how do i change ospf route metrics??

[IOS2JunOS]

hello all- I have two Ex4200 switches connected to each other and running ospf. I would like to change metric on few routes when sent from switch1 to switch2 and while keeping default metrics on all other routes. I tired export policy from the  advertising switch but it did not work..then i tried import policy on the receiveing switch..which also did not work. How can i accomplish this. I tried the following policy

policy-statement test-subnets {
    term test-subnets {
        from {
            route-filter 10.1.0.0/23 exact;
            route-filter 10.1.16.0/23 exact;
        }
        then {
            metric 5;
            accept;
        }
    }
    then accept;
}

applied it as export and then also tried it as import on the receving switch...TIA

[Dominik]

Hi,

you must not alter OSPF metrics with the help of policies because that would break the SPF algorithm. The metric is calculated based on the costs of a specific interface by dividing the reference bandwidth (100 MBit) by the interface bandwidth with always rouding up to 1. So Gigabit interfaces get a cost of 1.

In case that these two /23 routes come from directly connected interfaces, you can modify the interface cost (metric) by using this command:

set protocols ospf area x interface ge-a/b/c.0 metric y

You can also modify the reference bandwidth by "set protocols ospf reference-bandwidth".

Regards,

Dominik

[SSHSSH]

Hi  Dominik , but what if he wanted to chage the metric for specific routes ? your method will change metric for all routes

[Dominik]

Hi,

this came also to my mind, but after submitting my post. As he also posted the question under the Routing topic I did not supplement a clarification.

Regards,

Dominik