| Nowadays the security and reliability of network service are becoming more and more important. Therefore if any problems about network gateway equipment happened, the network can hardly provide normal service. In this thesis, Author successfully utilizes one of trunk Technique—Virtual Router Redundancy Protocol, which is short for VRRP to achieve the high Availability of network gateway. In this case, when one network gateway equipment delays work, the backup one will take over network gateway service on time. The disruption of business operations will not be caused. Surely, the quality of network services will be improved.VRRP is equipped with the advantage of simple configuration and fast disposition relative to other Redundancy Protection Protocol. It can well adapt to IP network topology. In Contrast with static-route' s Redundancy Protection, VRRP can automatically examine the state of uplinks, avoiding route forwarding faults which resulting the failure of uplinks. It is much easier and faster than the IGP and other complicated protective mechanism at the data-link-layer, with the ability of loading blance by contrast with .In this thesis, author firstly introduced basic techniques of High Availability ,Discussing commonly way of redundancy protection techniques at data-link-layer and network-layer, analyzing their deficiency respectively. Then author elaborated on the operational principle of VRRP, including concepts definition, parameter choice, Protocol mechanism , the elective policies of master gateway ,and the implementation of master gateway. After researching the possible problems of security and reliability curing during the synchronous procedures of VRRP, author gives some suggestion for optimizing the Protocol.At last, author elaborated on The implementation of processes by VRRP in Practice, with a project instance that An Shan Telecom serve with a private network. from the point of engineering economy , simply analyzing the value of this means. |
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