Re: [Xen-users] bonding + VLANs -> Oops/panic, no VLAN on 100 Mbit cards [SOLVED]

["Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx>]

Tomasz Chmielewski wrote:
> As the issue concerns both the -user (configuration) and -devel
> (OOPS), I'm sending this message to both lists.
>
> Some time ago I complained about two problems:
>
> - VLANs are not working on machines with 100 Mbit cards
> - I get a kernel Oops (sometimes panic) when I try to use bonding and
> VLANs with Xen
>
>
> The root of the issue is the same in both cases: VLAN interfaces must
> *not* be brought up before we start our Xen network scripts.
>
And why not?
I've been using vlan interfaces with xen since the days of xen-2.
Then again, I don't use xend's network-bridge to create xenbr0. I use
RedHat's network config to craete the necessary vlans and assign each to
their own bridge.

>
> So have four cases with Xen:
>
> 1. Bonding + VLAN leads to an Oops
> 2. Bonding + VLAN works
>
I haven't been able to get bonding to work reliably though,
I doubt it would work as expected anyway, since the only way to get
bonding and vlan in domU is to detect line status (which would be rather
useless if the network problem happens anywhere other than the switch).
> 3. VLANs don't work with 100 Mbit cards
> 4. VLANs work with 100 Mbit cards
>
In my experince the problem comes from network card drivers. Some
boradcom network cards on Dell servers wouldn't work with xen-3.0.2 (or
to be more specific, the kernel that comes with xen-3.0.2) but works
with xen-3.0.4.
> I use network-bridge script shipped with Xen 3.1.
>
My advice :
- Dont't use network-bridge script. Change the entry on xend-config.sxp
from network-bridge to /bin/true
- Don't use bonding in dom0
- It will help A LOT if you have at least two interfaces on dom0: one
for dom0 management, one (or more) for domU's traffic.
- Create vlans and bridges in dom0 using your distro's network config.
- If you need bonding and have more than two dom0 interface handling
domU's traffic, do the bonding in domU.

Regards,

Fajar

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