Step 1: Access the SRX Device

Log into the SRX device using the CLI (Command Line Interface). You can do this via SSH, console, or any other method you use to access the device.

Step 2: Enter Configuration Mode

Once logged in, enter the configuration mode:

cli
configure

Step 3: Enable OSPF Routing Protocol

You need to enable OSPF globally on the SRX device. Here’s how you can do it:

set routing-options autonomous-system <AS_NUMBER>

• <AS_NUMBER> is the Autonomous System number. This should be a unique value assigned to the OSPF domain you're configuring.

Step 4: Configure OSPF Interfaces

Next, configure the interfaces that will participate in OSPF. You can configure OSPF on specific interfaces or all interfaces depending on your network setup.

Example to configure OSPF on a specific interface:

set interfaces <INTERFACE_NAME> unit 0 family inet address <IP_ADDRESS>/<SUBNET_MASK>
set protocols ospf area 0.0.0.0 interface <INTERFACE_NAME>

• <INTERFACE_NAME> is the name of the interface (for example, ge-0/0/0).
• <IP_ADDRESS> is the IP address of the interface.
• <SUBNET_MASK> is the subnet mask.
• area 0.0.0.0 refers to OSPF Area 0 (which is typically used for backbone networks).

If you want to include multiple interfaces, repeat the above command for each interface.

Step 5: Configure OSPF Area

OSPF divides networks into different areas. You can configure multiple OSPF areas depending on your network topology.

For instance, if you have multiple areas, you can configure them as follows:

set protocols ospf area 0.0.0.0 interface <INTERFACE_NAME>
set protocols ospf area 0.0.0.0 interface <SECOND_INTERFACE_NAME>

If you want to enable a different area, just change the area identifier.

Step 6: Configure OSPF Router ID (Optional)

If you don’t explicitly set a router ID, OSPF will automatically assign one. However, you can manually set the router ID for OSPF:

set protocols ospf router-id <ROUTER_ID>

The router ID is typically an IP address that uniquely identifies the router within the OSPF network. The router ID should be within the same network range as the interfaces participating in OSPF.

Step 7: Commit the Configuration

Once you’ve finished configuring OSPF, commit the configuration to apply the changes:

commit

Step 8: Verify the OSPF Configuration

After the commit, verify that OSPF is running properly with the following commands:

• Check OSPF neighbors:

  show ospf neighbor
  

• Check OSPF routes:

  show ospf route
  

• Check the OSPF configuration:

  show configuration protocols ospf
  

• Check OSPF interface information:

  show ospf interface
  

Example Configuration

Here's an example of a basic OSPF configuration on a Juniper SRX device:

set routing-options autonomous-system 65000
set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24
set interfaces ge-0/0/1 unit 0 family inet address 192.168.2.1/24
set protocols ospf area 0.0.0.0 interface ge-0/0/0
set protocols ospf area 0.0.0.0 interface ge-0/0/1
set protocols ospf router-id 192.168.1.1