| By :
Dirik Hameed
A system can distribute the load from a failed system across the remaining hardware without any glitches or overload thanks to its redundancy. It's a common question on how to set up a redundant network solution, especially when your leased cage or cabinet is connected to your co-location network. These can be easily achieved but usually the options in achieving this task are expensive. However, you can avail great benefits from setting up a redundant network with a colocation provider. You can improve the speeds by which you access your website or your websites are accessed by outsourcing network traffic to a colo provider that has a larger bandwidth capacity. This can benefit you in many ways: not only can you free up your internal networks for other purposes, you can also significantly reduce your traffic backhaul costs. Lots of service providers nowadays give you solutions to set up a redundanct network with a colocation provider. 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 colo provider, each from different routers, are used in order to make your external network redundant. Typically each drop has its own or 30 configured on it so you can set up communication between your firewalls and the colocation routers or firewalls. Your colocation can then route a public IP space through BGP over each drop. BGP will allow your primary link to drop and be picked up by the secondary drop with minimal downtime without any human interaction. By plugging each drop into a different switch on your network and splitting two Ethernet cables from each switch, you can plug the drops into your firewalls. For example, a drop from one colocation plug is then split into each firewall. Likewise, drop two goes through the same process on a different route. You can make do with a three port VLAN if you can't afford four switches. The internal network redundancy is provided by plugging DMZ1 on FW01 into SW01 and DMZ1 on FW02 into SW02. SW01 and SW02 should be connected together as well to allow the servers in server farm one and server farm two to traverse the network out either firewall if necessary. That being said, it's also important to make sure that LB01 is plugged in SW01 and LB02 in SW02.
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