Configuring Dynamic Subscriber Interfaces over GRE Tunnels

To configure a dynamic subscriber interface in an GRE tunnel configuration by using packet detection, perform the following steps:

1. Create a GRE tunnel interface.

   For instructions, see the Configuration Tasks section in JUNOSe IP Services Configuration Guide .

2. Create the primary IP interface by assigning an IP address and mask to the bridged Ethernet interface (or make it unnumbered).

   host1(config-subif)#ip address 192.168.2.20 255.255.255.0

3. Configure the packet detect feature and specify that IP automatically detect packets that do not match any entries in the demultiplexer table.

   host1(config-if)#ip auto-detect ip-subscriber

4. Configure the primary IP interface to enable dynamic creation of subscriber interfaces.

   host1(config-subif)#ip auto-configure ip-subscriber

5. (Optional) Specify the IP inactivity timer.

   host1(config-subif)#ip inactivity-timer 100

6. (Optional) Specify the source address of traffic that is destined for the primary IP interface.

   host1(config-subif)#ip source-prefix 192.168.2.1 255.255.255.0

Figure 25 shows the interface stack built for this configuration.

Figure 25: GRE Tunnel Dynamic Subscriber Interface Configuration

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