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Chapter 14 Load Balancing in the P333R-LB
Avaya P333R-LB User’s Guide 31
• Single Virtual Service for multiple VIPs - PIP enables mapping several VIPs to
a single application. The Virtual Services, configured for each VIP, point to the
same Real Server Group as well as to the same Real port. This enables emulating
a configuration where different servers, each with a different IP address,
provide the same service.
• Direct Client-Real Server session access - Full NAT enables sessions to the VIP
as well as direct sessions between the Clients and Real Servers to traverse the
same P333R-LB. The sessions to the VIP undergo Full NAT, while direct
Client-Real Server sessions are routed by the P333R-LB without NAT. Such an
application is not possible when implementing Half NAT.
• Mapping different Virtual Services to the same port on the Real Servers -
Each service has its own PIP, enabling different flows to the same port.
You prepare banks of IP address ranges and associate each Virtual Service with a
bank.
Note: You can create 64 banks of PIP addresses, with a total of 32,768 PIP addresses.
If you haven’t configured a bank for a Virtual Service, P333R-LB uses Half NAT
load balancing for that Virtual Service.
With Full NAT, responses made by the Real Server are forced to pass through the
P333R-LB, where the Real Server IP is replaced with the Virtual Server IP, and the
PIP with the client’s original IP before forwarding them to the clients.
Note: Configure the PIP addresses on a dedicated subnet. If you configure a local
interface on the PIP subnet, it is advertised throughout the network by the Routing
Protocols as belonging to that router, like all other subnets. If no Local Interface is
configured on the PIP subnet, Static Routes should be configured to reach that PIP
subnet.
Note: The P333R-LB does not answer to ARP requests, or to pings on the subnet.
Note: You can not configure Full NAT for Active FTP Virtual Services.