Custom LinkWeigher

[Sergio Vera Martínez]

Hi everyone,

I know there are some past conversations trying to answer why I am going to ask but I still do not understand how it works. By default, link metric is set to 1 unless custom LinkWeigher is past. As far as I know, the LinkWeigher Interface is empty and the LinkWeigherAdapter class has three methods. In my case, I want to set the metric of a given set of links but I do not understand how to set this. Neither in Link nor Edge Interfaces there is method to set the metric (not even to get it). I do not know what is the exact meaning of "Sets the specified link-weight function to be used as a default" in PathAdminService. Thanks in advance.

Best regards

[Pier Luigi Ventre]

Hi Sergio,

You have to provide your implementation of LinkWeigher interface which will set the metric value according to your logic, see an example here:

https://github.com/opennetworkinglab/trellis-control/blob/master/impl/src/main/java/org/onosproject/segmentrouting/SRLinkWeigher.java

Finally, you have to pass the instance of your LinkWeigher to the TopologyService to ask a path computation using that LinkWeigher:

https://github.com/opennetworkinglab/trellis-control/blob/2ec89521d62c646d6ce07deecbaf0846bb9b019b/impl/src/main/java/org/onosproject/segmentrouting/mcast/McastUtils.java#L622

In this way, you will override the default path computation.

Hope - this helps

Pier

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[Sergio Vera Martínez]

Hi,

Thank you so much for your help. Now I have a clear vision of how to do it.

Best regards

El dia dilluns, 23 de novembre de 2020 a les 8:45:34 UTC+1, pi...@opennetworking.org va escriure: