[Users] Same VLAN id, for different physical networks.

[Lior Vernia]

Hello Alfred,

While having two networks with the same VLAN tag in the same DC makes
sense, it is not currently supported in oVirt (though this issue has
been raised before and it might be supported in future versions).

For the time being, you might be able to first add the network as
non-VLAN, and then force-tag it via the database. I'm not sure this
would work (you might get stuck on some validation somewhere else), but
it might be worth a shot.

Yours, Lior.

On 10/06/13 22:21, Alfred Angelov wrote:
> Hey,
> 
> I might not have been clear on the description, let me try to be more
> clear:
> 
> I got three physically different networks:
> - access network (gives internet access and has routes etc)
> - backup network (is an internal network without routing)
> - storage network (is used for ovirtmngt and connection to a storage
> sollution)
> 
> Both networks have separate switches and and cables, etc; but for
> simplicity’s
> sake I use same VLAN IDs on both of them for those VPSses/Servers that have
> a VLAN.
> 
> In ovirt I have different NICs for those two networks; it looks
> something like this:
> - NIC1 - access network untagged
> - NIC2 - access network VLANs (this actually a bonded interface of two
> NICs so it provides
> redundancy - this works fine)
> - NIC3 - backup network untagged
> - NIC4 - backup network VLANs (this is not bonded, as it does not need
> redundancy)
> - NIC5/6 - storage network (which is also a bonded interface that is
> also the ovirtmngmt network)
> 
> I run the same network setup on all the hosts (currently 4).
> 
> As said NIC2 and NIC4 are used for VLANS, so when I wanted to add VLAN 4
> for the access and
> backup network I have gotten the error:
> 
>> Error: The specified VLAN ID (4) is already in use.
> 
> I hope this makes things more clear?
> 
> Mvh
> Alfred Angelov
> 
> 
> On 06/10/2013 08:02 PM, Itamar Heim wrote:
>> On 06/10/2013 04:48 PM, Alfred Angelov wrote:
>>> Hey,
>>>
>>> in my ovirt datacenter, I have two physical networks (one I use for
>>> access, and one is internal for runing backups etc). They have different
>>> IP addresses, but are created with same VLAN ids on both physical
>>> networks.
>>>
>>> When I try to add those two networks in ovirt i get a (when I try to add
>>> a VLAN with id 4):
>>>
>>> Error: The specified VLAN ID (4) is already in use.
>>>
>>> Anyone had simmilar issues and is there a way to fix this?
>>>
>>
>> may i ask about the use case of using two interfaces on same vlan?
>> I assume they are connected to same switch?
>> (it means probably outbound routing goes only via one of the two
>> interfaces?)
> 
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