We manage a few different types of hardware load balancers inside the DC. Our primary choice for a vendor is F5. We have a few sets of the Big IP 1500 and a pair of LTM6400. The LTM's are used both as a load balancer and application firewall. We have deployed the Citrix Netscalars with great success for many customers. The Cisco CSS devices were hated by the Network Engineers but have seemed to hold up over the years.
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