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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.

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