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Route Advertisement Method and System

A technology for routing and notifying information, which is applied in the field of communication and can solve problems such as unreachable base station services, routing black holes, and packet discarding.

Active Publication Date: 2018-10-23
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When link 1 and link 2 fail at the same time, the uplink is switched to the standby PW, and the switchover is normal (service traffic along figure 1 The middle dotted line goes up to the BSC); the downlink traffic is shared to the two gateway devices based on the flow load, and the traffic arriving at the main gateway (such as figure 1 (shown by the solid line from BSC to the main gateway) When only link 1 fails, it can be switched to link 2 and forwarded by the backup gateway, but link 2 fails at the same time, so the message is discarded, and some base station services are unreachable , resulting in a routing black hole

Method used

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  • Route Advertisement Method and System
  • Route Advertisement Method and System
  • Route Advertisement Method and System

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0118] When the BSC provides the downlink data flow to the target access device (192.168.1.1 / 32), the current routing table is shown in Table 2, which indicates that the current path is only:

[0119] BSC→CE2→backup gateway→target access device

[0120] Therefore, the BSC sends the downlink data flow to the target access device through the CE (Customer Edge, user edge) 2 and the backup gateway. The corresponding diagram is as Figure 7 shown.

example 2

[0122] When the BSC provides the downlink data flow to the target access device (192.168.1.1 / 32), the current routing table is shown in Table 1, which indicates that the target access device can be reached through both the main gateway and the standby gateway. The BSC can provide downlink data streams to the main gateway and the standby gateway respectively. At this time, the main gateway needs to determine whether the target access device is directly accessible by the main gateway itself, or accessed through the standby gateway. In this embodiment, the main gateway itself can directly access the target access device, so the current path can be:

[0123] BSC→CE1→main gateway→target access device

[0124] BSC→CE2→backup gateway→target access device

[0125] The corresponding diagram is as Figure 8 shown.

example 3

[0127] In Example 2, if the main gateway judges that the target access device cannot be directly accessed by the main gateway itself, it needs to be accessed through the standby gateway. Therefore, in this embodiment, the main gateway needs to access the target access device through the backup gateway, so the current path can be:

[0128] BSC→CE1→main gateway→backup gateway→target access device

[0129] BSC→CE2→backup gateway→target access device

[0130] The corresponding diagram is as Figure 9 shown.

[0131] By implementing the present invention, the following beneficial effects can be obtained:

[0132] 1. The gateway device has realized the perception of the survival status of the access device on the same network segment;

[0133] 2. Realized the announcement of the detailed route of the access device between the gateway device and the access device without running the routing protocol, and realized a novel route notification scheme;

[0134] 3. Solved the routing ...

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Abstract

The invention discloses a method and system for route advertisement. A main gateway and a standby gateway sense the state of an access device at a preset time interval, respectivele, and provide first advertisement information and second advertisement information for BSC, wherein the first advertisement information includes a network segment route of the main gateway and an access device address, sensed by the main gateway, in a survival state, and the second advertisement information includes a network segment route of the standby gateway, and an access device address, sensed by the standby gateway, in a survival state. The BSC updates a preset routing table according to advertisement information, extracts the address of a target access device in the present routing table when sending downstream data, and searches user edge device identification relative to the address of the target access device. The BSC distributes the downstream data to a gateway device relative to the user edge device identification, so that the downstream data can be sent to the target access device via the gateway device. Therefore, the problem of routing black hole is solved.

Description

technical field [0001] The invention relates to the communication field, in particular to a route notification method and system. Background technique [0002] With the rapid development of 3G and LTE (Long Term Evolution, Long Term Evolution) services, China Telecom's integrated access network (IP (Internet Protocol, Internet Protocol) RAN (Radio Access Network, Radio Access Network, Radio Access Network)) pilot projects have been further expanded. In order to save the service IP address of the base station, the N:1 convergence mode of the PW (Pseudo Wire) gateway is deployed as a benchmark model. [0003] In the PW gateway N:1 convergence mode, the PW gateway (IP RAN B device) only advertises the gateway route upwards, and does not notify the base station of the detailed route. As a result, when multiple SRLGs (Shared Risk Link Group, Shared Risk Link Group) fail at the same time, some There is a routing black hole problem in the base station routing, which leads to the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/04
CPCH04W40/04
Inventor 孙嘉琪杨广铭卢泉兰潮黄卓君梁筱斌袁世章魏雄
Owner CHINA TELECOM CORP LTD