I have 2 sites that contain 2 web servers each (All 4 servers have the same content). When both site are up I would like all traffic to be load balanced between the 4 servers. I also have a requirement that is any server or site goes down, sevice is not affected.
I have an CSS11501 with enhanced feature set at each site.
An application session is configured between two CSS switches in two different geographic locations. There is no requirement for a point-to-point link joining the sites; the only requirement is that the two sites can route to each other.
Using the CSS switches DNS capability, a higher level DNS server (in this example, the one authoritative for yourdomain.com) will be configured to use both CSS' circuit VLAN address as NS records for a sub-domain called www.yourdomain.com. Whichever CSS is referred to by the higher level DNS server will then resolve that a record request with the IP address of the DNS content rule on the CSS.
The primary site will be preferred through a combination of using an ACL on the secondary CSS, an application session between the two CSS switches, and configuring the above mentioned NS records on the higher-level DNS server.
The unmanaged mode is also known as Network only switching, which is introduced in Brazos release. It adds the flexibility for customer to use only network automation for service appliance.
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