Network Router User Manual

Appendix A: New Features Supported on Line Cards
364 SmartSwitch Router User Reference Manual
When multiple routers are connected together, only the router using Network Address
Translation requires the -AA or T-series line card. In Diagram 2, only Router W requires
the -AA or T-series line card since it is the only router performing translation to the global
Internet. Note that Routers A and B are connected to the -AA or T-series line card on
Router W.
Load Balancing (LSNAT)
Load balancing distributes clients’ requests to a predefined group of servers with no
changes required on the clients or servers. To distribute requests to multiple servers, a
server group must first be created with a virtual server address. Servers can then be added
to this server group to handle clients’ requests through the virtual server address. The SSR
forwards requests to servers inside the servers group according to a load-sharing
algorithm. The SSR currently supports three types of load-sharing algorithms: round-
robin, weighted-round-robin, and least-loaded.