GRE Tunnels
GRE encapsulates IP packets to enable data transmission through an IP tunnel. The
resulting encapsulated packet contains a GRE header and a delivery header.
Consequently, the packet requires more processing than an IP packet, and GRE can
be slower than native routing protocols.
GRE tunnels can be secured with IPSec. See “Securing L2TP and IP Tunnels with
IPSec” on page 287.
DVMRP Tunnels
DVMRP tunnels allow the exchange of IP multicast traffic between routers separated
by networks that do not support multicast routing. For information about DVMRP,
see
Configuring IPv4 Multicast
in
JUNOSe Multicast Routing Configuration Guide
.
DVMRP tunnels can be secured with IPSec. See “Securing L2TP and IP Tunnels with
IPSec” on page 287.
Platform Considerations
For information about modules that support IP tunnels 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 tunnels.
For information about modules that support IP tunnels on the E120 and E320
Broadband Services Routers:
■
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 tunnels.
Module Requirements
The supported modules for creating IP tunnels depends on the type of E Series router
that you have.
ERX7xx Models, ERX14xx Models, and the ERX310 Router
To create IP tunnels on an ERX7xx model, ERX14xx model, or an ERX310 router,
you must install a Service line module (SM) or a module that supports the use of
shared tunnel-server ports. For information about installing modules in the ERX
routers, see the
ERX Hardware Guide
.
246
■
Platform Considerations
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