WO2015184730A1

WO2015184730A1 - Primary and alternate routing equipment, and backup, switching method and routing system therebetween

Info

Publication number: WO2015184730A1
Application number: PCT/CN2014/090077
Authority: WO
Inventors: 梁树国
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-07-08
Filing date: 2014-10-31
Publication date: 2015-12-10
Also published as: CN105306358A

Abstract

Provided are primary and alternate routing equipment and backup, switching method and routing system therebetween, the backup method between the primary and alternate routing equipment comprising: prior to switching the primary and alternate routing equipment, the primary routing equipment sends the learned address resolution protocol entries of the user to the alternate routing equipment according to preset rules; the alternate routing equipment receives and learns the address resolution protocol entries. Prior to switching the primary and alternate routing equipment, the method provided by the present invention enables the primary routing equipment to send the learned address resolution protocol entries of the user to the alternate routing equipment to enable the alternate routing equipment to learn the address resolution protocol entries in advance. When the primary and alternate routing equipment switch, the alternate routing equipment, having learned the address resolution protocol entries of the user, can directly forward the downlink traffic of the user according to the address resolution protocol entries, thus accelerating the switching speed between the primary and alternate routing equipment.

Description

Backup, switching method and routing system between primary and backup routing devices and devices

Technical field

The present invention relates to the field of communications, and in particular, to a backup, handover method, and routing system between a primary and backup routing device and a device.

Background technique

VRRP (Virtual Router Redundancy Protocol) divides a group of routing devices on a LAN into one backup group. A backup group consists of a master routing device (primary routing device) and multiple backup routing devices (alternate routing devices), which is equivalent to a virtual routing device.

The forwarding task is performed by the master routing device. When the routing device works normally, the upstream and downstream traffic of the user is forwarded by the master routing device. If the link fault occurs on the primary routing device, the backup device detects that the primary device is faulty. State switching, the upstream traffic is directed to the new primary routing device (that is, the alternate routing device); the downstream traffic is routed to the new primary routing device through the route convergence, but when forwarding to the user, there is no user ARP. The (Address Resolution Protocol) entry needs to initiate ARP learning, resulting in loss of traffic.

A method for protecting an access ring is disclosed in the Chinese Patent Application No. 101800774A, which is an access ring protection method and an access ring protection network. The method includes: the aggregation ring forwards only Layer 3 packets and the access ring only forwards A Layer 2 packet, and each of the access nodes of the access ring configures the dual gateways that are uplinked to the core node by using the two aggregation nodes as the primary and secondary gateways respectively. The access node accesses the L3VPN through the active and standby PWs of the L2VPN. The access point (aggregation node) of each L2/L3 needs to learn thousands of ARP entries. Therefore, the method also has the following problem: When the primary node fails, if there is no corresponding ARP entry on the standby node, the data flow is used to re-trigger the learning of the ARP entry. A large number of ARP entries can cause the CPU to increase overhead in a short period of time, and may even cause the control plane to be interrupted for a short period of time, failing to meet the 50 ms switching requirement.

Therefore, in the prior art, when the primary and secondary routing devices perform the handover, the backup routing device needs to learn the ARP entry, which causes an increase in the switching time.

Summary of the invention

The main technical problem to be solved by the present invention is to provide a backup and handover method and a routing system between the primary and secondary routing devices and the devices. In the prior art, when the primary and secondary routing devices perform the handover, the secondary routing device needs to learn the user. The ARP entry causes a problem of increased switching time.

In order to solve the above technical problem, the embodiment of the present invention provides a backup method between the primary and backup routing devices, including: before the primary and secondary routing device switches, the primary routing device searches the address resolution protocol table of the learned user according to a preset rule. The item is sent to the alternate routing device; the alternate routing device receives and learns the address resolution protocol entry.

In an embodiment of the present invention, the preset rule is: the primary routing device periodically sends the learned address resolution protocol entry of the user to the standby routing device; or the primary routing device is learned by the user. When the number of address resolution protocol entries reaches the preset value, it is sent to the alternate routing device.

In an embodiment of the present invention, before the primary routing device sends the learned address resolution protocol entry to the backup routing device according to the preset rule, the method further includes: configuring between the primary routing device and the standby routing device. Cross-rack backup group.

In an embodiment of the present invention, the method includes the foregoing steps in the backup method between the primary and backup routing devices, and further includes: when the primary standby routing device switches, the standby routing device performs downlink traffic of the user according to the address resolution protocol entry. Forward.

