Platform Considerations; Module Requirements; Erx7Xx Models, Erx14Xx Models, And The Erx310 Router; Figure 21: Tunneling Through An Ip Network That Fragments Packets - Juniper JUNOSE 11.2.X IP SERVICES Configuration Manual

JunosE 11.2.x IP Services Configuration Guide

Platform Considerations

Module Requirements

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Figure 21: Tunneling Through an IP Network That Fragments Packets

For information about modules that support IP reassembly on the ERX7xx models,
ERX14xx models, and the ERX310 Broadband Services 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 or E320 Broadband
Services 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.
The types of modules that support IP reassembly for tunnel packets depend on the type
of E Series router that you have.

ERX7xx Models, ERX14xx Models, and the ERX310 Router

To configure IP reassembly on ERX7xx models, ERX14xx models, and the ERX310 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.
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