Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 277

Configure a physical or loopback interface for the end of the tunnel on virtual
2.
router boston.
The IP address of this interface appears in the header of tunneled frames and is
used for forwarding traffic.
host1:boston#interface atm 12/0.5
host1:boston(config-if)#ip address 10.5.5.5 255.255.255.0
Configure the tunnel interface on virtual router boston.
3.
a. Create the tunnel interface.
host1:boston(config)#interface tunnel gre:ChicagoTunnel
b. Configure the source and destination points of the tunnel interface.
host1:boston(config-if)#tunnel source 10.5.5.5
host1:boston(config-if)#tunnel destination 10.6.6.6
c. Set the MTU for the tunnel.
host1:boston(config-if)#tunnel mtu 8000
d. Configure the IP address of the tunnel interface.
host1:boston(config-if)#ip address 10.7.7.7 255.255.255.0
Configure a virtual router called chicago that supports the other end of the tunnel.
4.
host1(config)#virtual-router chicago
Configure a physical or loopback interface for the end of the tunnel on virtual
5.
router chicago.
host1:chicago(config)#interface atm 12/1.5
host1:chicago(config-if)#ip address 10.6.6.6 255.255.255.0
Configure the tunnel interface on virtual router chicago.
6.
a. Create the tunnel interface.
The name of the tunnel interface can differ from the tunnel interface
configured in Step 3.
host1:chicago(config-if)#interface tunnel gre:BostonTunnel
b. Configure the source and destination points of the tunnel interface.
The destination of this tunnel interface matches the source of the tunnel
interface configured in Step 3 and vice versa.
host1:chicago(config-if)#tunnel source 10.6.6.6
host1:chicago(config-if)#tunnel destination 10.5.5.5
c. Set the MTU for the tunnel.
The MTU must match the MTU configured in Step 3.
Chapter 9: Configuring IP Tunnels
251
Configuration Tasks