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Chapter 10
Configuring Dynamic IP Tunnels
Dynamic IP Tunnel Overview
Data MDT for Multicast VPNs and Dynamic IP Tunnels
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 261
Platform Considerations on page 263
References on page 265
Configuring a Destination Profile for Dynamic IP Tunnels on page 265
Monitoring Dynamic IP Tunnels on page 270
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.
The data multicast distribution tree (MDT) application for multicast VPNs can create
dynamic point-to-multipoint GRE tunnels.
Dynamic IP Tunnel Overview
261
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