l3dsr
Load BalancingWeb Servers & Reverse Proxies

l3dsr

Direct Server Return load balancing across Layer 3 boundaries.

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Direct Server Return (DSR) load balancing is a common way to distribute network traffic using an approach that currently requires the load balancer and all hosts behind the Virtual IP (VIP) to be within the same Layer 2 broadcast domain. This is a severe limitation that hinders scaling VIPs beyond a single contiguous subnet. To overcome this limitation, we present a method to perform DSR load balancing across Layer 3 boundaries (``L3DSR''), a solution that allows Yahoo! to serve up to ten times as many VIPs on a single hardware Load Balancer compared to other Layer 3 load balancing methods.

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