WO2011140890A1 - Method and device for realizing fast reroute - Google Patents

Method and device for realizing fast reroute Download PDF

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Publication number
WO2011140890A1
WO2011140890A1 PCT/CN2011/073064 CN2011073064W WO2011140890A1 WO 2011140890 A1 WO2011140890 A1 WO 2011140890A1 CN 2011073064 W CN2011073064 W CN 2011073064W WO 2011140890 A1 WO2011140890 A1 WO 2011140890A1
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WO
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Prior art keywords
standby
table
next hop
path
service
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Application number
PCT/CN2011/073064
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French (fr)
Chinese (zh)
Inventor
钱勇
孙蓓
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/22Alternate routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/28Route fault recovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/50Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]

Abstract

Disclosed are a method and device for realizing fast reroute. The method includes the following steps: configuring a tunnel default service and other services to use the same master-slave switch table; detecting whether the status of the master route is normal, and when the master route is determined to be failure, setting the master-slave switch table and switching the tunnel default service and other services to the designated slave route. With the present invention, the fast switch of all the services beared on the tunnel is realized in the scope of the performance requirement, and the burden of the tunnel control layer is greatly relieved.

Description

TECHNICAL FIELD The method and apparatus for fast reroute

The present invention relates to communications technologies, and in particular relates to a method and apparatus to achieve fast rerouting. Background technique

Fast Reroute (FRR, Fast ReRoute) technology is a mechanism to link and node protection, to protect the main path through which the backup path when the primary path fails, the data on the main flow path is quickly switched to the backup path, to ensure that business data continues to flow.

Currently, there are methods to achieve the following application FRR in the tunnel network technologies:

Method One: rewriting forwarding table information, forwarding information about to the main path to update the forwarding information backup path in order to achieve FRR. Method One drawback is: in the process of forwarding the information updated, the data flow because there is not complete and forward the information packet loss, and may even lead to unusual problems, at the same time, when the tunnel is more business, due to the occurrence of the tunnel forwarding path changes, the information required for forwarding all traffic flows are carried by corresponding update operation, the control plane overhead great, but also not meet all of the services carried in the completion of the handover performance requirements of 50 milliseconds.

Method two: increasing the switching flag in the forwarding table, and record the main path and the backup path information is forwarded from the main path or a backup path through the switch flag selected in order to achieve FRR, disadvantage of this approach is that: if the tunnel carrying a plurality of traffic streams , and the primary path fails, the control module required to operate forwarding tunnel bearer of all services (such as: routing table, the MAC table, the tag table, etc.) switching flag, also greatly increases the burden on the control plane, also difficult to ensure that all services carried in the handover performance to protect the required range (e.g. less than 50 milliseconds) the performance requirements.

In summary, the method of application of two prior art FRR tunnel in the network technology, we can not guarantee that all operations at the time of carrying a plurality of traffic tunnel, if the main path fails, carried on the main path can be quickly switch to the backup tunnel path within the range of performance requirements. SUMMARY

In view of the above analysis, the present invention aims to provide a method and apparatus for implementing fast reroute, carrying a plurality of tunnels in service, to ensure that all traffic carried on primary paths fail tunnel quickly switch to within the range of performance requirements Preparation of the tunnel path.

The main object of the present invention is achieved by the following technical solution:

The present invention provides a method for fast reroute, comprising:

A, configure the tunnel default service and other services using the same standby switching table;

B, the detection of the main path status is normal, when it is confirmed the primary path fails, the standby switching table query, the default operational tunnel and the backup path to switch to other services selected.

Further, the step A comprises:

In the process of establishing the tunnel, the tunnel creates forwarding service corresponding to the next hop information table standby, and the standby switching table; when the tunnel is other services, create the corresponding forwarding service corresponding to the service, the next standby hop information table; next hop of the tunnel corresponding to the standby next hop information table standby service information table corresponding to the respective index common to the standby switching table.

Further, when the standby switching table comprising a standby switch flag and the backup path selection information, said step B comprises:

BL, state of the host tunnel path is normal, when it is confirmed the primary path fails, the primary standby disposed in the switching table standby switch flag and the backup path selection information;

B2, when receiving the tunnel switch service or other default data transmission services, and the backup path selection switch flag information of said query through said switching table in the standby standby main path selects the next hop or next hop backup path to forward data.

