[LiSA-Users] Regarding LiSA trunk mode

[chicany]

*I've managed to replicate Ammar's topology and reproduce the problem. I
can confirm that the problem is actually caused by hardware VLAN untagging.
But the problem is that I have no idea how to change the NIC type for GNS3
VirtualBox guests. All NIC settings in VirtualBox are overwritten by GNS3
at the time when it starts the virtual machines. I couldn't find any NIC
type setting in the GNS3 interface.
*
Drag  Vbox guest from the left panel  and drop it on GNS3 desktop. Left
click on Vbox guest and select *Configure. *Now you select  NIC type for
particular VBox guest*. *
*Another option is to edit a configuration file - topology.net. *You can
find parameters as number of NICs and its type there*.

*
I successfully tested trunking between two LiSA instances emulated by QEMU
on GNS3. I used i82557b eth card type*. *Change of MAC for VLAN interface
was required in order to get it working.***
*


2013/6/4 Radu Rendec <radu.rendec at mindbit.ro>

> **
> Hi,
>
> Actually there are 2 distinct issues.
>
> The first issue is related to distinct LiSA instances having the same mac
> address on their virtual interfaces. But this should only affect scenarios
> where "layer 3" functionality is involved: creating virtual interfaces with
> "interface vlan NNN" and then assigning IP addresses.
>
> The second issue is related to hardware acceleration of VLAN untagging.
> When the NIC supports such acceleration, frames are already untagged at the
> time when they come out of the NIC driver. Because right now there is no
> support for this in LiSA, it can't properly handle these frames and they
> get "lost". Since centos 6.3 has no support for "rxvlan" in ethtool
> (actually there is no kernel support for this in 2.6.32), the workaround
> for this is to use another type of NIC, which doesn't support hardware
> acceleration of VLAN untagging.
>
> I've managed to replicate Ammar's topology and reproduce the problem. I
> can confirm that the problem is actually caused by hardware VLAN untagging.
> But the problem is that I have no idea how to change the NIC type for GNS3
> VirtualBox guests. All NIC settings in VirtualBox are overwritten by GNS3
> at the time when it starts the virtual machines. I couldn't find any NIC
> type setting in the GNS3 interface.
>
> Cheers,
>
> Radu
>
> On Wed, 2013-05-29 at 23:52 -0400, chicany wrote:
>
> Hi,
>
>  a few weeks ago I noticed a similar problem with non working trunk
> between two LiSA switches running on GNS3 with Qemu installed. The problem
> was that for each VLAN interface the same MAC address was generated on
> LiSA. The problem and workaround is described here (17 c):
>
>
> http://brezular.wordpress.com/2010/09/25/lisa/
> http://forum.gns3.net/topic5647.html
>
>
>  Cheers
>
>
>
>  2013/5/28 Radu Rendec <radu.rendec at mindbit.ro>
>
> Hi Ammar,
>
> The "show vlan" command only lists interfaces that are configured in
> access mode for each vlan. This is normal behaviour.
>
> Regarding your trunk problem, can you please send me a screenshot of
> your test topology and the output of "show runnning-config" from the
> lisa cli?
>
> One more thing: please post questions like this to the lisa-users
> mailing list. We don't have a (large) community, but we're trying to
> build one :)
>
> Thanks,
>
> Radu
>
> On Tue, 2013-05-28 at 09:35 +0800, ammar al-jubari wrote:
> > Dear Mr. Radu
> >
> >
> > First I would like to thank you for supporting Lisa. If you allow me,
> > I have a question regarding LiSA in GNS3.  I have built 2 LiSA
> > switches and 4PCs topology in gns3 and virtual Box. It is working well
> > if all the ports are in access mode. I tried to make a trunk link
> > between 2 liSA, but it is not working. I used the following commands
> > to do that in the interface eth0 of both LiSA switches
> > switchport trunk allowed vlan 5
> > switchport mode trunk
> >
> >
> > I noticed that when I show the VLAN table this port does not appear in
> > the list. When I changed it to access mode it appeared in the list and
> > it  is working well.
> >
> >
> > Can you please help me with that or give me any suggestion to solve
> > this problem?
> >
> >
> > I really appreciate your cooperation
> >
> >
> >
> >
> > Regards
> >
> >
> > Ammar
> >
> >
>
>
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