The embodiment of the present invention further provides a backup method between the primary and secondary routing devices, including: before the primary and secondary routing device switches, the primary routing device sends the learned address resolution protocol entry to the standby according to the preset rule. Routing device for learning by the alternate routing device.

The embodiment of the present invention further provides a backup method between the primary and secondary routing devices, including: before the primary and secondary routing device switches, the standby routing device receives the address resolution protocol entry of the user sent by the primary routing device; Address resolution protocol entry.

The embodiment of the present invention further provides a method for switching between primary and secondary routing devices, including the steps in the backup method between the primary and secondary routing devices, and the following: the standby routing device performs downlink traffic of the user according to the address resolution protocol entry. Forwarding.

The embodiment of the present invention further provides a routing system, including: an active routing device and at least one standby routing device, where the primary routing device is configured to learn the primary routing device according to a preset rule before the primary standby routing device switches. The address resolution protocol entry of the user is sent to the alternate routing device; the alternate routing device is configured to receive and learn the address resolution protocol entry.

In an embodiment of the present invention, the primary routing device is configured to periodically send the address resolution protocol entry of the user that it learns to the backup routing device; or the address resolution protocol entry of the user that it learns. When the number reaches the preset value, it is sent to the alternate routing device.

In an embodiment of the present invention, the routing system further includes a processor, configured to configure the primary use before the primary routing device sends the address resolution protocol entry of the learned user to the backup routing device according to a preset rule. A cross-rack backup group between a routing device and an alternate routing device.

In an embodiment of the present invention, the backup routing device is further configured to forward the downlink traffic of the user according to the address resolution protocol entry when the primary standby routing device switches.

The embodiment of the present invention further provides a primary routing device, including: a sending module, configured to send the learned address resolution protocol entry of the learned user to the standby routing device according to a preset rule before the primary standby routing device switches. For learning by the alternate routing device.

The embodiment of the present invention further provides an alternate routing device, including: a receiving module and a learning module; the receiving module is configured to receive an address resolution protocol entry of the user sent by the primary routing device before the primary standby routing device switches; the learning module Set to learn address resolution protocol entries.

In an embodiment of the present invention, the forwarding module is further configured to perform forwarding of the downlink traffic of the user according to the address resolution protocol entry.

The beneficial effects of the invention are:

The present invention provides a backup, handover method, and a routing system between the primary and backup routing devices and the device. The backup method between the primary and secondary routing devices includes: before the primary and secondary routing devices switch, the primary routing device learns according to a preset rule. The address resolution protocol entry of the user is sent to the standby routing device; the alternate routing device receives and learns the address resolution protocol entry. The method provided by the present invention sends the learned address resolution protocol entry of the learned user to the standby routing device, so that the standby routing device can learn the address resolution protocol of the user in advance, before the primary routing device performs the primary and secondary routing device switching. Entry. When the primary and secondary routing devices switch, the secondary routing device learns the address resolution protocol entries of the user. Therefore, the downlink traffic of the user can be directly forwarded according to the address resolution protocol entry, thereby saving the learning address resolution protocol table. The time of the item speeds up the switching speed between the primary and secondary routing devices.

DRAWINGS

1 is a schematic flowchart of a backup method between primary and backup routing devices according to Embodiment 1 of the present invention;

2 is a schematic flowchart of a backup method between primary and backup routing devices according to Embodiment 2 of the present invention;

3 is a schematic flowchart of a method for switching between primary and backup routing devices according to Embodiment 3 of the present invention;

4 is a schematic flowchart of a method for backing up between primary and backup routing devices according to Embodiment 5 of the present invention;

FIG. 5 is a schematic flowchart of a method for backing up between primary and backup routing devices according to Embodiment 6 of the present invention;

6 is a schematic structural diagram of a routing system according to Embodiment 7 of the present invention;

FIG. 7 is a schematic structural diagram of another routing system according to Embodiment 7 of the present invention;

FIG. 8 is a schematic structural diagram of an alternate routing device according to Embodiment 9 of the present invention; FIG.

FIG. 9 is a schematic structural diagram of another alternate routing device according to Embodiment 9 of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

This embodiment provides a backup method between the primary and secondary routing devices. Referring to FIG. 1, the method includes the following steps:

Step S101: Before the primary and secondary routing device switches, the primary routing device sends the learned address resolution protocol entry of the learned user to the standby routing device according to a preset rule.

Step S102: The alternate routing device receives and learns the address resolution protocol entry.

