Barracuda Networks Load Balancer, Руководство администратора

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Load Balancing Concepts 25
DSR with Route-Path or Bridge-Path
The Barracuda Load Balancer supports deployment of multiple Services simultaneously, but all
Services must be configured as either Route-Path (recommended) or Bridge-Path. If Direct Server
Return is desired for at least one of the load-balanced Services, then it can be configured in conjuction
with the chosen deployment mode.
Direct Server Return in conjunction with Bridge-Path is not recommended . Please contact
Technical Support if you feel that your corporate network requires this configuration.
DSR is an option which is turned on for each Real Server. You may have DSR servers and non-DSR
servers running the same Service. Real Servers that are in DSR mode must be on the same subnet as
the WAN. If the Barracuda Load Balancer is in Route-Path mode, then the Real Servers that are not
in DSR mode must be on the same subnet as the LAN.
Figure 2.7: Direct Server Return in combination with Route-Path
Deploying Direct Server Return
Direct Server Return uses a flat network topology at the Layer 2 (Switching) and Layer 3 (IP) levels,
which means that the Barracuda Load Balancer, all VIPs, and all Real Servers all must be within the
same IP network and connected on the same switch.
Figure 2.6 above shows this topology. Each Real
Server must be one hop away from the Barracuda Load Balancer, but they use the WAN port. This
means their switch must be directly connected into the WAN port of the Load Balancer, or connected