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CHAPTER 10
Configuring Dynamic IP Tunnels
Dynamic IP Tunnel Overview
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 dynamic IP tunnels on E Series routers; it contains the following
sections:
Dynamic IP Tunnel Overview on page 251
Platform Considerations on page 253
References on page 255
Configuring a Destination Profile for Dynamic IP Tunnels on page 255
Monitoring Dynamic IP Tunnels on page 259
E Series routers support the following types of dynamic IP tunnels:
Generic Routing Encapsulation (GRE) tunnels
Distance Vector Multicast Routing Protocol (DVMRP) tunnels, also known as IP-in-IP
tunnels
To establish a dynamic IP tunnel for GRE or DVMRP interfaces, you must configure a
destination profile for a specific transport virtual router that is used to store tunnel
configuration options, including the source and destination addresses of the dynamic IP
tunnel.
A client application triggers the creation of dynamic IP tunnels based on the information
stored in the GRE or DVMRP destination profile. The application specifies a tunnel source,
tunnel destination, transport virtual router, and tunnel mode (GRE or DVMRP). If these
parameters match those configured in the destination profile, the system creates the
dynamic IP tunnel.
The application can automatically create an upper layer IPv4 interface over the GRE or
DVMRP interface by using the IP characteristics defined in a profile referenced in the GRE
or DVMRP destination profile.
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