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# Platform Considerations

For information about modules that support IP reassembly on the ERX-7xx models, ERX-14xx models, and the ERX-310 router:

- See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.
- See ERX Module Guide, Appendix A, Module Protocol Support for information about the modules that support IP reassembly.

For information about modules that support IP reassembly on the E120 router or the E320 router:

- See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed module specifications.
- See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information about the modules that support IP reassembly.

## Module Requirements

The types of modules that support IP reassembly for tunnel packets depend on the type of E-series router that you have.

### ERX-7xx Models, ERX-14xx Models, and the ERX-310 Router

To configure IP reassembly on ERX-7xx models, ERX-14xx models, and the ERX-310 router, you must install one of a Service Module (SM), an IPSec Service line module (ISM), or a module that supports the use of shared tunnel-server ports. With these modules, an ERX router can perform reassembly of IP packets that it receives on DVMRP, GRE, IPSec, and L2TP tunnels.

Because IP reassembly is required only on tunnel egress packets, the router performs reassembly only on packets in which the IP destination address is local to the router and in which the underlying protocol is one of the supported tunneling protocols.

SMs provide dedicated tunnel-server ports that are always configured on the module. Unlike other line modules, SMs, and ISMs do not pair with corresponding I/O modules that contain ingress and egress ports. Instead, they receive data from and transmit data to other line modules with access to ingress and egress ports on their own associated I/O modules.

You can also create tunnels on router modules that support shared tunnel-server ports. You can configure (provision) a shared tunnel-server port to use a portion of the module's bandwidth to provide tunnel services. For a list of the modules that support shared tunnel-server ports, see the ERX Module Guide.

For information about configuring tunnel services on dedicated and shared tunnel-server ports, see Managing Tunnel Service and IPSec Service Interfaces in JUNOSe Physical Layer Configuration Guide.

### E120 Router and E320 Router

To configure IP reassembly on an E120 router or an E320 router, you must install an ES2 4G line module (LM) with an ES2-S1 Service I/O adapter (IOA), or an IOA that supports the use of shared tunnel-server ports. For information about installing modules in these routers, see the E120 and 320 Hardware Guide.

The ES2 4G LM and ES2-S1 Service IOA combination provides a dedicated tunnel-server port that are always configured on the IOA. Unlike SMs, the ES2 4G LM requires the ES2-S1 Service IOA to condition it to receive and transmit data to other line modules. The ES2-S1 Service IOA also does not have ingress or egress ports.

You can also configure IP reassembly on IOAs that support shared tunnel-server ports. You can configure (provision) a shared tunnel-server port to use a portion of the IOA's bandwidth to provide tunnel services. For a list of the IOAs that support shared tunnel-server ports, see the E120 and 320 Module Guide.

For information about configuring tunnel services on dedicated and shared tunnel-server ports, see Managing Tunnel Service and IPSec Service Interfaces in JUNOSe Physical Layer Configuration Guide.

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