Network redundancy is very common, usually in the computer room. The network redundancy mentioned in this article is in the office area. It is different from the redundant equipment used in the computer room. The solution described here is to have no redundant equipment and only rely on a redundant network composed of separate routers and switches. It is recommended to reduce the Friends of network costs can refer to it.
The solution in this article is to manually drift the network by configuring static routing to achieve low-cost network redundancy, which not only saves money, but also ensures the smooth flow of the network. I guess the boss likes it.
Table of contents
Scheme topology
As shown in the figure below, this is the most basic dual-broadband network. For simplicity, devices such as the access layer and AC are not shown in the figure.
Usually, telecommunications broadband is mainly used for wired networks and belongs to the intranet environment. Mobile broadband is mainly used in wireless networks. For security, the two networks are isolated. This brings up a problem. Once there is a problem with telecommunications or mobile broadband, one of the wired and wireless networks will be interrupted. How can we ensure that the network is not interrupted?
Program implementation
In the above topology, when the telecommunications broadband fails, you only need to log in to the sysview interface of the core switch and execute the following command, then the network request will drift to the mobile broadband, and the route can be adjusted according to your own network environment .
undo ip route-static 0.0.0.0 0.0.0.0 192.168.200.1In the same way, when the telecom network is restored, it is enough to reconfigure the routing just now on the core switch.
ip route-static 0.0.0.0 0.0.0.0 192.168.200.1If it is a mobile broadband failure, it is even simpler. You only need to unplug the cable from the mobile broadband router to the core switch without any operation.
Precautions
So what to do when the above two broadband are disconnected? In fact, there are solutions now, but one more broadband is needed. Considering that in most cases, the probability of failure of both operators is extremely low, the third solution will not be written in detail here.
Another point, considering that DNS needs to be configured on the client computer, it is best to configure DNS that can be accessed by both Telecom and Mobile, otherwise specifying a DNS of a certain company will cause some websites to fail to open after switching