[ClusterLabs] Can Bonding Cause a Broadcast Storm?

[Eric Robinson]

mode 1. No special switch configuration. spanning tree not enabled. I have 100+ Linux servers, all of which use bonding. The network has been stable for 10 years. No changes recently. However, this is the second time that we have seen high latency and traced it down to the behavior of one particular server. I'm wondering if there is something about bonding that could result in a temporary bridge loop.

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From: Jeremy Voorhis <jvoorhis at gmail.com>
Sent: Tuesday, November 15, 2016 2:13:59 PM
To: Cluster Labs - All topics related to open-source clustering welcomed
Subject: Re: [ClusterLabs] Can Bonding Cause a Broadcast Storm?

What bonding mode are you using? Some modes require additional configuration from the switch to avoid flooding. Also, is spanning tree enabled on the switches?

On Tue, Nov 15, 2016 at 1:26 PM Eric Robinson <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>> wrote:
If a Linux server with bonded interfaces attached to different switches is rebooted, is it possible that a bridge loop could result for a brief period? We noticed that one of our 100 Linux servers became unresponsive and appears to have rebooted. (The cause has not been determined.) A couple of minutes afterwards, we saw a gigantic spike in traffic on all switches in the network that lasted for about 7 minutes, causing latency and packet loss on the network. Everything was still reachable, but slowly. The condition stopped as soon as the Linux server in question became reachable again.

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Eric Robinson


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