Configuring Tunnel Interfaces

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SRC-PE Release 1.0.x Getting Started Guide > Configuring Remote Access to a C-series Platform > Configuring Tunnel Interfaces
Configuring Tunnel Interfaces

A tunnel allows direct connection between a remote location and an application running on the C-series platform; a tunnel lets you use the redirect server in deployments where the JUNOSe router does not have a direct connection to the C-series platform.

The C-series platform supports two types of tunnel interfaces:

GRE—Encapsulates traffic that can use various network protocols within IP. For C-series platforms, the tunnel interface encapsulates IP packets.

IP-over-IP—Encapsulates IP packets within IP packets.

The other endpoint for the tunnel on a JUNOS or JUNOSE router must be configured for the tunnel to be operational.

Use the following configuration statements to configure tunnel interfaces at the [edit] hierarchy level:
interfaces name unit unit-number tunnel {
    mode (ipip | gre);
    destination destination; 
    source source; 
    key key; 
    interface interface; 
    ttl ttl;
}
interfaces name unit unit-number family inet {
    address address; 
}
To configure a tunnel interface on a C-series platform:
From configuration mode, access the configuration statement that configures tunnel interfaces.
[edit]
user@host# edit interfaces name unit unit-number tunnel
For example:
[edit]
user@host# edit interfaces ip-tunnel unit t0 tunnel
Configure the type of tunnel, IP-over-IP or GRE.
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set mode ipip
or
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set mode gre
Specify the IP address of the remote end of the tunnel.
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set destination destination
For example:
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set destination 192.0.2.20
(Optional) Specify an IP address that will not change to receive tunneled packets.
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set source source
For example:
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set source 192.20.10.5
If you specify a source address, Step 6 is required.
(Optional) For a GRE tunnel, specify a key.
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set key key
For example:
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set key 250
(Optional. Required if you specify a source address.) Specify an existing physical interface on the C-series platform.
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set interface interface
For example:
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set interface eth0
(Optional) Specify the lifetime of tunneled packets.
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set ttl ttl
For example:
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# set ttl 110
Configure an IP address for the tunnel interface. This IP address is used to connect to a device at the other end of the tunnel. For example:
[edit interfaces ip-tunnel unit t0 tunnel]
user@host# up 
[edit interfaces ip-tunnel unit t0]
user@host# edit family inet 
[edit interfaces ip-tunnel unit t0 family inet]
user@host# set address 10.0.1.1/24
Verify the configuration by running the show command. For example:
[edit interfaces]
user@host# show 
ip-tunnel {
  unit t0 {
    family { 
      inet { 
        address 10.0.1.1/24;
      }
    }
    tunnel { 
      mode ipip;
      destination 192.0.2.20;
      source 192.20.10.5;
      interface eth0;
      ttl 110;
    }
  }
}

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