[ovs-discuss] Adding a new vlan will caused the host lost connection

[Kris zhang]

I found the reason, the problem is not caused by vlan splinters, it caused
by bond0. I don't know why, but if remove the bond0, and ovs-br0 directly
connect to eth0, the problem disappears.




On Mon, May 27, 2013 at 10:10 AM, Kris zhang <zhang.kris at gmail.com> wrote:

> Hi Jesse,
>
> Because if i don't use the vlan splinters, the VMs' network traffic will
> be nearly 0 M/s (but they can ping each other). I read FAQ, it says the
> reason maybe the NIC driver or Linux kernel version problems, and it also
> says the vlan splinters may solve this issue, but they don't said the ping
> will miss some packets when add a new vlan. is it a bug for vlan splinters?
> Please see the images in the attachment.
>
> Thanks,
> Kris
>
>
> On Thu, May 23, 2013 at 11:25 PM, Jesse Gross <jesse at nicira.com> wrote:
>
>> It seems that the original issue was that you were using VLANs when
>> you shouldn't have. In that case, why are you trying to use VLAN
>> splinters?
>>
>> On Thu, May 23, 2013 at 2:44 AM, Kris zhang <zhang.kris at gmail.com> wrote:
>> > Thanks Jesse, but i still cannot fix my issue. Because if i use vlan
>> > splinters, the above issue will be happened, if i don't use vlan
>> splinters,
>> > the packets between the VMs are very slow (ping is ok), i use ovs-dpctl
>> > dump-flows br0, get the following result:
>> >
>> >
>> in_port(1),eth(src=c6:b0:ea:37:29:47,dst=c6:b0:3a:c0:0d:55),eth_type(0x8100),vlan(vid=3000,pcp=0),encap(eth_type(0x0800),ipv4(src=20.1.120.12,dst=20.1.120.13,proto=1,tos=1,ttl=64,frag=no),icmp(type=8,code=0)),
>> > packets:101, bytes:10302, used:4.341s, actions=pop_vlan,3
>> >
>> in_port(3),eth(src=c6:b0:3a:c0:0d:55,dst=c6:b0:ea:37:29:47),eth_type(0x0800),ipv4(src=20.1.120.13,dst=20.1.120.12,proto=1,tos=0,ttl=64,frag=no),icmp(type=0,code=0)),
>> > packets:101, bytes:9898, used:4.341s,
>> actions=push_vlan(vid=3000,pcp=0),1
>> >
>> > The port 1 is eth1, and the port 3 is the tap of VM.
>> > Does the iptables affect the ovs? If not, i have to upgrade the linux
>> > kernel, or upgrade NIC driver.
>> >
>> > Thanks,
>> > Kris
>> >
>> >
>> >
>> >
>> > On Tue, May 21, 2013 at 3:32 AM, Jesse Gross <jesse at nicira.com> wrote:
>> >>
>> >> There's an extensive section in the FAQ about vlans that I would
>> >> recommend reading.
>> >>
>> >> On Mon, May 20, 2013 at 8:51 AM, Kris zhang <zhang.kris at gmail.com>
>> wrote:
>> >> > No, so you mean it maybe not caused by vlan splinters?
>> >> >
>> >> >
>> >> > On Mon, May 20, 2013 at 11:18 PM, Jesse Gross <jesse at nicira.com>
>> wrote:
>> >> >>
>> >> >> On Mon, May 20, 2013 at 4:37 AM, Kris zhang <zhang.kris at gmail.com>
>> >> >> wrote:
>> >> >> > Hi guys,
>> >> >> >
>> >> >> > I use ovs-1.7.1, and i run ovs on a single NIC host (CentOS):
>> >> >> >
>> >> >> > # ovs-vsctl add-br br0
>> >> >> > # ovs-vsctl add-port br0 eth0
>> >> >> >
>> >> >> > Then i setup the eth0 interface's other_config:
>> >> >> > enable-vlan-splinters="true".
>> >> >> >
>> >> >> > Last I ping this host by another PC, and at same time i do this:
>> >> >> >
>> >> >> > # ovs-vsctl add-port taptest br0 tag=100
>> >> >> >
>> >> >> > I found there are 4 "Request timed out." happened. That means the
>> >> >> > host
>> >> >> > lost
>> >> >> > connect about 4 seconds.
>> >> >> >
>> >> >> > If i remove the vlan splinters on interface eth0. it won't happen.
>> >> >> > So does anybody know the reason?
>> >> >>
>> >> >> Is the other machine actually on that VLAN?
>> >> >
>> >> >
>> >
>> >
>>
>
>
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