Re: [Xen-users] 3.4.2 domU networking fails to recover after glitch

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Thu, Dec 3, 2009 at 4:24 PM, Tony Lill <ajlill@xxxxxxxxxxxxxxxxxxx> wrote:
> A couple of times yesterday, my network hiccuped (something funky on
> the switch, a couple of other hosts reported the same thing). While
> the dom0 handled it fine, I could not communicate to any of my
> domUs. using tcpdump on both eth2 and peth2, I could see them send
> packets out, but could not see any of the response packets.
>
> These are the messages that I get around the hiccup
>
> Dec  2 10:52:34 xen kernel: skge peth2: Link is down.
> Dec  2 10:52:34 xen kernel: eth2: port 1(peth2) entering disabled state
> Dec  2 10:52:36 xen kernel: skge peth2: Link is up at 1000 Mbps, full duplex, 
> flow control tx and rx
> Dec  2 10:52:36 xen kernel: eth2: port 1(peth2) entering learning state
> Dec  2 10:52:36 xen kernel: eth2: topology change detected, propagating
> Dec  2 10:52:36 xen kernel: eth2: port 1(peth2) entering forwarding state
>
> I haven't had time to do any serious debugging, but I'm hoping
> someones has seen similar problems.
>
> --
> Tony Lill,                         Tony.Lill@xxxxxxxxxxxxxxxxxxx
> President, A. J. Lill Consultants                 (519) 650 0660
> 539 Grand Valley Dr., Cambridge, Ont. N3H 2S2     (519) 241 2461
> --------------- http://www.ajlc.waterloo.on.ca/ ----------------
>
>
>
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>

Try this:

ip link set dev eth2 up

or

ifconfig eth2 up

In my case the problem happened for a different reason, I had run the
network-bridge script manually to create a second bridge for eth1, but
the physical link (peth1) went down for a while between running the
script and starting a domU, that seemed to cause the bridge to get
stuck in a down state and required the above command to bring it back
up.

I'm not sure if this is intended behaviour, I need to read up on what
is supposed to happen if a physical interface connected to a bridge
goes down..

Andy

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