Advanced Networking : OSPF
 
OSPF
OSPF (Open Shortest Path First) is described in RFC2328, OSPF Version 2. It is a link-state interior routing protocol. Compared with RIP, OSPF can provide scalable network support and faster convergence times. OSPF is widely used in large networks such as ISP backbone and enterprise networks. FortiADC supports OSPF version 2.
Before you begin:
• You must know how OSPF has been implemented in your network, and you must know the configuration details of the implementation.
• You must have Read-Write permission for System settings.
To configure OSPF:
1. Go to Networking > Routing.
2. Click the OSPF tab.
3. Click Add to display the configuration editor.
4. Complete the configuration as described in Table 92.
5. Save the configuration.
 
Table 92: OSPF configuration
Settings
Guidelines
Router ID
32-bit number that identifies the router. The router ID uses dotted decimal notation. sets the router-ID of the OSPF process. The router-ID must be an IP address of the router, and it must be unique within the entire OSPF domain to the OSPF speaker.
Default Information Originate
• Enable—Originate an AS-External (type-5) LSA describing a default route into all external routing capable areas of the specified metric and metric type.
• Always—The default is always advertised, even when there is no default present in the routing table.
• Disable
Default Information Metric
The default is -1.
Default Information Metric Type
• 1
• 2
Default Metric
The default is 10.
Distance
The default is 110.
Redistribute Connected
Enable/disable to redistribute connected routes into OSPF, with the metric type and metric set if specified. Redistributed routes are distributed into OSPF as Type-5 External LSAs into links to areas.
Redistribute Static
Enable/disable to redistribute static routes into OSPF, with the metric type and metric set if specified. Redistributed routes are distributed into OSPF as Type-5 External LSAs into links to areas.
Networking
Prefix
Address/mask notation to specify the subnet.
Area
32-bit number that identifies the OSPF area. An OSPF area is a smaller part of the larger OSPF AS. Areas are used to limit the link-state updates that are sent out. The flooding used for these updates would overwhelm a large network, so it is divided into these smaller areas for manageability.
OSPF Interface
Name
Unique name. No spaces or special characters.
After you initially save the configuration, you cannot edit the name.
Interface
Select the interface to enable OSPF for it.
MTU Ignore
Enable/disable to ignore the interface MTU. Disabled by default.
Network Type
• Broadcast
• Point to Point
• Point to Multipoint
Retransmit Interval
Interval for retransmitting Database Description and Link State Request packets. The default is 5 seconds.
Transmit Delay
Increment LSA age by this value when transmitting. The default is 1 second.
Cost
Set link cost for the specified interface. The cost value is set to router-LSA's metric field and used for SPF calculation. The default is 0.
Priority
The router with the highest priority will be more eligible to become Designated Router. Setting the value to 0 makes the router ineligible to become Designated Router. The default is 1.
Dead Interval
Number of seconds for RouterDeadInterval timer value used for Wait Timer and Inactivity Timer. This value must be the same for all routers attached to a common network. The default is 40 seconds.
Hello Interval
Number of seconds between hello packets sent on the configured interface. This value must be the same for all routers attached to a common network. The default is 10 seconds.