Ingress Traffic Being Flooded Unexpectedly for Instances on Provider Network

Problem

Virtual machines (VMs) residing on a provider, VLAN-based network are receiving traffic not directed to them – resulting in increased overhead and performance degradation.

Example:

root@odr1:~# ip addr...2: ens3: [BROADCAST,MULTICAST,UP,LOWER_UP] mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether fa:16:3e:53:88:d1 brd ff:ff:ff:ff:ff:ffinet 10.200.3.74/16 brd 10.200.255.255 scope global ens3valid_lft forever preferred_lft foreverroot@odr1:~# tcpdump -eni ens3 'ip and not host 10.200.3.74'tcpdump: verbose output suppressed, use -v or -vv for full protocol decodelistening on ens3, link-type EN10MB (Ethernet), capture size 262144 bytes15:47:15.433385 fa:16:3e:b9:3a:e7 > fa:16:3e:44:37:2e, ethertype IPv4 (0x0800), length 46: 92.xxx.xxx.x > 10.200.4.217: ICMP echo request, id 39603, seq 1, length 1215:47:16.392894 fa:16:3e:b9:3a:e7 > fa:16:3e:44:37:2e, ethertype IPv4 (0x0800), length 46: 167.xxx.xx.x > 10.200.4.217: ICMP echo request, id 14148, seq 1, length 12...15:47:18.871963 fa:16:3e:b9:3a:e7 > fa:16:3e:fe:e0:55, ethertype IPv4 (0x0800), length 46: 92.xxx.xxx.x > 10.200.1.221: ICMP echo request, id 19140, seq 1, length 1215:47:20.637640 fa:16:3e:b9:3a:e7 > fa:16:3e:fe:e0:55, ethertype IPv4 (0x0800), length 46: 92.xxx.xxx.x > 10.200.1.221: ICMP echo request, id 55584, seq 1, length 12

Environment

  • Platform9 Managed OpenStack - v4.0 – v4.3

  • Neutron

  • OVS

  • VLAN – Provider Network

Cause

Resolution

The related bug has been addressed upstream and Platform9 has backported to all affected PMO versions.

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Ingress Traffic Being Flooded Unexpectedly for Instances on Provider NetworkProblemEnvironmentCauseResolution