Public bug reported:
As a result from the following bug (br-tun being reset across agent
restarts) https://bugs.launchpad.net/neutron/+bug/1383674
If in addition, we have a broadcast or multicast packet jumping into
br-tun from br-int, openvswitch will bring down the network creating
a broadcast storm.
It's necessary to have at least 3 nodes connected via tunnels:
The packets will go:
NodeA -> NodeB -> NodeC -> NodeA
Or more amplified if we had more nodes.
This would be avoided if we re-created br-tun in fail-mode "secure" at least,
because that doesn't introduce the "NORMAL" default switching rule
on the switch at creation (origin of this problem.)
** Affects: neutron
Importance: Undecided
Assignee: Miguel Angel Ajo (mangelajo)
Status: Confirmed
** Changed in: neutron
Status: New => Confirmed
** Changed in: neutron
Assignee: (unassigned) => Miguel Angel Ajo (mangelajo)
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https://bugs.launchpad.net/bugs/1421232
Title:
Restarting neutron openvswitch while having broadcast/multicast
traffic going into br-tun makes a broadcast storm over the tunnel
network
Status in OpenStack Neutron (virtual network service):
Confirmed
Bug description:
As a result from the following bug (br-tun being reset across agent
restarts) https://bugs.launchpad.net/neutron/+bug/1383674
If in addition, we have a broadcast or multicast packet jumping into
br-tun from br-int, openvswitch will bring down the network creating
a broadcast storm.
It's necessary to have at least 3 nodes connected via tunnels:
The packets will go:
NodeA -> NodeB -> NodeC -> NodeA
Or more amplified if we had more nodes.
This would be avoided if we re-created br-tun in fail-mode "secure" at least,
because that doesn't introduce the "NORMAL" default switching rule
on the switch at creation (origin of this problem.)
To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1421232/+subscriptions
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