In this embodiment, before the primary and secondary routing devices perform the handover, the forwarding task is performed by the primary routing device. When the primary routing device works normally, the uplink and downlink traffic of the user are forwarded by the primary routing device. The primary routing device needs to learn the address resolution protocol entry (ie, the ARP entry) of the user before forwarding the downlink traffic of the user. In the foregoing step S101, the primary routing device sends the ARP entry to the backup routing device. If the primary routing device learns the ARP entries of multiple users, the ARP entries of all the learned users can be sent to the alternate routing device.

In the foregoing step S101, the preset rule may be: the primary routing device periodically sends the learned address resolution protocol entry of the user to the standby routing device; or the primary routing device searches the address of the learned user. When the number of protocol entries reaches the preset value, it is sent to the alternate routing device, where the preset value may be one or more.

Before the step S101, the method further includes: configuring an Inter-Chassis Backup Group (ICBG) between the primary routing device and the standby routing device.

In the above step S101, the primary and secondary routing devices send the ARP entry to the standby routing device in multiple manners. This embodiment provides a preferred mode: the communication protocol used by the primary routing device between the primary and secondary routing devices. Bind the address resolution protocol entry of the user to the alternate routing device through the communication protocol. Further, the communication protocol may be an Inter-Chassis Communication Protocol (ICCP) or a Service Information Backup Protocol (SIBP).

After the foregoing step S101, the standby routing device has learned the ARP entry of the user, so that the ARP entry can be used to forward the downlink traffic of the user when the primary and secondary routing devices perform the handover.

Embodiment 2:

The embodiment provides a backup method between the primary and secondary routing devices. In the backup method, the primary routing device periodically sends the learned address resolution protocol entry to the backup routing device. When it arrives, the ARP entry that needs to be backed up to the standby routing device is sent to the alternate routing device. Referring to FIG. 2, the backup method specifically includes the following steps:

Step S201: configuring an ICBG of the primary routing device and the standby routing device;

Step S202: indicating an ICCP connection used between the primary and backup routing devices;

Step S203: Binding an ARP entry to the used ICCP connection.

Step S204: When the set period is reached, the primary routing device sends the ARP entry to be backed up to the standby routing device.

Step S205: The standby routing device receives and learns the ARP entry.

Embodiment 3:

This embodiment provides a method for switching between primary and backup routing devices. Referring to FIG. 3, the method includes the following steps:

Step S301: Before the primary and secondary routing device switches, the primary routing device sends the learned address resolution protocol entry of the learned user to the standby routing device according to a preset rule.

Step S302: The standby routing device receives and learns the address resolution protocol entry.

Step S303: When the primary and secondary routing devices switch, the standby routing device forwards the downlink traffic of the user according to the address resolution protocol entry.

In this embodiment, before the primary and secondary routing devices perform the handover, the forwarding task is performed by the primary routing device. When the primary routing device works normally, the uplink and downlink traffic of the user are forwarded by the primary routing device. The primary routing device needs to learn the address resolution protocol entry (ie, the ARP entry) of the user before forwarding the downlink traffic of the user. In the foregoing step S301, the primary routing device sends the ARP entry to the backup routing device. If the primary routing device learns the ARP entries of multiple users, the ARP entries of all the learned users can be sent to the alternate routing device.

When the primary routing device is faulty, the secondary routing device needs to perform the primary and secondary routing device switching. The switching process mainly includes: directing the upstream traffic to the standby routing device; On the backup routing device, when forwarding to the user, the backup routing device needs to know the address of the user and the like, because in step S302, the backup routing device has received and learned the ARP entry of the user, so the user can be directly used here. The ARP entry forwards the user's downstream traffic.

In the foregoing step S301, the preset rule may be: the primary routing device periodically sends the learned address resolution protocol entry of the user to the standby routing device; or the address resolution protocol of the learned user in the learned routing device. When the number of entries reaches the preset value, it is sent to the alternate routing device, where the preset value can be one or more.

Before the step S301, the method further includes: configuring an Inter-Chassis Backup Group (ICBG) between the primary routing device and the standby routing device.

In the foregoing step S301, the primary and secondary routing devices send the ARP entry to the standby routing device in multiple manners. This embodiment provides a preferred mode: the communication protocol used by the primary routing device between the primary and secondary routing devices. Bind the address resolution protocol entry of the user to the alternate routing device through the communication protocol. Further, the communication protocol may be an Inter-Chassis Communication Protocol (ICCP) or a Service Information Backup Protocol (SIBP).

