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Method and router for voting designated intermediate system

A technology for specifying intermediate systems and intermediate systems, applied in the field of methods and routers, and electing designated intermediate systems, can solve problems such as service interruption, broadcast network traffic impact, and reduce broadcast network reliability, so as to improve reliability and solve network shocks Effect

Active Publication Date: 2009-12-30
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, router A will think that it can only reach router B, but not router C and router D; other devices also have the same problem
From the perspective of the traffic model, Router A can reach Router C, but now because Router D is added, the services of Router A and Router C are interrupted, which reduces the reliability of the broadcast network.
If the DIS equipment in the broadcast network keeps vibrating and the DIS keeps switching, the traffic passing through the broadcast network will be seriously affected.

Method used

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  • Method and router for voting designated intermediate system
  • Method and router for voting designated intermediate system
  • Method and router for voting designated intermediate system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see image 3 , which is a flowchart of an embodiment of a method for electing a DIS in the present invention, the method includes the following steps:

[0023] Step 301: electing an IS from all ISs at the local level as the current designated IS at the level;

[0024] Wherein, the electing an IS from all the ISs at the local level as the current designated intermediate system DIS of the level includes: when the DIS priorities of all the ISs at the local level are different, comparing the DIS priorities of all the ISs DIS priority, elect the IS with a higher DIS priority as the current DIS; or, when the DIS priorities of all the ISs at the local level are the same, compare the MAC addresses of the ISs, and select the IS with a higher MAC address Election for the current DIS.

[0025] Step 302: broadcast an IIH (Intermediate System to Intermediate System Hello) message, when the IS is elected as the current DIS of the level, the IIH message contains the information used...

Embodiment 2

[0033] The specific implementation process of Embodiment 1 of the present invention will be described below in combination with specific application scenarios. read on figure 1 ,Such as figure 1 As shown, there are three routers A, B, and C in the broadcast network and they are at the same level. The priority and MAC address attributes are:

[0034] Router A: DIS Priority: 100 MAC: 00-E0-4C-77-7E-27

[0035] Router B: DIS Priority: 100 MAC: 00-E0-4C-77-7E-28

[0036] Router C: DIS Priority: 64 MAC: 00-E0-4C-77-7E-30

[0037] combine figure 1 For a network topology diagram, see Figure 4 , which is a flowchart of another embodiment of a method for electing a current DIS in the present invention, including the following steps:

[0038] Step 401: Router A, router B and router C respectively receive IIH messages sent by each other;

[0039] Wherein, the header of the IIH message contains a priority field, and the priority field indicates the DIS priority of the router corre...

Embodiment 3

[0057] see Figure 5 , which is a flow chart of another embodiment of a method for electing a DIS in the present invention. The difference between this embodiment and Embodiment 1 is that the value of the priority field in the IH message is set to the maximum value to notify itself is the current DIS. The method includes the following steps:

[0058] Step 501: electing an IS from all ISs at the local level as the current designated IS at the level;

[0059] Step 502: broadcast an IIH message, when the IS is elected as the current DIS of the level, the priority field value in the IIH message is set to the maximum value, and the maximum priority field is used to make the level The other ISs select the IS as the current DIS of the level.

[0060] As can be seen from the embodiments of the present invention, when a certain IS in the broadcast network is elected as the current DIS, it immediately notifies all ISs in the broadcast network that it has Become the current DIS, so a...

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Abstract

The embodiment of the invention discloses a method and a router for voting a designated intermediate system. The method comprises the following steps: voting an IS from all the intermediate systems IS in a local grade as a current designated intermediate system DIS of the grade; and broadcasting an IIH message. When the IS is voted as the current DIS of the grade, the IIH message contains DIS identification which is used for indicating self as the current DIS of the grade; and the DIS identification is used for allowing other IS of the grade to select the IS as the current DIS of the grade. The embodiment can improve the reliability of a broadcast network in a DIS switching process.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to a method and a router for electing a designated intermediate system. Background technique [0002] Today's data communication network is mainly carried by the IP (Internet protocol, Internet Protocol) protocol stack. In the IP network, the router, as the basic network element, assumes the role of transmitting IP packets. According to ISIS (Intermediate System to Intermediate System, system to intermediate system) routing protocol to determine the destination address and outgoing interface of the next hop. The ISIS routing protocol is a protocol based on the link state algorithm. When all routers in the network run the ISIS protocol, neighbor relationships will be established between adjacent routers, and each router will link the links between itself and adjacent routers. The information is flooded to the entire network. When each router in the network collects the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/28H04L45/16
Inventor 刘小刚王聪
Owner HUAWEI TECH CO LTD