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A method, device and router to realize DHCP lease smoothing switching in VRRP backup group

A technology of smooth switching and DHCP messages, which is applied to realize the smooth switching of DHCP leases in VRRP backup groups. In the field of routers, it can solve problems such as the difficulty of synchronously switching routers for DHCP leases, the inability of DHCPClient to communicate with the outside world, and the non-continuity of DHCP leases. To achieve the effect of ensuring continuity

Active Publication Date: 2010-12-22
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that when a router acts as a VRRP Master and a DHCP Server at the same time, if a fault occurs, its VRRP function can be quickly switched to other Backup routers, but the DHCP lease recorded by it cannot be switched to the corresponding router synchronously.
If the new router still needs to filter the communication according to the DHCP lease (such as address and MAC), all the DHCPClients after the switch cannot communicate with the outside world, that is, because the DHCP lease is not continuous during the VRRP switch, the new Master cannot Continue to provide DHCP service

Method used

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  • A method, device and router to realize DHCP lease smoothing switching in VRRP backup group
  • A method, device and router to realize DHCP lease smoothing switching in VRRP backup group
  • A method, device and router to realize DHCP lease smoothing switching in VRRP backup group

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Embodiment Construction

[0031] Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are for illustration only, and are not intended to limit the present invention.

[0032] First of all, it should be noted that VRRP and DHCP are two systems that do not interfere with each other. The Master router in the VRRP backup group may serve as the DHCP Server in the Client / Server mode or the DHCP Relay in the Client / Relay / Server mode. The connected client provides DHCP service; the technical solution provided by the present invention is applicable to the above two situations at the same time.

[0033] The general idea of ​​the present invention includes configuring the same DHCP service on each router in the VRRP backup group and synchronizing the DHCP lease, so that when a VRRP switch occurs, the lease of each router is synchronized, so the new Master router can continue Provide DHCP services, such as implementing authenticati...

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PUM

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Abstract

The invention discloses a method and a device for realizing the smoothing switch of a DHCP lease in a VRRP backup group, which is applied to the VRRP backup group comprising a Master router and at least one Backup router. The method includes the following steps: the Master router locally maintains a first DHCP lease through responding to a DHCP message sent by the connected clients and synchronizes the change of the first DHCP lease to the Backup router through a predetermined DHCP response message; the Backup router locally maintains a second DHCP lease according to the monitored DHCP response message sent by the Master router and continuously provides the clients with DHCP service through the second DHCP lease when the Backup router is switched to the Master router. The invention also discloses a router, which guarantees the continuity of the DHCP information before or after the switching of the Master router in the VRRP backup group.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a device for realizing smooth switching of DHCP leases in a VRRP backup group, and also to a router. Background technique [0002] VRRP (Virtual Router Redundancy Protocol, Virtual Router Redundancy Protocol) provides a virtual router configuration method: a group of routers in the LAN is divided into a backup group, one of which is elected as the Master, and other routers as Backup, the function of this backup group is equivalent to a virtual router. figure 1 It is a diagram of a VRRP backup group: routers A, B, and C negotiate to elect a Master router (assumed to be A), and B and C act as Backup routers. For file forwarding, Backup routers B and C are responsible for monitoring whether A is working normally; when router A fails, a new Master router is elected between B and C as a gateway to continue to be responsible for message forwarding. [0003] DHCP (Dynamic Host C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/06H04L45/28
Inventor 黄哲
Owner NEW H3C TECH CO LTD