Configuring Gre - HP MSR SERIES Configuration Manual

Configuring GRE

You can configure GRE over IPv4 tunnels through the Web interface.
Overview
Generic Routing Encapsulation (GRE) is a protocol designed for encapsulating and carrying the packets
of one network layer protocol (for example, IP or IPX) over another network layer protocol (for example,
IP). GRE is a tunneling technology and serves as a Layer 3 tunneling protocol.
A GRE tunnel is a virtual point-to-point connection for transferring encapsulated packets. Packets are
encapsulated at one end of the tunnel and de-encapsulated at the other end.
encapsulation and de-encapsulation processes.
Figure 375 X protocol networks interconnected through the GRE tunnel
For more information about GRE, see Layer 3—IP Services Configuration Guide in HP MSR Router Series
Configuration Guides (V5).
Configuring a GRE over IPv4 tunnel
Before you configure a GRE over IPv4 tunnel, configure an IP address for the interface (such as a VLAN
interface, an Ethernet interface, or a Loopback interface) to be used as the source interface of the tunnel
interface.
Recommended configuration procedure
Task
1. Creating a GRE
2. Configure a route through
the tunnel.
Creating a GRE tunnel
1. Select VPN > GRE from the navigation tree to enter the GRE tunnel configuration page, as shown
in Figure
Remarks
Required.
tunnel.
Create a tunnel interface and configure GRE tunnel related parameters.
Optional.
Each end of the tunnel must have a route (static or dynamic) through the
tunnel to the other end, so that GRE encapsulated packets can be forwarded
correctly.
For more information about route configuration, see "Configuring routes."
376.
375
Figure 375 depicts the