Further, when the next hop information table includes primary and standby switching table index, the next hop main path information and next hop backup path information, the step B2 comprises: B21, upon receiving the tunnel switch default data transmission service or other services, to find the forwarding service corresponding to the service, and forwarding index to the corresponding standby next hop information table according to the service;

B22, find the standby switching table according to the next hop information table, primary and standby switching table index, determined from a main path or a backup path according to the switching table in the standby standby switching flag data forwarding, if it is determined from the main forwarding path, the main path according to the data forwarding next hop in the next hop information table in the standby; if it is determined to forward data from the backup path, according to the switching table further standby Preparation of path selection information corresponding to the backup path information of the next hop to forward data.

The present invention also provides an apparatus for fast reroute, comprising: a configuration module and a re-routing module, wherein

A configuration module for configuring the tunnel default service and other services using the same standby switching table; whether rerouting module, for detecting a state of normal primary path when the primary path fails to confirm, querying the standby switching table , the default service tunnel and the other services are switched to the selected backup path.

Further, the configuration module is configured to, in the process of establishing a tunnel, creating a corresponding service tunnel forwarding table, the next hop information table standby, and the standby switching table; when the tunnel is other services, create the corresponding forwarding service corresponding to the service, the next hop information table standby; tunnel corresponding to the next hop information table standby standby next hop information table corresponding to the respective service to the standby common index switching table.

Further, when the standby switching table comprising a standby switch flag and the backup path selection information, the re-routing module comprises: forwarding a query unit and a detection unit, wherein,

The detecting unit for detecting the state of the primary path is normal, when it is confirmed the primary path fails, the primary standby disposed in the switching table standby switch flag and the backup path selection information;

Forwarding the query means, when receiving the tunnel default data transmission service or other services, the selection information of the query by the active and standby switching table in standby switch flag and the backup path selects the next hop or the primary path Preparation of the next hop to forward data path.

Further, when the next hop information table when the primary and standby switching table includes an index, the next hop main path information and next hop backup path information, the query is forwarded unit is configured to, upon receiving the default service tunnel or other data transmission services, the service corresponding to the service to find the forwarding table, and forwarding index to the corresponding standby next hop information table according to the service; according to the next hop information table in the standby master standby switch table index to find the active and standby switching table, determined forward data from a main path or a backup path according to the switching table in the standby standby switch flag, if it is determined from the main path forwarding is based on the lower next hop hop information standby main path information table, forwards data; if it is determined to forward data from the backup path, further selection information corresponding to the next-hop backup path to the backup path information according to the switchover table to forward data.

Advantageous effects of the present invention are as follows:

The present invention is a standby switch using the same entries by configuring all traffic carried by the tunnel, among all businesses to quickly switch to the backup path tunnel more quickly switched to the backup path in the range of performance requirements.

Other features and advantages of the invention will be set forth in the description which follows, and in part will become apparent from the description, or learned by practice of the present invention. The objectives and other advantages of the invention may be realized and attained by the written description, claims, and drawings structure particularly pointed out. BRIEF DESCRIPTION

FIG 1 is a schematic flow achieved mainly of fast re-routing method of the present invention;

The method of the present invention, FIG. 2 in the fast reroute, it tunnel forwarding relationship schematic bearer service;

FIG 3 FRR implementation of the present invention, a schematic view of the structure of the primary and the next hop information table; FIG. 4 embodiment implements a method FRR, the tunnel switching in process schematic configuration of the present invention;

The method of FIG. 5 embodiment enables fast rerouting of the present invention, the tunnel switching process schematic;

6 embodiment method implemented in the FRR present invention, a schematic diagram of an MPLS TE tunnel bearer service implementation process of fast switching;

FIG 7 is a schematic structure of an apparatus to realize the fast reroute the present invention. detailed description

Below with the accompanying drawings preferred embodiments of the present invention is specifically described, which drawings form a part of this application, and together with the embodiments of the present invention to explain the principles of the present invention. For purposes of clarity and simplicity, when it may obscure the subject matter of the present invention, the detailed description of known functions and detailed structure of the device described herein omitted.

First, 1 to Figure 6 the method of the present invention is described in detail in conjunction with the accompanying drawings.

