OSPF Network Design Solutions
Another purpose of route maps is to enable policy routing. Use the ip policy route-map command, in addition to the route-map command, and the match and set commands to define the conditions for policy routing packets. The related match and set commands are listed in the section “Related Commands for Policy Routing.” The match commands specify the conditions under which policy routing occurs. The set commands specify the routing actions to perform if the criteria enforced by the match commands are met. You might want to policy route packets some way other than the obvious shortest path. Example 1: The following example redistributes all OSPF routes into IGRP: router igrp 109 redistribute ospf 110 default metric 1000 100 255 1 1500 Example 2: The following example redistributes RIP routes with a hop count equal to 1 into OSPF. These routes will be redistributed into OSPF as external LSAs with a metric of 5, metric type of Type 1 and a tag equal to 1: router ospf 109 redistribute rip route-map rip-to-ospf route-map rip-to-ospf permit match metric 1 set metric 5 set metric-type type1 set tag 1 Related Commands for Redistribution:
Related Commands for Policy Routing
router ospf
To configure an OSPF routing process, use the router ospf global configuration command. To terminate an OSPF routing process, use the no form of this command. The syntax for this command (and the no form) is as follows: router ospf process-id no router ospf process-id Syntax Description:
Default: No OSPF routing process is defined. Command Mode: Global configuration. Usage Guidelines: You can specify multiple OSPF routing processes in each router. Example: The following example shows how to configure an OSPF routing process and assign a process number of 109: router ospf 109 Related Commands: network area set level
To indicate where to import routes, use the set level route map configuration command. To delete an entry, use the no form of this command. The syntax for this command (and the no form) is as follows: set level {level-1 | level-2 | level-1-2 | stub-area | backbone} no set level {level-1 | level-2 | level-1-2 | stub-area | backbone} Syntax Description:
set metric
To set the metric value for the destination routing protocol, use the set metric route map configuration command. To return to the default metric value, use the no form of this command. The syntax for this command (and the no form) is as follows: set metric metric-value no set metric metric-value Syntax Description: metric-value. Metric value or IGRP bandwidth in kilobits per second. It can be an integer from -294,967,295 through 294,967,295. Default: Default metric value. Command Mode: Route map configuration. Usage Guidelines: Use the route-map global configuration command, and the match and set route-map configuration commands, to define the conditions for redistributing routes from one routing protocol into another. Each route-map command has a list of match and set commands associated with it. The match commands specify the match criteria—the conditions under which redistribution is allowed for the current route map. The set commands specify the set actions—the particular redistribution actions to perform if the criteria enforced by the match commands are met. The no route-map command deletes the route map. The set route-map configuration commands specify the redistribution set actions to be performed when all of a route map’s match criteria are met. When all match criteria are met, all set actions are performed. Example: In the following example, the metric value for the destination routing protocol is set to 100: route-map set-metric set metric 100 Related Commands:
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