Embodiment 4:

The embodiment provides a backup method between the primary and secondary routing devices, including: before the primary and secondary routing devices switch, the primary routing device sends the learned address resolution protocol entry to the secondary routing device according to a preset rule. For learning by the alternate routing device.

In this embodiment, the preset rule may be: the primary routing device periodically sends the learned address resolution protocol entry of the user to the standby routing device; or the address resolution protocol of the learned user in the learned routing device. When the number of entries reaches the preset value, it is sent to the alternate routing device, where the preset value can be one or more.

Before the primary routing device sends the learned address resolution protocol entry to the standby routing device according to the preset rule, the method further includes: configuring an ICBG (Inter-Chassis Backup Group) between the primary routing device and the standby routing device. Rack backup group).

There are several ways for the primary and secondary routing devices to send ARP entries to the alternate routing device. This embodiment provides a preferred mode: the primary routing device binds the user's address to the communication protocol used between the primary and secondary routing devices. The protocol table entry is parsed, and the address resolution protocol table is sent to the alternate routing device by using a communication protocol. Further, the communication protocol may be an Inter-Chassis Communication Protocol (ICCP) or a Service Information Backup Protocol (SIBP).

Embodiment 5:

This embodiment provides a backup method between the primary and secondary routing devices. Referring to FIG. 4, the method includes the following steps:

Step S401: Before the primary and secondary routing device switches, the standby routing device receives the address resolution protocol entry of the user sent by the primary routing device.

Step S402: The standby routing device learns an address resolution protocol entry.

In this embodiment, before the primary and secondary routing devices perform the handover, the forwarding task is performed by the primary routing device. When the primary routing device works normally, the uplink and downlink traffic of the user are forwarded by the primary routing device. When the primary routing device is faulty, the secondary routing device needs to perform the primary and secondary routing device switching. The switching process mainly includes: directing the upstream traffic to the standby routing device; On the backup routing device, the backup routing device needs to know the user's address and other information when forwarding to the user. In the backup method provided in this embodiment, the standby routing device has received and learned the user before the primary standby routing device switches. ARP entry, so you can directly use the user's ARP entry to forward the user's downstream traffic.

Example 6:

The present invention also provides a method for switching between primary and secondary routing devices. Referring to FIG. 5, the method includes the following steps:

Step S501: Before the primary and secondary routing device switches, the standby routing device receives the address resolution protocol entry of the user sent by the primary routing device.

Step S502: The standby routing device learns an address resolution protocol entry.

Step S503: The standby routing device forwards the downlink traffic of the user according to the address resolution protocol entry.

Example 7:

This embodiment provides a routing system. Referring to FIG. 6, the method includes: an active routing device 601 and at least one backup routing device 602. The primary routing device 601 is configured to follow a preset rule before the primary standby routing device switches. The address resolution protocol entry of the user learned by the primary routing device is sent to the alternate routing device; the secondary routing device 602 is configured to receive and learn the address resolution protocol entry.

In this embodiment, the primary routing device 601 is configured to periodically send the address resolution protocol entry of the user that it learns to the standby routing device; or the number of address resolution protocol entries of the user that it learns reaches The preset value is sent to the alternate routing device.

In this embodiment, the routing system further includes a processor 603. Referring to FIG. 7, the processor 603 is configured to send, to the backup routing device, the address resolution protocol entry of the user that the primary routing device learns according to the preset rule. Previously, configure a cross-rack backup group between the primary routing device and the alternate routing device.

In this embodiment, the primary routing device 601 is further configured to bind an address resolution protocol entry to the communication protocol used between the primary and secondary routing devices, and send the address resolution protocol table to the alternate routing device through the communication protocol.

In this embodiment, the backup routing device 602 is further configured to forward the downlink traffic of the user according to the address resolution protocol entry when the primary standby routing device switches.

Example 8:

The embodiment provides a primary routing device, including: a sending module, configured to send the learned address resolution protocol entry of the learned user to the standby routing device for backup after the primary standby routing device switches. Routing device learning. The sending module may periodically send the address resolution protocol entry of the user that it learns to the standby routing device, or send the address resolution protocol entry of the user to the alternate route when the number of the address resolution protocol entries of the user reaches a preset value. device. The sending module may also bind the address resolution protocol entry to the communication protocol used between the primary and secondary routing devices, and send the address resolution protocol table to the alternate routing device through the communication protocol.

