Thanks to a system’s redundancy, the load from a failed system can be distributed without any glitches across the remaining hardware. When your leased cabinet or cage is connected to your UK colocation network, setting up a redundant network solution is possible. Although this process is simple it can cost you a lot. You can get tons of advantages from a cheaper alternative-setting up a redundant network with a colocation provider.
In fact, your access to websites can be improved drastically just by outsourcing your network traffic to a colo provider with a greater bandwidth capacity. Doing this can also reduce your traffic backhaul costs and free up your internal networks for other purposes. You can easily set up a redundant network with a colocation provider today, thanks to the large number of service providers which offer this service.
Basically, when you create a simple redundant network you just need to configure two VLANS in switches. One will serve as a gateway for local servers while the other will be connected to your router. You also need to configure a default route so that when one link goes down the traffic will be transferred to the other without delay. This will enable redundancy in your Internet links.
Network redundancy can be broken down into the internal network and the external network. Two drops from your server coloprovider, each from different routers, are used in order to make your external network redundant. Normally a drop is preconfigured which will enable you to set up communication between your firewalls and colo routers. Then ask your colocation to route a public IP space via BGP over each of the drops they have provided. BGP will render human commands unnecessary when a primary link is dropped and immediately picked up by the secondary drop. You can get your drops into your firewalls by plugging each individual drop into a different switch on your network and then splitting out two Ethernet cables. For instance drop one from the colocation plugs into SW01 and then splits to plug into each WAN1 on each firewall. Drop two from the colocation plugs into SW02 and splits out to plug into each WAN2 of each firewall. If you do not have the budget for four switches then you can create a VLAN on each switch with three ports in it to accomplish each goal.
The internal network redundancy is provided by plugging DMZ1 on FW01 into SW01 and DMZ1 on FW02 into SW02. It’s also important, if you want the two servers to travers the network out, to make sure that SW01 and SW02 are connected properly. LB01 and LB02 should be plugged into SW01 and SW02, respectively.
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