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SMs, ES2-S1 Service IOA, and Shared Tunnel-Server Modules

You can install multiple modules to provide redundancy. If you install multiple modules at the same time, the router automatically distributes the tunnel-service interfaces over the modules in proportion to the available tunnel-service interfaces.

Even distribution of tunnel-service interfaces is not critical to router performance. However, the number of modules that you install must be able to support the extra tunnel if one of the modules becomes unavailable.

Note: When both dedicated tunnel-server ports (on SMs) and shared tunnel-server ports (on shared tunnel-server modules) are configured on ERX-7xx models, ERX-14xx models, and the ERX-310 router, the router performs load balancing across all available server ports of the same type. For this purpose, dedicated tunnel-server ports (on SMs) and shared tunnel-server ports (on shared tunnel-server modules) are considered one type of server port, whereas server ports on ISMs are considered a different type.

Interface allocation depends on the types of tunnel-service interface created on the router. For more information about the types of tunnel-service interfaces, see Types of Tunnel-Service Interfaces .

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