Adjusting OSPF Route Selection

By adjusting OSPF route selection, you can enable OSPF to meet the requirements of complex networks.

Usage Scenario

In real world situations, you can configure an OSPF route selection rule by setting OSPF route attributes to meet the requirements of complex networks.

Set the cost of an interface. The link connected to the interface with a smaller cost value preferentially transmits routing information.
Configure equal-cost routes to implement load balancing.
Configure a stub router during the maintenance operations such as upgrade to ensure stable data transmission through key routes.
Suppress interfaces from sending or receiving packets to help select the optimal route.
Configuring an OSPF interface to automatically adjust the link cost based on link quality that facilitates route selection control and improves network reliability.

Pre-configuration Tasks

Before adjusting OSPF route selection, complete the following tasks:

Configure IP addresses for interfaces to ensure that neighboring nodes are reachable at the network layer.
Configure basic OSPF functions.

Setting the Interface Cost: You can adjust and optimize route selection by setting the OSPF interface cost.

Configuring Equal-Cost Routes: You can set the number of OSPF equal-cost routes and route preference to implement load balancing and adjust route selection.

Setting the convergence priority for OSPF routes: You can adjust and optimize route selection by setting the convergence priority for OSPF routes.

Configuring a Stub Router: To ensure that a route is not interrupted during flapping-triggering maintenance operations such as upgrade, you can configure a router as a stub router to allow traffic to bypass the route on the stub router.

Suppressing an Interface from Receiving and Sending OSPF Packets: After an interface is suppressed from receiving and sending OSPF packets, routing information can bypass a specific router and the local router can reject routing information advertised by another router.

Configuring an OSPF Interface to Automatically Adjust the Link Cost: Configuring an OSPF interface to automatically adjust the link cost based on link quality facilitates route selection control and improves network reliability.

Configuring a Fallback Cost for an Eth-Trunk Interface: A fallback cost of an Eth-Trunk interface helps adjust route selection dynamically.

Verifying the Configuration of OSPF Route Selection: After OSPF route selection is adjusted, you can check OSPF routing table and interface information.