Example 9:

The present invention further provides an alternate routing device. Referring to FIG. 8, the method includes: a receiving module 801 and a learning module 802. The receiving module 801 is configured to receive an address resolution of a user sent by the primary routing device before the primary standby routing device switches. The protocol table entry is set to learn the address resolution protocol entry.

In this embodiment, another alternate routing device is further provided. Referring to FIG. 9, the standby routing device includes a receiving module 901 and a learning module 902, and further includes a forwarding module 903, configured to resolve the protocol entries according to the address. Forward the downstream traffic of the user.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Industrial applicability

Based on the foregoing technical solution provided by the embodiment of the present invention, the primary routing device sends the learned address resolution protocol entry to the standby routing device before the primary routing device performs the primary and secondary routing device switching, so that the secondary routing device can advance the routing device. Learn the address resolution protocol entries of the user. When the primary and secondary routing devices switch, the secondary routing device learns the address resolution protocol entries of the user. Therefore, the downlink traffic of the user can be directly forwarded according to the address resolution protocol entry, thereby saving the learning address resolution protocol table. The time of the item speeds up the switching speed between the primary and secondary routing devices.

Claims

A backup method between primary and secondary routing devices, including:

Before the primary and secondary routing devices are switched, the primary routing device sends the learned address resolution protocol entry of the learned user to the standby routing device according to a preset rule.

The alternate routing device receives and learns the address resolution protocol entry.
The method for backing up between primary and secondary routing devices according to claim 1, wherein the preset rule is:

The primary routing device periodically sends the learned address resolution protocol entry of the learned user to the standby routing device;

Or the primary routing device sends the learned address resolution protocol entry to the alternate routing device when the number of the address resolution protocol entries reaches a preset value.
The method for backing up between the primary and secondary routing devices according to claim 1 or 2, wherein before the primary routing device sends the learned address resolution protocol entry of the learned user to the backup routing device according to the preset rule, the method further includes : Configure a cross-rack backup group between the primary routing device and the alternate routing device.
A method for switching between primary and secondary routing devices, including the steps in the method for backing up between primary and secondary routing devices according to any one of claims 1-3; and further comprising: when the primary and secondary routing devices switch, the alternate routing device Forwarding the downlink traffic of the user according to the address resolution protocol entry.
A backup method between primary and secondary routing devices, including:

Before the primary and secondary routing devices are switched, the primary routing device sends the learned address resolution protocol entries of the learned user to the standby routing device for learning by the standby routing device.
A backup method between primary and secondary routing devices, including:

Before the primary and secondary routing device switches, the standby routing device receives the address resolution protocol entry of the user sent by the primary routing device.

The standby routing device learns the address resolution protocol entry.
A method for switching between primary and secondary routing devices, comprising the steps in the backup method between primary and secondary routing devices according to claim 6;

The method further includes: the standby routing device forwarding the downlink traffic of the user according to the address resolution protocol entry.
A routing system includes: an active routing device and at least one standby routing device, where the primary routing device is configured to resolve the address of the user learned by the primary routing device according to a preset rule before the primary standby routing device switches. The protocol entry is sent to the alternate routing device.

The alternate routing device is configured to receive and learn the address resolution protocol entry.
The routing system according to claim 8, wherein said primary routing device is configured to periodically transmit the address resolution protocol entry of the user it learned to the alternate routing device; or the address of the user at which it learned When the number of resolution protocol entries reaches the preset value, it is sent to the alternate routing device.
The routing system according to claim 8 or 9, wherein the routing system further comprises a processor, configured to send, to the primary routing device, the address resolution protocol entry of the user that it learns according to a preset rule Before the alternate routing device, configure a cross-rack backup group between the primary routing device and the alternate routing device.
The routing system according to claim 8 or 9, wherein the backup routing device is further configured to forward the downlink traffic of the user according to the address resolution protocol entry when the primary standby routing device switches.
An active routing device includes: a sending module, configured to send the learned address resolution protocol entry of the learned user to the standby routing device according to a preset rule before the primary and secondary routing device switches, for the standby routing device to learn.
An alternate routing device includes: a receiving module and a learning module;

The receiving module is configured to receive an address resolution protocol entry of the user sent by the primary routing device before the primary standby routing device switches;

The learning module is configured to learn the address resolution protocol entry.
The backup routing device of claim 13, further comprising a forwarding module configured to forward the downlink traffic of the user according to the address resolution protocol entry.