** Also affects: os-vif/stein
Importance: Undecided
Status: New
** Also affects: os-vif/trunk
Importance: High
Assignee: sean mooney (sean-k-mooney)
Status: In Progress
** Changed in: os-vif/stein
Status: New => Confirmed
** Changed in: os-vif/stein
Assignee: (unassigned) => sean mooney (sean-k-mooney)
** Changed in: os-vif/stein
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1837252
Title:
IFLA_BR_AGEING_TIME of 0 causes flooding across bridges
Status in neutron:
Invalid
Status in OpenStack Compute (nova):
Invalid
Status in os-vif:
In Progress
Status in os-vif stein series:
Confirmed
Status in os-vif trunk series:
In Progress
Status in OpenStack Security Advisory:
Incomplete
Bug description:
Release: OpenStack Stein
Driver: LinuxBridge
Using Stein w/ the LinuxBridge mech driver/agent, we have found that
traffic is being flooded across bridges. Using tcpdump inside an
instance, you can see unicast traffic for other instances.
We have confirmed the macs table shows the aging timer set to 0 for
permanent entries, and the bridge is NOT learning new MACs:
root@lab-compute01:~# brctl showmacs brqd0084ac0-f7
port no mac addr is local? ageing timer
5 24:be:05:a3:1f:e1 yes 0.00
5 24:be:05:a3:1f:e1 yes 0.00
1 fe:16:3e:02:62:18 yes 0.00
1 fe:16:3e:02:62:18 yes 0.00
7 fe:16:3e:07:65:47 yes 0.00
7 fe:16:3e:07:65:47 yes 0.00
4 fe:16:3e:1d:d6:33 yes 0.00
4 fe:16:3e:1d:d6:33 yes 0.00
9 fe:16:3e:2b:2f:f0 yes 0.00
9 fe:16:3e:2b:2f:f0 yes 0.00
8 fe:16:3e:3c:42:64 yes 0.00
8 fe:16:3e:3c:42:64 yes 0.00
10 fe:16:3e:5c:a6:6c yes 0.00
10 fe:16:3e:5c:a6:6c yes 0.00
2 fe:16:3e:86:9c:dd yes 0.00
2 fe:16:3e:86:9c:dd yes 0.00
6 fe:16:3e:91:9b:45 yes 0.00
6 fe:16:3e:91:9b:45 yes 0.00
11 fe:16:3e:b3:30:00 yes 0.00
11 fe:16:3e:b3:30:00 yes 0.00
3 fe:16:3e:dc:c3:3e yes 0.00
3 fe:16:3e:dc:c3:3e yes 0.00
root@lab-compute01:~# bridge fdb show | grep brqd0084ac0-f7
01:00:5e:00:00:01 dev brqd0084ac0-f7 self permanent
fe:16:3e:02:62:18 dev tap74af38f9-2e master brqd0084ac0-f7 permanent
fe:16:3e:02:62:18 dev tap74af38f9-2e vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:86:9c:dd dev tapb00b3c18-b3 master brqd0084ac0-f7 permanent
fe:16:3e:86:9c:dd dev tapb00b3c18-b3 vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:dc:c3:3e dev tap7284d235-2b master brqd0084ac0-f7 permanent
fe:16:3e:dc:c3:3e dev tap7284d235-2b vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:1d:d6:33 dev tapbeb9441a-99 vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:1d:d6:33 dev tapbeb9441a-99 master brqd0084ac0-f7 permanent
24:be:05:a3:1f:e1 dev eno1.102 vlan 1 master brqd0084ac0-f7 permanent
24:be:05:a3:1f:e1 dev eno1.102 master brqd0084ac0-f7 permanent
fe:16:3e:91:9b:45 dev tapc8ad2cec-90 master brqd0084ac0-f7 permanent
fe:16:3e:91:9b:45 dev tapc8ad2cec-90 vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:07:65:47 dev tap86e2c412-24 master brqd0084ac0-f7 permanent
fe:16:3e:07:65:47 dev tap86e2c412-24 vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:3c:42:64 dev tap37bcb70e-9e master brqd0084ac0-f7 permanent
fe:16:3e:3c:42:64 dev tap37bcb70e-9e vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:2b:2f:f0 dev tap40f6be7c-2d vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:2b:2f:f0 dev tap40f6be7c-2d master brqd0084ac0-f7 permanent
fe:16:3e:b3:30:00 dev tap6548bacb-c0 vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:b3:30:00 dev tap6548bacb-c0 master brqd0084ac0-f7 permanent
fe:16:3e:5c:a6:6c dev tap61107236-1e vlan 1 master brqd0084ac0-f7 permanent
fe:16:3e:5c:a6:6c dev tap61107236-1e master brqd0084ac0-f7 permanent
The ageing time for the bridge is set to 0:
root@lab-compute01:~# brctl showstp brqd0084ac0-f7
brqd0084ac0-f7
bridge id 8000.24be05a31fe1
designated root 8000.24be05a31fe1
root port 0 path cost 0
max age 20.00 bridge max age 20.00
hello time 2.00 bridge hello time 2.00
forward delay 0.00 bridge forward delay
0.00
ageing time 0.00
hello timer 0.00 tcn timer 0.00
topology change timer 0.00 gc timer
0.00
flags
The default ageing time of 300 is being overridden by the value set
here:
Stein: https://github.com/openstack/os-
vif/blob/stable/stein/os_vif/internal/command/ip/linux/impl_pyroute2.py#L89
Master: https://github.com/openstack/os-
vif/blob/master/os_vif/internal/ip/linux/impl_pyroute2.py#L89
I am not sure of the behavior in OVS environments using the iptables
firewall, but I have confirmed the 'qbr' bridges also have a ageing
time of 0 (formerly 300).
Please let me know if you have any questions.
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