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Is the network node also acting as a Compute node ?
The issue you were mentioning was related to the tap virtual device (for 
DHCP leases) : if the network node goes down, then the DHCP lease is 
expiring on the vm without being reack, and then your instance is 
loosing its IP address.
By recreating the bridges upon reboot on the network node, the tap 
interface will be back up. On the VMs, only a DHCP request is enough, 
not a reboot (or even a compute node reboot).

I know there is also a second bug related to virtio bridges on the 
compute nodes. This is still a bit unclear to me, but upon compute node 
reboot, virtio bridges are also not reattached, only new instances 
created afterwards.

Could you please run 'ovs-dpctl show br-int' (provided br-int is the 
right bridge), 'ovs-vsctl show' and 'brctl show' ?

Le 01/03/2013 21:28, The King in Yellow a écrit :
> On Fri, Mar 1, 2013 at 10:11 AM, Sylvain Bauza 
> <sylvain.bauza at digimind.com <mailto:sylvain.bauza at digimind.com>> wrote:
>
>     There is a known bug for the network bridges, when rebooting :
>     https://bugs.launchpad.net/quantum/+bug/1091605
>
>     Try to delete/recreate your br-int/br-ex and then restart
>     openvswitch_plugin/l3/dhcp agents, it should fix the issue.
>
>
> Thanks!  Now, I can create a new instance, and that works.  My 
> previous instances don't work, however.  What do I need to do to get 
> them reattached?
>
>
> root at os-network:/var/log/quantum# ping 10.5.5.6
> PING 10.5.5.6 (10.5.5.6) 56(84) bytes of data.
> ^C
> --- 10.5.5.6 ping statistics ---
> 2 packets transmitted, 0 received, 100% packet loss, time 1008ms
>
> root at os-network:/var/log/quantum# ping 10.5.5.7
> PING 10.5.5.7 (10.5.5.7) 56(84) bytes of data.
> 64 bytes from 10.5.5.7 <http://10.5.5.7>: icmp_req=1 ttl=64 time=2.13 ms
> 64 bytes from 10.5.5.7 <http://10.5.5.7>: icmp_req=2 ttl=64 time=1.69 ms
> 64 bytes from 10.5.5.7 <http://10.5.5.7>: icmp_req=3 ttl=64 time=1.93 ms
> 64 bytes from 10.5.5.7 <http://10.5.5.7>: icmp_req=4 ttl=64 time=1.01 ms
> ^C
> --- 10.5.5.7 ping statistics ---
> 4 packets transmitted, 4 received, 0% packet loss, time 3003ms
> rtt min/avg/max/mdev = 1.013/1.692/2.132/0.424 ms
> root at os-network:/var/log/quantum#

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