The main method is shown in a schematic flowchart shown in FIG. 1 of the present invention achieves a fast reroute, specifically include the following steps:

Step 101: Configure a tunnel default service and other services using the same standby switching table.

This step specifically includes: a tunnel establishment procedure, the need to create a control plane of the tunnel forwarding table, tunnel corresponding to the next hop information table and a standby standby switching table; except when the default bearer tunnel establishment operations outside, the tunnel may also carry other traffic, when the carry other traffic tunnel, creating a corresponding service and the corresponding service forwarding standby next hop information table.

2, FIG. 2 is a schematic diagram of the relationship between the tunnel and its forwarding bearer traffic, wherein the tunnel forwarding table corresponding to respective entries included in the default bearer service when the tunnel is established, and because the default bearer service requires different tunnels tunnel forwarding table may vary, e.g., a default bearer traffic tunnel IP service, the tunnel forwarding table corresponding to the IP address table; FIG. 3, FIG. 3 as the next hop standby schematic configuration information table, the next hop information table standby tunnel corresponding to the tunnel comprises a main path default hop information service, the next-hop backup path information, the switchover table index, which has a main path information, backup path information may have one or more, each of the main path or the backup path information includes information of the next hop path and each outlet package information, the switchover table index using the standby switching table entry; simultaneously, tunnel corresponding to the next hop information table in the standby standby switching table contains the selection marker and the primary and backup routing information for forwarding data over In preparation selected by querying the primary standby switching table flag, decided to forward data from a main path or a backup path, if the forwarding from the backup path is further selected based on the backup path at the switchover table selects any one of them Preparation forwarding path; default bearer traffic in addition to the tunnel, but may also carry one or more other services, creating a corresponding service and the corresponding service forwarding standby next hop information table, other operations due to the need of the different tunnel bearer, different business services forwarding may be different, such as the MAC address table may, routing table, label table, IP addresses table; as shown, the structure of the tunnel corresponding to the corresponding service standby next hop information table 3 the default next-hop corresponding to the service information table standby similar structure (particularly different items table), comprising a main path next hop information, backup path information, the switchover table index, which has a main path information, backup path information may have one or more, each of the main path or the backup path information comprises next-hop information and each passage Outlet encapsulation information; the same time, the primary and the next hop information table corresponding to the respective service also contains the switchover table index, the standby switching table is indexed using the same standby switching table entry created tunnel.

Step 102: when the tunnel is detected the primary path fails, the control plane is provided the tunnel created by the primary standby switching table Prepared selectable marker and a backup path selection information, the tunnel default service and other services are quickly switched to the standby path.

Since all of the traffic carried in the tunnel forwarding table entry is the same query a standby switching table, this implementation ensures that all bearer service tunneling can achieve fast switching performance within the required range, and greatly reduce the the burden on the control plane.

To facilitate understanding of the present invention, it will be below 1: Traffic Engineering (MPLS TE, Traffic Engineering) tunnel will be specifically described in Example 1 path protection mode. As shown, FIG. 4 is a schematic flow diagram of the switching configuration of a tunnel 4 may specifically include the following steps:

Step 401: establishing an MPLS TE tunnel main path and backup path, associated FRR is formed;

Step 402: Create MPLS TE tunnels corresponding service forwarding tunnel corresponds standby next hop information table, and the standby switching table;

Step 403: configure other services, such as: L2 of Virtual Private Network (VPN) service, L3 VPN service layer, and the like;

Step 404: Create each other corresponding to each service forwarding, standby next hop information table, the next hop main path and a backup path information corresponding service information stored in the standby next hop information table entry corresponding to the in;

Step 405: the index table stored standby switching MPLS TE tunnels created in the next hop information table other primary and corresponding to each service;

Step 406: Configure end.

As shown, FIG. 5 is a schematic flow diagram of a tunnel switching processing 5 may specifically include the following steps:

Step 501: the forwarding plane by the link detection method (such as BFD detection) to detect the MPLS TE tunnel main path state;

Step 502: determining whether the state of the main path MPLS TE tunnel normal, if there is a failure, step 503 is executed; otherwise, returns to step 501;

Step 503: Set primary MPLS TE tunnels created in the primary and standby switching table and a backup path selection switch flag information, MPLS TE tunnels main and backup path switching.

