CN104767680A - Rapid route switch method and device - Google Patents
Rapid route switch method and device Download PDFInfo
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- CN104767680A CN104767680A CN201510176204.5A CN201510176204A CN104767680A CN 104767680 A CN104767680 A CN 104767680A CN 201510176204 A CN201510176204 A CN 201510176204A CN 104767680 A CN104767680 A CN 104767680A
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Abstract
The invention provides a rapid route switch method and device. A BFD conversation monitors a link. When the BFD conversation monitors that the link from first equipment to second equipment has a fault, the second equipment directly selects a standby route of a main route from a local FIB forwarding table to serve as a new main route which replaces an original main route to carry out traffic forwarding, the route can be switched to be millisecond level, and rapid switching of routes is realized.
Description
Technical field
The application relates to the network communications technology, particularly the method and apparatus that switches fast of route.
Background technology
IP in wireless access network IPization (IPRAN) refers to interconnection protocol, and RAN refers to Radio Access Network (Radio Access Network).Relative to traditional SDH (Synchronous Digital Hierarchy) (SDH:Synchronous Digital Hierarchy) transport network, IPRAN is the mobile retransmission network based on IP technology.
Fig. 1 shows IPRAN networking structure, and in the IPRAN networking shown in Fig. 1, device A is access layer equipment, receives wireless messages; Equipment B 1, equipment B 2 are convergence-level equipment, equipment B 1, equipment B 2 use two-layer virtual local area network (LAN) (L2VPN) access L 3 virtual local area network (LAN) (L3VPN) technology; ER1, ER2 are equipment of the core network, and CE is customer edge.In FIG, device A respectively and equipment B 1, establish L2VPN active/standby pseudo wires (PW) between equipment B 2, equipment B 1 and ER1, equipment B 2 and ER2 establish Border Gateway Protocol (BGP:Border Gateway Protocol) VPNv4 neighbours, ER1, ER2 and CE set up BGP many examples neighbours respectively, set up bgp neighbor between equipment B 1 and equipment B 2.
In FIG, when equipment B 2 learns the main frame of device A connection (when being designated as main frame ARP route a), the ARP route learnt is distributed to bgp neighbor and equipment B 1 according to the mode issuing BGP route by equipment B 2, here, the ARP route essence that equipment B 2 is issued according to the mode issuing BGP route is just equivalent to a BGP route, therefore BGP route is called, the BGP route record that equipment B 1 receiving equipment B2 issues is to bgp routing table, the main frame that equipment B 1 also can learn device A connection (is designated as main frame ARP a) and routes to bgp routing table, this study to ARP route and the BGP route issued of equipment B 2 be that agreement is different, the former is ARP agreement, the latter is the equal of bgp protocol, but there is identical prefix, based on this, the priority of the ARP route that equipment B 1 meeting comparative learning arrives and the BGP route that equipment B 2 is issued, in bgp routing table, BGP route is well below the route of other agreements, therefore, equipment B 1 can think that the ARP route learning to arrive is optimum, by study to ARP route (down hop of this route is device A) under brush to FIB routing table coaching device B1 and carry out message repeating.
When link in the networking of IPRAN shown in Fig. 1 is normal, the Business Stream being sent to main frame a entered from CE first arrives equipment B 1 through following path CE->ER1-> equipment B 1, when equipment B 1 receives Business Stream, based on the ARP route in above-mentioned FIB routing table, Business Stream is sent to device A, is finally sent to main frame a, but during link failure between device A and equipment B 1, then when equipment B 1 receives Business Stream, because the link failure between device A and equipment B 1, if or send Business Stream according to the ARP route in above-mentioned FIB routing table, then failure can be sent, but now there are not other routes in FIB routing table, based on this, equipment B 1 must return to the BGP route that other routes of finding from bgp routing table and having same prefix with ARP route and the said equipment B2 issue, brush to FIB routing table by under the BGP route found, according to the BGP route in FIB routing table, Business Stream is sent to equipment B 2 again, finally be sent to main frame a, and the BGP route of same prefix is searched from bgp routing table, consuming time long by brushing to FIB routing table under the BGP route of same prefix, reach level second, this route with regard to limit service stream institute warp can not switch fast, increases Business Stream break period.
