User's Manual

Configuring GRE, NAT, RIPSO, and BFE Services
1-8
308625-14.00 Rev 00
Creating a GRE Tunnel
You can create up to 64 GRE tunnels on one router; each GRE tunnel can have
multiple end points. You can configure up to 256 remote tunnel end points
distributed over the configured GRE tunnels.
To create a tunnel, you must:
1.
Create the local tunnel end point.
2.
Add one or more protocols to the local tunnel end point.
3.
Configure the remote tunnel end point.
These steps are described in the following sections.
Creating the Local Tunnel End Point
When you create a GRE tunnel, you assign the tunnel a name and an IP address.
The IP address is the router interface used as the local physical end point for this
tunnel. The IP address must be that of an existing physical router IP interface.
This address is visible to the network cloud that the tunnel passes through.
To maximize the robustness of the tunnel, use a circuitless IP address as a tunnel’s
physical end point whenever possible. (For instructions on configuring a
circuitless IP interface, see Configuring IP, ARP, RARP, RIP, and OSPF Services.)
Using the BCC
To create a GRE tunnel:
1.
Navigate to the box or stack prompt and enter the following command:
tunnels
The tunnels prompt appears.
2.
Navigate to the tunnels prompt (for example,
box; tunnels
) and enter the
following command:
gre name
<name>
local-address
<address>
name
is a unique name for this tunnel.
address is a valid IP address of a local router interface expressed in
dotted-decimal notation.