6, FIG. 6 is a schematic flow chart of fast switching MPLS TE tunnel bearer service implementation may specifically include the following steps:

Step 601: the switch receiving the tunnel MPLS TE tunnel bearer service or other default data transmission services;

Step 602: According to the relevant information of the Gen only data (MAC address, IP address, etc.) to find the corresponding forwarding service, returns the next hop information table index standby service forwarding table; Step 603: The standby next hop information table corresponding to the index to find the next hop information table standby, the main return path information of the next hop standby next hop information table, the next hop backup path information, and the standby switching table index;

Step 604: The standby switching table index to the standby switching table query, returns to the main table in the standby switching apparatus selection marker and the backup path selection information;

Step 605 ~ Step 607: determining whether the master and slave selection flag is set, if the bit is set, step 606 is executed, i.e., the step of selecting the main path 603 to return the next hop information, and proceeds to step 608; otherwise, step 607 is executed, i.e., further hop selection information in which a backup path information, and proceeds to step 608 in accordance with step 603 returns the backup path;

Step 608: forwarding to the respective next-hop device package according to the next hop outlet main path or the next hop information backup path information for data processing.

7 of the accompanying drawings embodiments of the present invention is described in detail below in conjunction with apparatus.

As shown in FIG 7, FIG 7 is a schematic diagram of the structure of the apparatus embodiment of the invention, specifically comprising: a configuration module and a re-routing module, wherein

A configuration module for configuring the tunnel default service and other services using the same standby switching table; specifically for the process configuration module to establish the tunnel, the tunnel is created corresponding to the forwarding service, the next hop information table standby, standby and switching table; when the tunnel is other services, create the corresponding forwarding service corresponding to the service, the next hop information table standby; tunnel corresponding to the next hop information table standby standby next hop information table corresponding to the corresponding service together index table to standby switching.

Re-routing module, for detecting the state of the primary path is normal, when it is confirmed the primary path fails, the primary and secondary switching table, the default tunnel switching service and other services to the selected backup path. The standby switching table comprising: a standby switch flag and the backup path selection information, this time rerouting module specifically comprises: a detection unit and the forwarding unit queries, wherein

Detecting means for detecting a state of the primary path is normal, when it is confirmed the primary path fails, the primary and standby switching flag in the switching table selection information and the backup path; query forwarding unit, for receiving the default service tunnel or other data transmission services, the switchover flag backup path selection information and the main path or the backup path to the next hop to forward data by querying the primary standby switching table.

The standby next hop information table comprising: a standby switching table index, the next hop main path information and next hop backup path information, at this time may be used to query the forwarding unit is, upon receiving the default service or other service tunnel data transmission service to find the forwarding table corresponding to the service, and forwarding the index corresponding to the next hop information table according to the service standby; found according to the following standby standby hop information table standby switching table index switching table, in accordance with the switchover table standby switch flag is determined to forward data from a main path or a backup path, if it is determined from the main forwarding path, the main path according to the next hop standby next hop information table data forwarding; if it is determined to forward data from the backup path, the backup path is further selected based on the switchover table to select the appropriate next hop routing information to forward data backup.

In summary, the present invention, the tunnel through some fault detection methods, such as BFD link state detection (BFD, Bidirectional Forwarding Detection) technique and the like, when the primary path fails, the tunnel handoff trigger occurs, the control plane only needs to be set standby switching table tunnel created standby select flag and the backup path selection information, then all traffic carried on the tunnel at the time of forwarding the query to the same standby switching entries, enabling all businesses to more quickly switch the backup path to ensure that all bearer service tunneling can achieve fast switching performance within the required range, and greatly reduces the burden on the control plane.

Above, the present invention is merely preferred specific embodiments, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed can be easily thought of the changes or Alternatively, it shall fall within the protection scope of the present invention. Accordingly, the scope of the present invention, the scope of the claims should prevail.