Summary of the invention
This application provides the method and apparatus that route switches fast, to realize the quick switching of route, reduce Business Stream break period.
The technical scheme that the application provides comprises:
A kind of route fast switch over method, the method is applied to following networking: establish main pseudo-line PW between the first equipment and the second equipment, establish standby PW between the first equipment and the 3rd equipment, second equipment and the 3rd equipment establish Border Gateway Protocol (BGP) neighbours, the method is applied to described second equipment, comprising:
By brush under there is in local bgp routing table the preferred route of same prefix and not preferred route to local IP route table; From having the route of same prefix in local IP route table select route that priority is the highest as main road by, and select from other remaining routes described main road by alternate routing;
Transmitted to local FIB by with brush under alternate routing by described main road, described main road is by being used to guide traffic forwarding, and described alternate routing is in stand-by state;
For local FIB transmits middle main establishing route for monitoring the BFD session of main road by the link of correspondence, described link comprises the link from described first equipment to this second equipment;
When BFD session monitors the link failure from described first equipment to this second equipment, from local FIB transmit delete described main road by, select described main road by an alternate routing as new main road by replace former main road by carrying out traffic forwarding.
A kind of route apparatus for fast switching, this application of installation is in the second equipment of following networking: establish main pseudo-line PW between the first equipment and the second equipment, establish standby PW between the first equipment and the 3rd equipment, second equipment and the 3rd equipment establish Border Gateway Protocol (BGP) neighbours, and this device comprises:
Bgp routing table administrative unit, for by brush under there is in local bgp routing table the preferred route of same prefix and not preferred route to local IP route table;
IP route table administrative unit, for select from having in the route of same prefix in local IP route table route that priority is the highest as main road by, and select from other remaining routes described main road by alternate routing; Transmitted to local FIB by with brush under alternate routing by described main road, described main road is by being used to guide traffic forwarding, and described alternate routing is in stand-by state;
FIB routing table administrative unit, for transmitting middle main establishing route for local FIB for monitoring the BFD session of main road by the link of correspondence, described link comprises the link from described first equipment to this second equipment;
Route handoff unit, during for monitoring when BFD session from described first equipment to the link failure of this second equipment, from local FIB transmit delete described main road by, select described main road by an alternate routing as new main road by replace former main road by carrying out traffic forwarding.
As can be seen from the above technical solutions, in the present invention, the link from first equipment to the second equipment of main road by correspondence is monitored by BFD session, and BFD session monitoring can reach the monitoring velocity of Millisecond, when monitoring out the link failure from the first equipment to the second equipment, second equipment directly from local FIB transmit the described main road of middle selection by an alternate routing as new main road by carrying out traffic forwarding, not as the BGP route of searching same prefix from bgp routing table that background technology describes, brush to FIB routing table by under the BGP route of same prefix, this compares the route handoff that background technology describes, route handoff can be made to arrive Millisecond, realize the quick switching of route.
Accompanying drawing explanation
Fig. 1 is IPRAN networking structure figure;
Fig. 2 is method flow diagram provided by the invention;
The dual-homing networking schematic diagram that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is structure drawing of device provided by the invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.
Method provided by the invention comprises the flow process shown in Fig. 2:
Be method flow diagram provided by the invention see Fig. 2, Fig. 2.This flow process can be applicable to following networking: establish main PW between the first equipment and the second equipment, and establish standby PW between the first equipment and the 3rd equipment, the second equipment and the 3rd equipment establish bgp neighbor.
Correspond to IPRAN as shown in Figure 1, the first equipment is here just the device A in Fig. 1, and the second equipment is just that equipment B the 1, three equipment in Fig. 1 is just the equipment B 2 in Fig. 1.
