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Lithium l2switch removes links between switch after 900 hosts/50 mins.

asked 2015-09-30 21:55:15 -0700

HI, I am running three switch topology s1 s2 and s3 with 1000 hosts on s1 side and 1 host on s3 side. My topology is linear. I am making communication between 1000 hosts and 1 host which is connected with s3 switch using IPERF. I was having target to 1000 clients one by one but when I reach till 900 approx lithium removes the link between switches and further host is not able to communicate. Further observation are, a)After 900 hosts suddenly link removes come on ODL logs. b)Network graph becomes null.

Thank you so much in advance Devesh

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answered 2015-10-28 09:48:03 -0700

aanm gravatar image

Can you provide more logs? I had issues in the past with mininet when a large amount of connections were on. Thanks

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answered 2015-10-28 13:28:13 -0700

This seems like mininet issue as suggested above. L2switch is just reacting to an event received from switch that the link/port is down. Link removal would happen only in case of loops ideally.

Other possibility is loss of lldp flow issue. Things to check is if the s1, s2, s3 still have the original lldp flows installed then the controller code is not initiating this link drop. It could be mininet which is running out of resources at that time?

This is just a thought based on information provided.

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Asked: 2015-09-30 21:55:15 -0700

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Last updated: Oct 28 '15