsulation number of plies in this tunnel encapsulation list item has reached the maximum encapsulation number of plies that allows, if judge that the encapsulation number of plies in this tunnel encapsulation list item has reached the maximum encapsulation number of plies that allows, and abandons setting up this tunnel encapsulation list item;
After adding tunnel encapsulation information to the tunnel encapsulation list item, upgrade the encapsulation number of plies information in this tunnel encapsulation list item.
8. the method for claim 1, is characterized in that, described method also comprises:
If detecting the state in the tunnel of configuration on it, described route exchange device becomes closed condition from open mode, delete the tunnel encapsulation list item corresponding to tunnel of this closed condition, and deletion is nested with the corresponding tunnel encapsulation list item in tunnel in this closed condition tunnel;
If detecting the outgoing interface of down hop route of the destination address in tunnel, described route exchange device changes, and determine that this tunnel is the individual layer tunnel, outgoing interface after upgrading according to this tunnel upgrades tunnel encapsulation list item corresponding to this tunnel, and upgrades the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel;
If detecting the outgoing interface of down hop route of the destination address in tunnel, described route exchange device changes, and determine that this tunnel is nested with other tunnel, upgrade tunnel encapsulation list item corresponding to this tunnel according to the down hop route outgoing interface after upgrading, and upgrade the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel.
9. a route exchange device, is characterized in that, comprising: routing inquiring module, tunnel encapsulation list item enquiry module, packet forwarding module;
Routing inquiring module, be used for after this equipment receives message, the down hop route corresponding according to the purpose IP address lookup of described message, if determine to forward described message from the tunnel according to the down hop route that inquires, indicate tunnel encapsulation list item corresponding to described tunnel encapsulation list item enquiry module inquiry;
Tunnel encapsulation list item enquiry module is used for inquiring about tunnel encapsulation list item corresponding to described tunnel; Wherein, comprise at least in the tunnel encapsulation list item: tunnel encapsulation information and outgoing interface information;
Packet forwarding module is used for according to the tunnel encapsulation information of the tunnel encapsulation list item that inquires, described message being carried out tunnel encapsulation, and according to the message after the forwarding of the outgoing interface in this tunnel encapsulation list item encapsulation.
10. route exchange device as claimed in claim 9, it is characterized in that, described routing inquiring module specifically is used for, if there is not equal-cost route in the down hop route that inquires, and outgoing interface is the tunnel face, determines that the tunnel corresponding from described tunnel face forwards described message;
Perhaps, if there is equal-cost route in the down hop route that inquires, and outgoing interface comprises the tunnel face, judge and whether carry the Routing Algorithm indication information in described message, if carry, determine that the tunnel corresponding from described tunnel face forwards described message, the Routing Algorithm indication information that carries in wherein said message, be used to indicate in the situation that has equal-cost route, preferentially selecting the tunnel face is outgoing interface.
11. route exchange device as claimed in claim 10, it is characterized in that, described packet forwarding module also is used for, if described routing inquiring module determines to forward from the tunnel described message according to the down hop route that inquires, and dispose the Routing Algorithm indication information on the tunnel face in described tunnel, the Routing Algorithm indication information that configures on the tunnel face is added in the tunnel encapsulation of described message; Wherein, the Routing Algorithm indication information that configures on described tunnel face is used to indicate in the situation that has equal-cost route, and preferentially selecting the tunnel face is outgoing interface.
12. route exchange device as claimed in claim 9 is characterized in that, also comprises encapsulation number of plies information in the tunnel encapsulation list item;
Described packet forwarding module also is used for, and when according to the tunnel encapsulation information in the tunnel encapsulation list item that inquires, described message being carried out tunnel encapsulation, the encapsulation number of plies Information encapsulation in this tunnel encapsulation list item is arrived described message.
13. route exchange device as claimed in claim 9 is characterized in that, also comprises:
Tunnel encapsulation list item processing module is used for setting up the tunnel encapsulation list item according to following steps:
Steps A: when the state in tunnel of configuration becomes open mode on detecting it, the packaging information in the tunnel of this open mode is added in tunnel encapsulation list item corresponding to this tunnel;
Step B: the down hop route corresponding according to the purpose IP address lookup in the tunnel encapsulation information of current interpolation if determine that according to the down hop route that inquires corresponding outgoing interface is the tunnel face, changes step C over to, otherwise changes step D over to;
Step C: the packaging information in the tunnel that the tunnel face that inquires is corresponding is added in tunnel encapsulation list item corresponding to the tunnel of this open mode, then changes step B over to;
Step D: the outgoing interface of down hop route is added in tunnel encapsulation list item corresponding to the tunnel of this open mode;
The tunnel encapsulation information of wherein, adding comprises source IP address and the purpose IP address in tunnel.
14. route exchange device as claimed in claim 13, it is characterized in that, described tunnel encapsulation list item processing module specifically is used for, if there is not equal-cost route in the down hop route that inquires, and outgoing interface is the tunnel face, determines that outgoing interface corresponding to down hop route is the tunnel face; Perhaps, if there is equal-cost route in the down hop route that inquires, and dispose the Routing Algorithm indication information on the tunnel face in the tunnel of current interpolation tunnel encapsulation information, in the situation that there is the tunnel face in equal-cost route, select the tunnel face as the outgoing interface in the tunnel of current interpolation tunnel encapsulation information according to described Routing Algorithm indication information, wherein, the Routing Algorithm indication information that configures on described tunnel face, be used to indicate in the situation that has equal-cost route, preferentially selecting the tunnel face is outgoing interface.
15. route exchange device as claimed in claim 13 is characterized in that, also comprises encapsulation number of plies information in the tunnel encapsulation list item;
Described tunnel encapsulation list item processing module also is used for, before in adding tunnel encapsulation information to the tunnel encapsulation list item, judge whether the encapsulation number of plies in this tunnel encapsulation list item has reached the maximum encapsulation number of plies that allows, if judge that the encapsulation number of plies in this tunnel encapsulation list item has reached the maximum encapsulation number of plies that allows, and abandons setting up this tunnel encapsulation list item; After adding tunnel encapsulation information to the tunnel encapsulation list item, upgrade the encapsulation number of plies information in this tunnel encapsulation list item.
16. route exchange device as claimed in claim 9 is characterized in that, described tunnel encapsulation list item processing module also is used for:
Become closed condition if state in the tunnel of configuration detected on it from open mode, delete the tunnel encapsulation list item corresponding to tunnel of this closed condition, and deletion is nested with the corresponding tunnel encapsulation list item in tunnel in this closed condition tunnel;
If the outgoing interface of down hop route of the destination address in tunnel being detected changes, and determine that this tunnel is the individual layer tunnel, outgoing interface after upgrading according to this tunnel upgrades tunnel encapsulation list item corresponding to this tunnel, and upgrades the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel;
If the outgoing interface of down hop route of the destination address in tunnel being detected changes, and determine that this tunnel is nested with other tunnel, upgrade tunnel encapsulation list item corresponding to this tunnel according to the down hop route outgoing interface after upgrading, and upgrade the corresponding tunnel encapsulation list item in tunnel that is nested with this tunnel.
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