And the CE dual-homing networking corresponded to as shown in Figure 3, wherein, bgp neighbor is established between PE1, PE2, main PW is established between CE and PE1, establish standby PW between CE and PE2, based on this, the first equipment is here just the CE in Fig. 3, second equipment is just that provider edge (PE:Provider Edge) the 1, three equipment in Fig. 3 is just the PE2 in Fig. 3.
Be applied to networking as above, the flow process shown in Fig. 2 can be applicable to the second equipment, and it can comprise the following steps:
Step 201, by brush under having the preferred route of same prefix and not preferred route in local bgp routing table to local IP route table.
In bgp routing table, it can comprise the BGP route of BGP form, and also can comprise the route of non-BGP form, such as ARP route, IS-IS route etc., as one embodiment of the present of invention, the route that can limit non-BGP form in bgp routing table is better than BGP route.Based on this, in this step 201, can have the route of same prefix the route such as ARP route selecting a non-BGP form in local bgp routing table is preferred route, and other remaining routes with same prefix are not preferred route.As one embodiment of the present of invention, in actual applications, this not preferred route can be defined as BGP route.
Namely only different by brushing to IP route table under route preferred in bgp routing table from existing route way to manage, in the present invention, can by brush under there is in bgp routing table the preferred route of same prefix and not preferred route to local IP route table, this compared to existing technology, can realize route handoff fast, specifically see below description.
Step 202, from having the route of same prefix in local IP route table select route that priority is the highest as main road by, and select from other remaining routes described main road by alternate routing.
As one embodiment of the present of invention, in this step 202, select the highest route of priority as main road by comprising from having the route of same prefix in local IP route table:
From having the route of same prefix in local IP route table select route that routing protocol priority is the highest as main road by, routing protocol priority is specified in advance.
Such as, the route in local IP route table with same prefix is respectively ARP route, BGP route, IS-IS route, if it is the highest to formulate ARP priority, then ARP route can be selected to be main road by.
As in this step 202, select from other remaining routes described main road by alternate routing, can comprise when specific implementation:
Using the route that meets the following conditions in other remaining routes as described main road by alternate routing: route prefix is identical, Routing Protocol is different, down hop is different.The quantity of the alternate routing selected here does not limit.
Then the citing above, selection ARP route be main road by rear, can based on above-mentioned condition select from remaining BGP route, IS-IS route route such as BGP route as main road by alternate routing.
Step 203, transmits described main road to local FIB by with brush under alternate routing.
When performing this step 203, now the main road transmitted of local FIB is by being used to guide traffic forwarding, and main road by alternate routing be in stand-by state, wouldn't traffic forwarding be instructed.
Step 204, monitor (BFD:Bidirectional Forwarding Detection) session for monitoring main road by the two-way converting of the link of correspondence for local FIB transmits middle main establishing route, described link comprises the link from described first equipment to this second equipment.
Here, as one embodiment of the present of invention, this step 204 main establishing route in transmitting for local FIB, for before monitoring the BFD session of main road by the link of correspondence, can comprise further:
Check whether there is the BFD session linked with described main PW between described first equipment and this second equipment, if, be further used for monitoring described main road by corresponding link by with the BFD session that described main PW links, if not, continue execution and transmit middle main establishing route for monitoring the BFD session of main road by the link of correspondence for local FIB.Can find out, in the present invention, check out to there is the BFD session linked with described main PW between described first equipment and this second equipment time, achieve a BFD session and perform simultaneously and to link with main PW and to monitor described main road by corresponding link, minimizing resource occupation.
Step 205, when BFD session monitors the link failure from described first equipment to this second equipment, from local FIB transmit delete described main road by, select described main road by an alternate routing as new main road is by carrying out traffic forwarding.
