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arp requests from compute nodes bogging network

asked 2014-09-12 12:14:40 -0500

ram5391 gravatar image

My openstack installation is semi-down at the moment due to high network traffic. Upon doing a TCPDUMP from the head-node, I get the following:

15:47:01.732351 IP node-32 > node-20: GREv0, key=0x4, length 50: ARP, Request who-has 192.168.1.2 tell  192.168.1.1, length 28
15:47:01.732378 IP node-32 > node-20: GREv0, key=0x4, length 50: ARP, Request who-has 192.168.1.2 tell 192.168.1.1, length 28
15:47:01.732419 IP node-19 > node-20: GREv0, key=0x4, length 50: ARP, Request who-has 192.168.1.2 tell 192.168.1.1, length 28
15:47:01.732422 IP node-19 > node-20: GREv0, key=0x4, length 50: ARP, Request who-has 192.168.1.2 tell 192.168.1.1, length 28
15:47:01.732506 IP node-19 > node-20: GREv0, key=0x4, length 50: ARP, Request who-has 192.168.1.2 tell 192.168.1.1, length 28
15:47:01.732509 IP node-19 > node-20: GREv0, key=0x4, length 50: ARP, Request who-has 192.168.1.2 tell 192.168.1.1, length 28

The network is saturated (about 1,800,000 packets in 5 seconds) with this kind of traffic. Can someone please help me diagnose what is going on?

I'm using neutron with GRE tunneling. I'm also using a ceph backend.

Thanks

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answered 2014-09-27 12:28:58 -0500

edmv gravatar image

This happened to me once, I think it happened after reconfiguring some of the neutron agents, don't remember exactly but in any case the problem was solved by restarting openvswitch and neutron-openvswitch-agent on the machines generating the traffic

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Asked: 2014-09-12 12:12:20 -0500

Seen: 504 times

Last updated: Sep 27 '14