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Network address reconstruction method in IPv6 switch-in network

A network address and network access technology, applied in the field of communication, can solve problems such as terminal equipment not working properly and DAD detection not being carried out smoothly

Active Publication Date: 2009-06-10
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many kinds of memory: ROM (read-only memory), Flash (flash memory), RAM (random access memory), etc. Considering the price, function and access speed, network devices usually use RAM to store data information such as routing tables. The access device uses RAM to save the address-line port mapping table. When the access device is powered off or restarted due to other faults, the address-line port mapping table does not exist, which will make future DAD detection difficult. The terminal device under the network access device will not work normally

Method used

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  • Network address reconstruction method in IPv6 switch-in network
  • Network address reconstruction method in IPv6 switch-in network
  • Network address reconstruction method in IPv6 switch-in network

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Embodiment 1

[0025] Embodiment 1: Reenable-Prefix

[0026] This embodiment relates to RFC2461 "IPv6 Neighbor Discovery" and RFC2462 "IPv6 Stateless Address Automatic Configuration". The network access device initiates a prefix re-enabling request to the routing device, and the routing device prohibits the prefix used by the terminal devices in the user network, and then makes the prefix a legal prefix again, prompting each normally powered-on terminal device in the user network to restart An IPv6 network address is constructed; further, the terminal device initiates a DAD detection, and the network access device can successfully reconstruct the address-line port mapping table according to the DAD detection message.

[0027] image 3 It is the format of the prefix information field of the RA message in IPv6 stateless address configuration. Among them, the Type (type) option is 3: uniquely identifies the message type; Prefix (prefix) option: as mentioned above, in the stateless address con...

Embodiment 2

[0037] Embodiment 2: Multicast Listener Discovery (MLD: Multicast Listener Discovery);

[0038] This solution involves RFC2710 "IPv6 Multicast Listener Discovery" and RFC3810 "Multicast Listener Discovery (Second Edition)". This embodiment utilizes the multicast query and multicast report in the multicast listener discovery protocol, and according to the The IP source address reconstructs the address-line-port mapping table.

[0039] The IPv4 network uses the IGMP (Internet Group Management Protocol) protocol to manage the local subnet multicast membership. In the IPv6 network, the MLD protocol replaces the IGMP protocol. There are currently two versions of MLD, namely the first version of MLD and the second version of MLD , according to its relevant regulations: IPv6 routers use the MLD protocol to discover multicast members on links directly connected to them. The MLD protocol runs on the ICMP (Internet Control Message Protocol) protocol, which defines three types of messag...

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Abstract

A method for reconstructing the network address in the IPv6 access network includes: a) the network access equipment sends the reenable-prefix request to the route equipment; b) the route equipment forbids the network prefix which is used currently by the terminal equipment in the user network connecting with the network access equipment; c) the route equipment reassigns the network prefix to the user network connecting with the network access equipment; d) the terminal equipment in the user network reconstructs the network address according to the obtained network prefix. In the prefix shared IPv6 access network, the network access equipment could further reconstruct the address and circuit port map table, therefore, it is avoided that the normal operation of the access network is affected because of the address and circuit port map table is lost when the network access equipment is restarted for some reason or some other fault appears.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a network address reconstruction method in an IPv6 access network. Background technique [0002] With the rapid development of communication network technology and the maturity of IPv6, IPv4 access will be replaced by IPv6 access network. [0003] Such as figure 1 In a typical IPv6 access network model shown, the network access device DSLAM 12 (digital subscriber line access multiplexer) and the CPE (customer equipment) in the user network 11A, 11B usually work on the second layer, BRAS 13 (broadband access server) works on the third layer. When IPv6 is introduced into this access network model, address allocation can be done by the BRAS to the user network, and there are multiple address configuration methods: (1) A user network has a 64-bit prefix, that is, exclusive 64 bit address space. Since the devices in a user network are much smaller than 2 64 One, the address...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/12H04L29/06
CPCH04L29/12028H04L69/40H04L29/1232H04L61/2092H04L29/14H04L61/103H04L29/12009H04L61/2046H04L29/12264H04L61/5046H04L61/00H04L61/5092
Inventor 温海波江滢澜张青山丁哲民
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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