Can be found out by step 205, in the present invention, the link from described first equipment to this second equipment of main road by correspondence is monitored by BFD session, and BFD session monitoring can reach the monitoring velocity of Millisecond, when monitoring out from described first equipment to the link failure of this second equipment, second equipment directly from local FIB transmit the described main road of middle selection by an alternate routing as new main road by replace former main road by carrying out traffic forwarding, not as the BGP route of searching same prefix from bgp routing table that background technology describes, brush to FIB routing table by under the BGP route of same prefix, this compares the route handoff that background technology describes, route handoff can be made to arrive Millisecond, realize the quick switching of route.
So far, flow process shown in Fig. 2 is completed.
For the networking of IPRAN shown in Fig. 1, the flow process shown in Fig. 2 is described below:
IPRAN networking as shown in Fig. 1 that background technology describes, flow process shown in composition graphs 2, although then equipment B 1 can think that the ARP route learning to arrive is as preferred route, and the BGP route having a same prefix with this ARP route of issuing from equipment B 2 of receiving is not preferred route, its still can by study to ARP route and equipment B 2 issue there is under the BGP route of same prefix brush to local IP route table, afterwards, in local IP route table from this have the ARP route of same prefix and BGP route select route that priority is the highest using ARP route as main road by, and remaining BGP route, although its with as main road by ARP route route prefix identical, Routing Protocol is different, but down hop is not identical, can as main road by the alternate routing being ARP route, so, can using as main road by ARP route and under the BGP route of alternate routing brush transmit to local FIB.
The step 204 of flow process shown in composition graphs 2, for local FIB transmit middle as main road by ARP establishing route for monitoring the BFD session of main road by the link (link namely between device A and equipment B 1) of correspondence; Now the main road transmitted of local FIB is by being used to guide traffic forwarding, and main road by alternate routing be in stand-by state, wouldn't traffic forwarding be instructed.
When link between device A and equipment B 1 is normal, the Business Stream being sent to main frame a entered from CE first arrives equipment B 1 through following path CE->ER1-> equipment B 1, when equipment B 1 receives Business Stream, based in FIB routing table as main road by ARP route Business Stream is sent to device A, be finally sent to main frame a;
When BFD session monitors the link failure between device A and equipment B 1, equipment B 1 delete from FIB routing table as main road by ARP route, select alternate routing and BGP route as new main road by replace former main road by carrying out traffic forwarding, so, the Business Stream being sent to main frame a entered from CE arrives equipment B 1 through following path CE->ER1-> equipment B 1, when equipment B 1 receives Business Stream, or according to newly switch in above-mentioned FIB routing table main road by BGP route send Business Stream, be finally sent to main frame a.This is compared to relevant devices A in background technology and the description between equipment B 1 during link failure, without the need to returning the BGP route of searching same prefix from bgp routing table again, brush to FIB routing table by under the BGP route of same prefix, this can realize the quick switching of route, reaches Millisecond.
It should be noted that, in the flow process shown in above-mentioned Fig. 2, when from described first equipment to the link of this second equipment from fault recovery, now, second equipment newly will learn the ARP route of the main frame of the first equipment connection, so, the second equipment will by study to ARP routing label to be main road transmitted to local FIB by lower brush, and in being transmitted by local FIB, original and described ARP route has the main road of same prefix by being updated to alternate routing.Then the citing above, if the link between device A and equipment B 1 is from fault recovery, then equipment B 1 will learn the ARP route of the main frame that device A connects, so, the ARP routing label newly learnt will be that main road is transmitted to local FIB by lower brush by equipment B 1, and ARP route that is original and new study has the main road of same prefix by the alternate routing being updated to described ARP route in being transmitted by local FIB, to ensure that final or optimum route instructs traffic forwarding.