Claims

Claims
1, a fast rerouting implemented method, characterized by comprising:
A, configure the tunnel default service and other services using the same standby switching table;
B, the detection of the main path status is normal, when it is confirmed the primary path fails, the standby switching table query, the default operational tunnel and the backup path to switch to other services selected.
2. The method according to claim 1, wherein the step A specifically comprises: in the process of establishing a tunnel, the tunnel creates forwarding service corresponding to the next hop information table standby, and the standby switching table; when the tunnel is other services, create the corresponding forwarding service corresponding to the service, the next hop information table standby; next hop of the tunnel corresponding to the standby next-hop information table corresponding to the respective service standby common information table indexed to the standby switching table.
3. The method of claim 1 or claim 2, wherein, when the active and standby switching table comprising a standby switch flag and the backup path selection information, said step B comprises:
BL, the detection of the main path of the tunnel state is normal, when it is confirmed the primary path fails, the primary standby disposed in the switching table standby switch flag and the backup path selection information;
B2, when receiving the tunnel switch service or other default data transmission services, and the backup path selection switch flag information of said query through said switching table in the standby standby main path selects the next hop or next hop backup path to forward data.
4. The method according to claim 3, wherein, when the switchover table index, the next hop main path information and next hop backup path information when the standby next hop information table comprises the step of B2 comprises:
B21, upon receiving the tunnel switch service or other default data transmission services, to find the forwarding service corresponding to the service, and forwarding index to the corresponding standby next hop information table according to the service;
B22, find the standby switching table according to the next hop information table, primary and standby switching table index, determined from a main path or a backup path according to the switching table in the standby standby switching flag data forwarding, if it is determined from the main forwarding path, the main path according to the data forwarding next hop in the next hop information table in the standby; if it is determined to forward data from the backup path according to the switching table in the standby the backup path selection information corresponding to the backup path information of the next hop to forward data.
5. An apparatus for the realization of fast reroute, characterized in that, comprising: a configuration module and a re-routing module, wherein
A configuration module for configuring the tunnel default service and other services using the same standby switching table; whether rerouting module, for detecting a state of normal primary path when the primary path fails to confirm, querying the standby switching table , the default service tunnel and the other services are switched to the selected backup path.
6. The apparatus as claimed in claim 5, wherein the configuration module is configured to establish a tunnel during tunneling to create the corresponding forwarding service, the next hop information table standby, standby and switching table; when the tunnel is other services, create the corresponding forwarding service corresponding to the service, the next hop information table standby; next hop of the tunnel corresponding to the standby table corresponding to service information corresponding to the next standby hop information table index common to the active and standby switching table.
7. The apparatus of claim 5 or claim 6, wherein, when the active and standby switching table comprising a standby switch flag and the backup path selection information, the re-routing module comprises: a detection unit and a forwarding unit queries , among them,
Detecting means for detecting a state of the primary path is normal, when it is confirmed the primary path fails, the standby switch is provided in the table standby switch flag and the backup path selection information; query forwarding unit, for upon receiving the tunneling service or other default data service transmission, the inquiry by the active and standby switching table in the standby switch flag backup path selection information and a next hop backup primary path or the next hop to forward data path .
8. The apparatus of claim 7, wherein, when the next hop information table when the primary and standby switching table includes an index, the next hop main path information and next hop backup path information, the query the forwarding unit is configured to, upon receiving the service tunnel default data transmission or other services, to find the forwarding service corresponding to the service, and forwarding the index corresponding to the next hop information table according to the standby service; the the standby switching standby next hop table index information table, find the standby switching table, determined forward data from a main path or a backup path according to the switching table in the standby standby switching flag, If it is determined from the primary path forwarding, forwarding is performed based on the main data path of the next hop standby next hop information table; if it is determined to forward data from the backup path, the apparatus further standby switching table in accordance with path selection information corresponding to the backup path information of the next hop to forward data.
PCT/CN2011/073064 2010-05-12 2011-04-20 Method and device for realizing fast reroute WO2011140890A1 (en)

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CN101827034A (en) * 2010-05-12 2010-09-08 中兴通讯股份有限公司 Method and device for realizing quick rerouting
CN102006227A (en) * 2010-11-23 2011-04-06 中兴通讯股份有限公司 Method and device for determining forwarding path in pseudo-wire (PW) dual homing protection environment
CN102291168A (en) * 2011-08-31 2011-12-21 航天东方红卫星有限公司 A satellite injection method of the remote control data
WO2013044408A1 (en) * 2011-09-27 2013-04-04 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for path switching
CN104168057A (en) * 2013-05-20 2014-11-26 中兴通讯股份有限公司 Main/standby link switching method, device and system
CN103973498B (en) * 2014-05-22 2017-09-15 新华三技术有限公司 A multi-standby home network path selection methods and apparatus

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