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CHAPTER 9
Configuring IP Tunnels
Overview
GRE Tunnels
Copyright © 2010, Juniper Networks, Inc.
IP tunnels provide a way of transporting datagrams between routers separated by
networks that do not support all the protocols that those routers support. This chapter
describes how to configure IP tunnels on E Series routers; it contains the following sections:
Overview on page 237
Platform Considerations on page 238
References on page 239
Configuration Tasks on page 240
Monitoring IP Tunnels on page 244
E Series routers support static IP tunnels. An IP tunnel is a virtual point-to-point connection
between two routers. See Figure 19 on page 237. To establish an IP tunnel, you specify a
tunnel type and name, and then configure an interface on each router to act as an endpoint
for the tunnel.
Figure 19: IP Tunneling
T unne l
Sou rce
Data
E Series routers support the following types of IP tunnels:
Generic Routing Encapsulation (GRE) tunnels
Distance Vector Multicast Routing Protocol (DVMRP) tunnels, also known as IP-in-IP
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,
Destination
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