Above method provided by the invention is described.Below device provided by the invention is described:
Be structure drawing of device provided by the invention see Fig. 4, Fig. 4.This application of installation is in the second equipment of following networking: establish main pseudo-line PW between the first equipment and the second equipment, establish standby PW between the first equipment and the 3rd equipment, second equipment and the 3rd equipment establish Border Gateway Protocol (BGP) neighbours, as shown in Figure 4, this device comprises:
Bgp routing table administrative unit, for by brush under there is in local bgp routing table the preferred route of same prefix and not preferred route to local IP route table;
IP route table administrative unit, for select from having in the route of same prefix in local IP route table route that priority is the highest as main road by, and select from other remaining routes described main road by alternate routing; Transmitted to local FIB by with brush under alternate routing by described main road, described main road is by being used to guide traffic forwarding, and described alternate routing is in stand-by state;
FIB routing table administrative unit, for transmitting middle main establishing route for local FIB for monitoring the BFD session of main road by the link of correspondence, described link comprises the link from described first equipment to this second equipment;
Route handoff unit, during for monitoring when BFD session from described first equipment to the link failure of this second equipment, from local FIB transmit delete described main road by, select described main road by an alternate routing as new main road by replace former main road by carrying out traffic forwarding.
Preferably, described IP route table administrative unit selects the highest route of priority as main road by comprising from having the route of same prefix in local IP route table:
From having the route of same prefix in local IP route table select route that routing protocol priority is the highest as main road by, routing protocol priority is specified in advance.
Preferably, described IP route table administrative unit select from other remaining routes described main road by alternate routing comprise:
Using the route that meets the following conditions in other remaining routes as described main road by alternate routing:
Route prefix is identical, Routing Protocol is different, down hop is different.
Preferably, described FIB routing table administrative unit is that local FIB transmits middle main establishing route and comprised by the taking a step forward of BFD session of the link of correspondence for monitoring main road:
Check whether there is the BFD session linked with described main PW between described first equipment and this second equipment, if, be further used for monitoring described main road by corresponding link by with the BFD session that described main PW links, if not, continue execution and transmit middle main establishing route for monitoring the BFD session of main road by the link of correspondence for local FIB.
Preferably, described route handoff unit is further when described first equipment is to the link of this second equipment from fault recovery, study is to the ARP route of the main frame of described first equipment connection, by study to ARP routing label to be main road transmitted to local FIB by lower brush, and in being transmitted by local FIB, original and described ARP route has the main road of same prefix by being updated to alternate routing.
So far, the structure drawing of device shown in Fig. 4 is completed.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a route fast switch over method, the method is applied to following networking: establish main pseudo-line PW between the first equipment and the second equipment, establish standby PW between the first equipment and the 3rd equipment, second equipment and the 3rd equipment establish Border Gateway Protocol (BGP) neighbours, it is characterized in that, the method is applied to described second equipment, comprising:
By brush under there is in local bgp routing table the preferred route of same prefix and not preferred route to local IP route table; From having the route of same prefix in local IP route table select route that priority is the highest as main road by, and select from other remaining routes described main road by alternate routing;
Transmitted to local FIB by with brush under alternate routing by described main road, described main road is by being used to guide traffic forwarding, and described alternate routing is in stand-by state;
For local FIB transmits middle main establishing route for monitoring the BFD session of main road by the link of correspondence, described link comprises the link from described first equipment to this second equipment;
When BFD session monitors the link failure from described first equipment to this second equipment, from local FIB transmit delete described main road by, select described main road by an alternate routing as new main road by replace former main road by carrying out traffic forwarding.
2. method according to claim 1, is characterized in that, describedly selects the highest route of priority as main road by comprising from having the route of same prefix in local IP route table:
From having the route of same prefix in local IP route table select route that routing protocol priority is the highest as main road by, routing protocol priority is specified in advance.
3. method according to claim 1, is characterized in that, described select from other remaining routes described main road by alternate routing comprise:
Using the route that meets the following conditions in other remaining routes as described main road by alternate routing:
Route prefix is identical, Routing Protocol is different, down hop is different.
4. method according to claim 1, is characterized in that, describedly transmits middle main establishing route and is comprised by the taking a step forward of BFD session of the link of correspondence for monitoring main road for local FIB:
Check whether there is the BFD session linked with described main PW between described first equipment and this second equipment, if, be further used for monitoring described main road by corresponding link by with the BFD session that described main PW links, if not, continue execution and transmit middle main establishing route for monitoring the BFD session of main road by the link of correspondence for local FIB.
