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From Kirk Kosinski <>
Subject Re: Shared VLAN allocation for guest network on advanced zone?
Date Tue, 16 Jul 2013 06:17:21 GMT
Shared networks are *only* available in advanced zones.  The UI is
slightly confusing, though.  You cannot create shared networks under the
Network tab, rather you need to create them in Infra > Zones (select the
zone) > Physical Network (select it) > Guest > Network > click Add guest

A shared network can be shared by multiple accounts, but the virtual
router for a shared network does not do any routing; you need to set up
your own router for the VLAN.

Best regards,

On 07/15/2013 08:55 PM, Indra Pramana wrote:
> Hi Kirk,
> Good day to you, and thank you for your e-mail.
> Can I used shared VLAN for guest networks in an advanced zone network
> configuration? I tried to create a new guest network via the Cloudstack
> GUI under Network > Guest networks > Add guest network but I can't add a
> shared guest network. Under the "Network Offering" field, only
> "DefaultIsolatedNetworkOfferingWithSourceNatService" is available to be
> used, despite having a lot of other types of network offerings under
> Service Offerings > Network Offerings.
> Or do I need to switch to basic zone network? I really don't want to
> lose the features which are only available in advanced zone network,
> such as virtual router and firewalls, etc.
> Looking forward to your reply, thank you.
> Cheers.
> On Tue, Jul 16, 2013 at 11:37 AM, Kirk Kosinski <
> <>> wrote:
>     Hi, having isolated networks share VLANs would defeat the purpose of an
>     isolated network.  If the per zone VLAN count is a major concern,
>     consider using shared networks instead.  If you definitely want to use
>     isolated networks, you can add additional zones since guest networks
>     don't go across zones.
>     Be careful when planning VLAN capacity since your switch or even
>     hypervisors may not be able to handle anywhere close to 4096 VLANs.
>     Some switches can only do 10% of that, and it's even less for some
>     hypervisors (e.g. old XenServer versions, and even the latest "only"
>     supports 800 VLANs).  Definitely check with the vendor or docs to find
>     the real versus theoretical maximum.
>     Best regards,
>     Kirk
>     On 07/15/2013 08:07 PM, Indra Pramana wrote:
>     > Dear all,
>     >
>     > It seems that in CloudStack's advanced network zone configuration,
>     we need
>     > to prepare one isolated network VLAN for each guest network for
>     customers.
>     > My concern is that this will severely limit the number of
>     customers we can
>     > have within the zone, since we have a limitation of the number of
>     VLANs we
>     > can create on the switch level. My switch can only support up to 4,096
>     > VLANs maximum.
>     >
>     > Is there a way for us to configure shared VLAN for the users' guest
>     > network? Or is it only available on basic network zone configuration?
>     >
>     > Looking forward to your reply, thank you.
>     >
>     > Cheers.
>     >

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