Hi all, I need to find shortest and best optimal path between two hosts. I dont find any API for that. I found that Dijkstra's algorithm is used in ODL. Can anyone help me to find the REST API call which will return the shortest Path?
You can try to explore the l2-switch code. The loopremover module has the code
related to implementation of Dijkstra algorithm but currently it is disabled.
Thnx subhas,I checked.Its there disabled.And 1.How to create my Own REST api?which calls the Dijkstra's function and return the shortest path. How to do that?
karthik330 ( 2015-09-10 23:45:19 -0800 )edityes ! by modifying l2switch code we can get the shortest path between two hosts !! I got it .
karthik330 ( 2016-03-21 05:48:28 -0800 )editI could get the shortest path between two hosts with ODL topology REST API & Python Networkx module. I used mininet simulator and created a custom network topology with multipath.
From ODL network topology REST api response, extracted hosts, switch & links details. You can even use ODL python client SDK python-odl to get the topology information
GET http://192.168.1.124:8181/restconf/operational/network-topology:network-topology
With the links details, i generated a Graph using python networkx module.
import networkx as nx
graph = nx.Graph()
graph.add_edges_from(graph_links)
Then by using Dijkstra's Algorithm, can find the shortest path between any two hosts in the topology
path = nx.dijkstra_path(graph, source_node, dest_node)
Even we can find the list of shortest paths available for a set of hosts
nx.all_shortest_paths(graph, source=source, target=dest)
Please share your comments on this approach.
Thanks.
Hi @jayaprakash , Good to know that you found the path . I also developed a java application which will find the path between 2 hosts from the topology details. But Now i am trying to do the same as MD-SAL application which will be shown as restconf API
karthik330 ( 2016-02-11 01:19:19 -0800 )editHi @jayaprakash can i have your email to ask some questions ?
yarombeh.toa ( 2017-03-06 02:21:23 -0800 )editHi @jayaprakash, how are you pushing the shortest path information (using your java code) back to the controller?
rajat04 ( 2017-07-15 09:57:48 -0800 )editHi, I think there is no rest api present at odl which will give you shortest path. u need to write application for that by consuming dijkstra's algorithm.
Regards, Ashwini
Hi @Ashwini_Mhatre@subhash , Can you answer for this question? https://ask.opendaylight.org/question/7896/how-to-use-add-repo/
karthik330 ( 2016-02-11 01:22:01 -0800 )editAsked: 2015-09-10 22:11:21 -0800
Seen: 1,373 times
Last updated: Feb 02 '16