5. method according to claim 1, is characterized in that, the method comprises further:
When described first equipment is to the link of this second equipment from fault recovery, described second learning equipment is to the ARP route of the main frame of described first equipment connection, by study to ARP routing label to be main road transmitted to local FIB by lower brush, and in being transmitted by local FIB, original and described ARP route has the main road of same prefix by being updated to alternate routing.
6. a route apparatus for fast switching, this application of installation is in the second equipment of following networking: establish main pseudo-line PW between the first equipment and the second equipment, establish standby PW between the first equipment and the 3rd equipment, second equipment and the 3rd equipment establish Border Gateway Protocol (BGP) neighbours, it is characterized in that, this device comprises:
Bgp routing table administrative unit, for by brush under there is in local bgp routing table the preferred route of same prefix and not preferred route to local IP route table;
IP route table administrative unit, for select from having in the route of same prefix in local IP route table route that priority is the highest as main road by, and select from other remaining routes described main road by alternate routing; Transmitted to local FIB by with brush under alternate routing by described main road, described main road is by being used to guide traffic forwarding, and described alternate routing is in stand-by state;
FIB routing table administrative unit, for transmitting middle main establishing route for local FIB for monitoring the BFD session of main road by the link of correspondence, described link comprises the link from described first equipment to this second equipment;
Route handoff unit, during for monitoring when BFD session from described first equipment to the link failure of this second equipment, from local FIB transmit delete described main road by, select described main road by an alternate routing as new main road by replace former main road by carrying out traffic forwarding.
7. device according to claim 6, is characterized in that, described IP route table administrative unit selects the highest route of priority as main road by comprising from having the route of same prefix in local IP route table:
From having the route of same prefix in local IP route table select route that routing protocol priority is the highest as main road by, routing protocol priority is specified in advance.
8. device according to claim 6, is characterized in that, described IP route table administrative unit select from other remaining routes described main road by alternate routing comprise:
Using the route that meets the following conditions in other remaining routes as described main road by alternate routing:
Route prefix is identical, Routing Protocol is different, down hop is different.
9. device according to claim 6, is characterized in that, described FIB routing table administrative unit is that local FIB transmits middle main establishing route and comprised by the taking a step forward of BFD session of the link of correspondence for monitoring main road:
Check whether there is the BFD session linked with described main PW between described first equipment and this second equipment, if, be further used for monitoring described main road by corresponding link by with the BFD session that described main PW links, if not, continue execution and transmit middle main establishing route for monitoring the BFD session of main road by the link of correspondence for local FIB.
10. device according to claim 6, it is characterized in that, described route handoff unit is further when described first equipment is to the link of this second equipment from fault recovery, study is to the ARP route of the main frame of described first equipment connection, by study to ARP routing label to be main road transmitted to local FIB by lower brush, and in being transmitted by local FIB, original and described ARP route has the main road of same prefix by being updated to alternate routing.
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| CN110086711A (en) * | 2019-04-29 | 2019-08-02 | 新华三技术有限公司 | Flow switchback method, apparatus, electronic equipment and readable storage medium storing program for executing |
| CN111654434A (en) * | 2020-04-08 | 2020-09-11 | 新华三信息安全技术有限公司 | Flow switching method and device and forwarding equipment |
| CN111654434B (en) * | 2020-04-08 | 2022-05-27 | 新华三信息安全技术有限公司 | Flow switching method and device and forwarding equipment |
| CN111614554A (en) * | 2020-05-20 | 2020-09-01 | 中国联合网络通信集团有限公司 | Route switching method, control device, multi-route network system and storage medium |
| CN112637053A (en) * | 2020-12-30 | 2021-04-09 | 锐捷网络股份有限公司 | Method and device for determining backup forwarding path of route |
| CN112637053B (en) * | 2020-12-30 | 2022-05-20 | 锐捷网络股份有限公司 | Method and device for determining backup forwarding path of route |
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| CN104767680B (en) | 2018-05-25 |
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