What is the principle and application methods of a route map?
A route_map is a strategic tool used to control route selection and forwarding, based on a sequence of routing policy statements to match and manipulate routes. It can be applied to various routing protocols in Cisco routers, such as BGP, OSPF, and EIGRP.
The principle of a route-map is to classify and manipulate routes based on conditions defined in routing policy statements. It can be used for operations such as filtering, redirecting, modifying, and tagging routes to control and manage network traffic.
The application methods include the following aspects:
- Filtering routes: by matching certain criteria, specific routes can be selectively filtered to prevent their forwarding or learning.
- Redirecting routes: allows certain routes to be redirected to a specific next hop, changing the forwarding path of the packets.
- Modify routing: You can adjust the router ID, metric values, and other attributes to influence the priority and selection of routes.
- Tagging routes: you can add a tag to specific routes for future policy operations or identification.
By properly configuring a route-map, you can control and optimize network traffic, improving the reliability and performance of the network. For example, you can optimize route selection based on traffic type, source address, destination address, and other conditions, distribute traffic to different links, and enhance bandwidth utilization and network quality.
